Machline General Catalog by NTN Bearing Corporation of America

MachLine : the perfect solution for your machine tools 速

Industry

Our expertise made available for your machine tools

Contents Everything there is to know 4 >10 about MachLine速 > MachLine: meeting every challenge for machine tool spindles > Research & Development > The range

6 7 8-10

General technical details

11 > 36

> Preloading, definition of symbols > Rigidity, axial deflection > Influence of an external axial load > Speed correction factor > Spindle design > Lubrication > Selection guide > Ceramic ball bearings (CH) > High speed bearings (ML) > Sealed bearings (MLE) > HNS bearings (N) > Assembly examples

12-14 15 16 17 18-24 25-27 28-29 30-31 32 33 34 35-36

MachLine速 range

37 > 60

> > > > >

38-39 40-51 52-54 55 56-60

Symbols, labelling and packaging MachLine: the ranges Precision self-locking nuts Summary of the ranges Tolerances and precision classes

Maintenance and services

61 >68

> > > >

62 63-66 67 68

Storage Assembly Vibratory analysis Expert analysis, training

Precision, speed, quality: the best of all worlds

SNR's engineers, through their partnership in ambitious projects such as Ariane 5 and the Airbus A380, have been working for forty years to meet the toughest technical challenges, with extremely high quality requirements. They have drawn on all their expertise to satisfy strict specifications and to operate in extraordinary speed and temperature conditions. On the basis of its experience in these conditions, SNR can now offer you the very best of its know-how for your machine tools. This is our manufacturing philosophy, and our MachLine bearings are the result. "Programmed" to guarantee you outstanding precision, performance and long life.

SNR is part of the history of bearings... and is building their future SNR is a major player on the European and worldwide stage, and has consistently remained committed to innovation in product design and manufacturing. Its process management operations compliment a sales presence in more than 200 countries. However, SNR is also closely associated with the development of mechatronics. The company was in the vanguard of mechatronics pioneers, developing a specific competence working with customers in the three major markets of automotive, aerospace and industry.

Precision benefits from good organization Very high precision bearings such as MachLine are designed, manufactured and tested by our aeronautics division which by its very nature, must have a â&#x20AC;&#x153;zero toleranceâ&#x20AC;? organizational structure, when it comes to defects.

Quality: the safest bearings... and the most environmentally friendly MachLine bearings comply with the most stringent standards in terms of manufacturing quality and environmental protection, with ISO 9001-V2000, EN 9100 and ISO 14001 accreditation.

Everything there is to know about ® MachLine

• MachLine: meeting every challenge for machine tool spindles

been accounted for in SNR's R&D?

• Research & Development

What product families make up the MachLine

• The range

How have machine tool-specific requirements

range? What are their general characteristics? Find the answers to these questions and more over the next few pages…

8-10

MachLine®: meeting every challenge for machine tool spindles

Faster, cleaner, longer lasting: today's bearings need to be adapted to the reality of machining in today's world. High speed machining, reduction of downtime, greater rigidity and integrated sealing… Machines are achieving ever increasing performance levels requiring productivity and environmental considerations to be considered. The MachLine range has specific solutions for all these points.

The challenge of reliability

The challenge of speed

The MachLine range offers a selection of new inno-

Machining time is money. The quicker a machine

vative products so that you no longer have to choose

works, the more productive it is. To achieve higher

between machining speed and load capacity. In

performance, bearings must be able to accomodate

addition, precision self-locking nuts are offered to

extremely high speeds – and this is why the ML

ensure proper assembly. These products enhance

range was designed.

the "standard" high precision ranges which are still available and displayed in this catalog:

The challenge of simplicity

• MachLine High Precision: Standard

A user's life is made easier if no periodic greasing is required: the MLE range of sealed bearings are

• MachLine ML: High Speed

lubricated for life.

• MachLine CH: Hybrid • MachLine MLE: Sealed bearings • MachLine N: HNS • Precision self-locking nuts

Enhanced performance with ceramic balls:

x3 +30% +10%

times longer life faster more rigid

All MachLine range bearings are manufactured with a radial run-out whose precision meets ISO2 (ABEC 9) standards (Precision P4S).

SNR R&D: high performance for your machine tools The research that SNR has put into the MachLine range covers all performancerelated areas, from materials to bearing geometry and complementary functions. - Steel: Defects due to steel quality are extremely rare on MachLine bearings because SNR uses total procurement management and traceability systems for its products throughout the world. This guarantees

New packaging

- La simulation des dĂŠfaillances: available from 2006

high purity, the secret for long bearing life.

- Defect simulation:

- Lubrication and sealing: SNR has developed "life-long" lubrication solutions,

In this area, SNR's test center is particularly effective

including LubSolid, which is a solution specially

and has many years of experience. MachLine has

designed for certain industrial applications. It has

undergone a vast array of tests and undergone

been one of SNR's major research areas for MachLine,

numerous simulations and in-depth vibratory

in order to allow high speeds, improve sealing and

analysis.

thus protect the mechanical environment. - Research into bearing instrumentation: The future of machine tools is in microelectronics, magnetism and machine-based firmware and this is why SNR's R&D department is continuing to carry out research into upgrades for MachLine products in the area of mechatronics. - Contribution of fundamental and applied research: As with all of SNR's ranges, MachLine has benefited from the company's active participation in European research programs, along with the largest worldwide steel manufacturers and major university research centers.

2.2 million N.Dm: extremely high speeds have been achieved with the ML range.

Medium-sized balls, providing a better balance between maximum speed and load capacity.

MachLine®: a vast array of solutions

HIGH PRECISION

• SNR series 71900V and 7000V, with excellent performance data to balance the need for speed, rigidity, capacity and precision. • Series 7200G1, specially designed to meet specifications set by applications with large, predominantly axial loads. • Variations according to contact angle (C for 15º and H for 25º) and preload (light, medium or heavy).

HYBRID, CERAMIC BALLS CH

• Possible variation for all ranges, all series and all dimensions with Silicon Nitride balls and steel rings, combining the best qualities of the two materials. • Reduced operating temperature and increased top speed. Reduced lubrication requirements as compared to a “conventional steel" bearing.

Manufacturing standard:

• Increased rigidity and longer life.

Whatever the machine tool application, there is a perfect MachLine solution.

HIGH SPEED ML Speed

MachLine range operating domain for a bearing with same bore diameter

+ 30 %

• Family made up of series 71900 and 7000, designed and developed by SNR to meet the increasingly stringent requirements in high speed mechanization. • Specially designed geometry: reduction in ball diameter, increase in number of balls and optimization of cage guidance on outer ring. • Different variations according to contact angle (C for 17° and H for 25°) and preload.

HIGH SPEED SEALED BEARING MLE ct Non-conta

sealing

• When oil lubrication is not required and grease lubrication is sufficient, SNR has a technically appropriate solution which is also economically attractive – the MLE family of bearings, series 71900 and 7000. • With nitrile rubber seals on the outer ring, not in contact with the inner ring, the same top speed can be attained as with an open bearing lubricated with grease.

Manufacturing precision 4S as standard (ISO 2, ABEC 9, for all rotation dynamic characteristics and ISO 4, ABEC 7, for all others).

• Variations according to contact angle (C for 17° and H for 25°) and preload.

MachLine速: a vast array of solutions

HNS bearings: N This bearing is a direct result of SNR's aeronautical know-how and its performance data for machine tools are remarkable: - Increased rotation speeds, - Better fatigue resistance, - More reliable even when poorly lubricated, - Longer life, - Corrosion resistant. Characteristics: Bearings made of stainless martensitic steel with nitrogen (material used in aeronautics). - Rings made of XD15N. - Ceramic balls.

Precision self-locking nuts Available in narrow or wide gauge, with a choice of 2 or 4 locking inserts, using blind holes or slots, the SNR range of precision self-locking nuts covers all requirements on the market. These products are vital: - for all precision bearing assemblies, - when a set of bearings need a guaranteed preload, which can be maintained over time, - for high axial loads.

• Preloading, definition of symbols

General technical details

12-14

• Rigidity, axial deflection

• Influence of an external axial load

• Speed correction factor

• Spindle design

18-24

• Lubrication

25-27

• Selection guide

28-29

• Ceramic ball bearings (CH)

30-31

• High speed bearings (ML)

• Sealed bearings (MLE)

• HNS bearings (N)

Each application has its own specific speed and load requirements, with a significant impact on geometry, material or lubrication. Over the next few pages, our engineers give you all the information necessary to make the optimum choice of bearings and how to install them correctly.

• Assembly demonstration

35-36

Preload: a direct effect on the application

Preload and preloading Preload is an important characteristic for any

Preloading an assembly consists of applying a

assembly as it is used to achieve a defined, managed

permanent axial load by abutting the faces of the

rigidity. It also has a direct influence on the load

bearings in the assembly. This load will lead to an

capacity and allowable rotational speed.

elastic deformation between balls and raceway and will create a contact pressure between the components.

Non-preloaded arrangement

Preloaded arrangement

Without pressure contact

Clearance

Pr 0 Penetration of ball into race

Example: assembly 7014HVDBJ84

The axial load is known as preload (Pr).

Clearance: 0,012 mm Preload: Pr = 1100 N (247 lbf) Deflection: 0,0025 mm Contact pressure: - inner ring: 960 N/mm2 (139,400 psi) - outer ring: 840 N/mm2 (121,800 psi)

Two methods for application Preloading by tightening faces of bearings in an assembly

Before tightening

After tightening

Preloading using calibrated springs

Before tightening

After tightening

Definition of symbols Pr a K Pri Prs PE CD Fa Fr

Preload Distance between the 2 spacers (Âľm) Deflection constant (Âľm (daN)-2/3) Initial preload (daN) Preload required (daN) Equilibrium preload for an assembly Separation load Axial load Radial load

P C P0 C0 N L10 fs Lna N.Dm

Equivalent dynamic load Basic dynamic load Equivalent static load Basic static load Rotation speed (rpm) Nominal service life (hr) Safety factor Corrected service life (hr) Speed factor

Preload: parameters to take into account Preload levels SNR has defined 3 preload levels which correspond

Should a specific preload be required, it can be

to a level of contact pressure suitable for operating

achieved using bearings preloaded as standard

conditions:

assembled with different length spacers.

- Light preload (code 7):

The following formula is used to calculate the space required between two spacers to alter the bearing

High-speed, light load applications.

assembly preload:

- Medium preload (code 8):

a = 2K(Pri2/3 â&#x20AC;&#x201C; PrS2/3)

Best balance between speed and load.

a: difference in length between the 2 spacers (Âľm) K: deflection constant (see page 44) Pri: initial preload (daN) Prs: preload required (daN)

- Heavy preload (code 9): Large load, reduced speed applications. - SNR can supply specific preloads on request (code X) to meet spindle operation optimization requirements.

See also page 15, axial deflection of an angular contact ball bearing.

Factors influencing preload The following factors can influence the preload

Make sure these parameters are fully taken into

value:

account when a spindle is designed. Contact

- assembly interference (fits),

SNR's design office for any further information.

- rotation speed,

They are always prepared to share their expertise in

- temperature, possibly associated with shaft and

this area.

housing materials, - geometry of the surrounding parts. 25

Preload increase factor according to rotation speed: comparison between 7012 and ML7012 bearings, versions with steel or ceramic balls.

ML7012CV MLCH7012CV

Increase factor

ML7012HV MLCH7012HV

10 7012CV/HV CH7012CV/HV

0 0,0

0,5

1,0

106 N.Dm

1,5

2,0

2,5

Rigidity and axial deflection Rigidity as a function of preload Example: a 7012 bearing assembled in DB

Comparison of rigidity by series

Radial 7012CV 70

CH71912HV

Radial 7012HV 60

71912HV

Rigidity (daN/µm)

CH7012HV

Axial 7012CV 40

7012HV CH7212HG1 7212HG1

0 0

200

400

600

800

1000

1200

1400

1600

200

Preload (daN)

400

600

800

1000

1200

1400

Preload (daN)

The rigidity is given by the preload. As preload increases, rigidity also increases in a non-linear manner.

Axial deflection of an angular contact ball bearing When a bearing is subject to an axial load Fa in daN,

K is the axial deflection constant for each bearing and

one of the rings undergoes axial displacement with

its value is given in the preload table (see page 44).

2/3

respect to the other, with a value δa: δa = K( Fa)

Preload application:

Axial displacement (µm)

2δ

Rigidity (daN/µm)

Axial 7012HV

For instance, let us take an assembly, Q16, with preload Pr on its bearings. There is a gap of 2δδ between the inner rings of bearings 2 and 3 prior to preloading.

Displacement of bearing 3 inner ring

2δδ = 2K(Pr)2/3 10

Displacement of bearings 1 and 2 inner rings

500

1000

1500 PE Preload (N)

2000

2500

3000

If the inner rings are abutted such as to close the gap 2δδ, the displacement is shown in the diagram opposite. The equilibrium preload for the assembly equals PE when clearance 2δδ is eliminated.

1600

Influence of an external axial load Axial deflection graph for assembly Q16

Bearing 3 A

Bearings 1 and 2 Axial displacement (µm) 2

Assembly D

When an axial load A is applied to the preloaded assembly, bearings 1 and 2 support an extra load. Their inner rings are displaced and bearing 3's inner ring is moved out and no longer under load. Axial load A leads to a displacement of inner rings δA. When δA = δ2, bearing 3 is unloaded (separation) and the preload is cancelled.

Axial load A

Axial load (daN)

Characteristic values for equilibrium preload PE and detachment load CD

Preload ring

Characteristics - Axial displacement: until preload is cancelled,

Assembly

DB - DF

2.83 Pr

this is equal to δ2. With the initial approximation,

Q16

1.36 Pr

5.66 Pr

it is defined by the line OD. Beyond point D, the

Q21

2 Pr

5.66 Pr

curve represents the bearings supporting axial

Pr: preload

load A: in the above examples, bearings 1 and 2. - Axial rigidity: until the preload is cancelled, mean rigidity is equal to CD/δ2.

Our engineers can send you the characteristic curves for any assembly on request. The axial and radial rigidity values for preloaded bearings are given on page 44.

- Detachment load CD: this is the axial load that leads to the separation of the bearing(s) in opposition: in the above example, bearing 3. 16

Speed correction factors

Each bearing can only rotate up to a certain speed known as its limit speed. A bearing's limit speed depends on its design, lubrication method and the thermal level tolerated at this speed. If any of these parameters are altered, the limit speed is altered.

According to assembly When bearings are put together in an assembly, the limit speed of the single bearing must be adjusted according to the assembly and the preload.

The limit speed for a single bearing is defined on page 41. For MachLine hybrid bearings, this value should be increased by 30 % (see page 31).

According to preload Preload is selected from three suggested levels: light, medium and heavy. The level should be selected according to the spindle's maximum speed, the desired rigidity and the detachment load.

Speed correction*

Assembly

After the above selections have been made, it is

Preload Light

Medium

Heavy

important to ensure that they can reach the required

0.90

0.80

0.65

maximum spindle speed.

0.80

0.70

0.55

0.75

0.65

0.40

Q16

0.70

0.60

0.35

Q21

0.65

0.55

0.30

* This factor is given for information to help in design. If a spindle is to be used continuously close to its limit speed, the thermal level reached should be checked to ensure that it is compatible with the required precision. For other types of assembly, please contact SNR.

Any non-compliance with the requisite geometric tolerances detracts from the assembly's maximum speed and thus from correct spindle operation.

Spindle design: simplified calculation method

Bearing pre-design This must be checked and optimized either by using the simplified and/or corrected calculation method with the bearing service life method, or by using an application-specific software design package.

Required service life The bearing service life on a spindle is linked to the

The corresponding service life cannot be directly

loss of machining precision (dimensional precision,

calculated. The only possible calculation is for

vibrations) or to abnormal heating.

service life L10 linked to material fatigue. Experience

This loss of precision is due to deterioration of race-

has shown that to give suitable spindle dimensions,

way surfaces and balls due to wear, contamination,

service life L10 should be of the order of 20,000

oxidation or lubricant deterioration (oil or grease).

hours.

Simplified calculation method This most simple method, recommended by the ISO

The simplified calculation method shown opposite

281 standard is used to calculate the nominal

is based on material fatigue as cause of failure.

service life reached by 90 % of bearings working under a dynamic load.

Equivalent dynamic load The torque and drive loads must be distributed over each bearing by using the normal methods of mechanical engineering. - Axial load: This is to be distributed uniformly over

- Radial load: This is to be distributed uniformly to

each bearing supporting this load. If “m” bearings

each bearing making up the main bearing. If there

support this load:

are « n » bearings making up the main bearing, the

Fa = A / m

radial load applied to each bearing will be:

A = axial load applied to main bearing.

Fr = R / n

0,9

R: radial load applied to main bearing

- Calculating the equivalent dynamic load:

Fa/Co

P = X Fr + Y Fa Coefficients X and Y are described in the table

Fa/Fr

Fa/Fr > e

opposite. To define them, calculate the ratio Fa/Co

0.015

0.38

0.44

1.47

and read the value for e and calculate Fa/Fr

0.029

0.40

0.44

1.40

and compare it to e.

0.058

0.43

0.44

1.30

0.087

0.46

0.44

1.23

0.12

0.47

0.44

1.19

0.17

0.50

0.44

1.12

0.29

0.55

0.44

1.02

0.44

0.56

0.44

1.00

0.58

0.56

0.44

1.00

0.68

0.41

0.87

Co is the basic static radial load. If the load varies between different machining types, 15°

the weighted equivalent radial load calculated is as follows:

P =( t1P13 + t2P23 + ..... + tiPi3)

1/3

ti = usage rate Pi = corresponding equivalent load

25°

The life of the bearings on the spindle

Nominal service life

is calculated to be the service life of Life in hours: L10 =(C/P)3 . 10 6/60N

the bearing supporting the greatest load.

C: dynamic basic load (see page 41) Co: basic static radial load (see page 41) N: rotation speed of the rotating ring in rpm

Spindle design: simplified and corrected calculation method Equivalent static load Should a bearing be subject to combined static loads, the equivalent static load needs to be calculated to compare it with the bearing's static load capacity. - Calculating the equivalent static load:

Po = Xo Fr + Yo Fa 15°

Coefficients Xo and Yo are given in the table opposite. To define them, the ratio Fa/Fr. A bearing's static load capacity is given as a reference value rather than an accurate limit that should not be exceeded. It is useful to take it into account, for instance, in assessing the influence of punctual loads such as those generated by tool release or bar advance systems.

25°

Fa/Fr

1.09

>1.09

0.50

0.46

0.50

0.38

1.31 >1.31

Safety factor: fs = i Co / Po

- Basic static capacity for a bearing Co: This is defined in ISO 76 standard as the radial load that

i: Number of bearings Co: Basic static load of bearing Po: Equivalent static load

generates a Hertz pressure of 4,200 MPa at the most highly loaded point of contact (rotating body

In principle, the minimum values for the safety factor fs:

and raceway).

• 2.5 to 3 for spindles in general • 1 to 1.5 for a short-term axial load.

Corrected calculation method The ISO 281 standard gives a corrected nominal service life formula L na which is expressed as a function of the basic nominal service life L10: Lna = a1.a2.a3.L10 - Coefficient a2

- Coefficient a1 Coefficient used to correct a calculation for a

Coefficient for correcting calculation according

reliability value other than 90 %. This factor is

to material and internal geometry.

given in the table below:

For certain applications, a bearing may be manufactured from a special steel other than conventional

Life

Reliability

Probability of failure

L10

90%

1.00

95%

0.62

In this case, a coefficient a2 which is greater than

96%

0.53

1 is applied. This coefficient is calculated according

97%

0.44

to experimental results

Material

obtained in SNR's

100Cr6

XD15N

2.8

98%

99%

steel, or have a non-standard internal geometry. These selections can give a much greater service life than that of a standard bearing.

0.33

research and testing 1

0.21

centers.

- Coefficient a3 Coefficient for correcting calculations according to operating conditions: contamination, lubrication, temperature... Please note that coefficients a2 and a3 are not independent. - Coefficient a3pol

- Coefficient a3lub

Contamination can reduce service life, depending

Bearing service life is influenced by the efficiency

on its type and the level at which the rotating

of lubrication, which, amongst other things, is

parts are loaded.

characterized by the oil film thickness. Elasto-

In most cases, a spindle bearing operates in

hydrodynamic theory shows that this latter value

maximum cleanliness conditions, and coefficient

depends almost entirely on oil viscosity and

a3pol will thus equal 1.

speed. The graphs below can be used to determine

For other types of

Filtration

a3pol

applications which are

< 3 µm

5 µm

0.95

10 µm

0.90

less well protected, coefficient a 3pol can have the following values:

coefficient a3lub.

Graph 1: viscosity-temperature Kinematic viscosity (cSt or mm2/s)

SA E SA 50 E SA 40 E SA 30 E 20 W SA E 10

ISO viscosity

VG 6 VG 80 46 VG 0 32 0

VG VG VG

Operating temperature (°C)

46 32 22

Spindle design: corrected calculation method Graph 2: required viscosity 1000 2

Example 5

500

Bearing 7012CV at 13,000 rpm lubricated with VG22 oil and operating at 122°F.

10 20

n 100 100 200

100 000

500

Graph 1: VG22 oil viscosity at 122°F is ν = 16 cSt

Service life

Required viscosity

[rp m

]

200

Graph 2: required viscosity for a 7012CV with mean diameter Dm = 77.5 mm at 13,000 rpm is: ν1 = 5 cSt

100

200

500 0

100

200

500

Graph 3: coefficient a3lub with viscosity ratio ν/ν1 = 16/5 = 3.2 is a3lub = 2.5

100

000

3 10 1

20 D+d

mm2 ] [ s

50 [mm]

100

200

77,5

500

1000

Mean bearing diameter

Graph 3: coefficient a3lub

2,5

Correcting coefficient a3lub

a3lub with extreme pressure additive

0,1 a3lub without extreme pressure additive

0,01 0,01

0,1

Ratio of actual viscosity to required viscosity ν/ν1

3,2 22

- Coefficient a3temp The operating temperature for bearing components

For most machine tool spindle applications,

is given in the table below:

coefficient a3temp = 1 is used, as the operating

Component

Max. temp.

Comment

302°F

302°F > 392°F

Rings Balls - steel - ceramic

temperature is well below 212°F. For other, more exposed applications, coefficient a3temp can have the following values:

Temperature

Cage - phenolic 212°F continuous Standard resin 248°F peak temperature

a3temp

< 212°F

230°F

0.96

248°F

0.92

- bronze - PEEK

392°F On request 248°F continuous On request 302°F peak temperature

266°F

0.88

Seals

212°F continuous 248°F peak temperature

284°F

0.84

248°F

302°F

0.8

Grease

Infinite service life In the area of materials development, we can define conditions under which bearings can have an infinite service life: - Metal surfaces fully separated by a film of oil, giving a 3lub > 1.5. - Extremely limited oil film contamination, giving a3pol = 1. - Load applied corresponds to Co/Po > 9, corresponding to Hertz pressure values lower than: 2,000 MPa for 100Cr6, 2,300 MPa for XD15N.

Spindle design: simulations Design software SNR's R&D department has developed design software for use in optimizing and checking spindle bearing dimensions. This software gives a fuller and more accurate simulation than the simplified or corrected methods. It provides a means to model the spindle and its bearings and to properly take load, rotation speed and lubrication into account. The software simulates the equilibrium state of a spindle rotating on bearings and subject to external loads. â&#x20AC;˘ It determines: - loads and the deflection at the contact between balls and rings, - loads applied to each bearing, - displacement of inner and outer rings, - shaft deformation, - axial and radial rigidity at the selected reference point. â&#x20AC;˘ It calculates: - the pressure values and dimensions of the elliptical contact surfaces, - the service life L10 of the bearings, based on the contact capacity, - the thickness of the lubricant film (the service life is adjusted in the event of insufficient film thickness).

-50 -25

75 1 00 1 25 1 50

175 X axis 200 225 250 275

Radius R (mm)

-20

-40

-60

-80 -50

100

150

200

250

300

350

400

450

500

X axis (mm)

Bearing center points Load application points

300

325 350 375

Representation of shaft deformation 400

425

450

475

0.010 0.008 0.006 0.004 0.002 0.000 -0.00 2 -0.00 4 -0.00 6 75 -0.0 100 -0.0 08 125 1 -0.0 0 150 175 -0.0 08 200 -0.0 06 225 04 0 2 .0 X axis 50 27 0.0 02 5 3 00 0.00 00 325 2 0.0 350 0.0 04 375 0.0 06 400 425 0.01 08 450 0 475

Displacement Y

25 50

Shaft modelling 80

Di sp lac em en tZ

-50 -25

Graphic display of input data and SNR results

SNR is at your service to check and optimize the bearings in your spindles on the basis of your specifications.

Projection of non-deformed shaft onto XOY AND XOZ Projection of deformed shaft onto XOY and XOZ Displacements 3D representation of deformed shaft Original shaft and bearing position

Appropriate lubrication: the secret for long bearing life Lubrication is an essential component of correct bearing function. It is used to avoid wear and seizure by placing an oil film between the rotating parts and the raceway. It also cools the bearing, by removing dissipated heat from the contacts and provides long-term corrosion protection for the bearing.

Selection of lubrication method This is determined according to the maximum

the heat produced can be removed by conduction

rotation speed and the loads, which determine the

via the environment without leading to overhea-

quantity of heat to be removed. It is thus inextricably

ting (∆T generally permitted 68°F to 77°F). - Oil lubrication (using oil mist or oil-air) is recom-

linked to machine design.

mended in other situations.

- Grease lubrication is recommended when the maximum required speed allows and when

Oil lubrication When the rotation speed exceeds the limit speed

For instance, for a 7016 bearing, the oil flow

for grease lubrication, oil lubrication must be chosen.

would be 50 mm3/hr per bearing, and the air pres-

SNR recommends that a low-viscosity oil is selected

sure 0.7 to 2 bar. Excess pressure generated in

in order to minimize heating effects - viscosity of

the spindle improves sealing.

the order of 20 cSt at 104°F (unless loads applied are very high).

- Oil-air lubrication: oil droplets are periodically introduced into an air duct. This system is cleaner

- Oil mist lubrication: lubrication occurs by means

and provides a good replacement for the oil mist

of a gentle flow of oil sprayed into an air duct.

system. Lubricant quantity can be better managed

Circulation of filtered dry air is used for cooling.

in this way.

Settings for 7016 bearing (example): - Circulation channels: the lubricant must be

• Oil flow: 60 mm3/hr for each bearing • Injection frequency: 8 min.

directed as close as possible to the bearing and

• Air pressure: 1.0 to 2.5 bars.

introduced between the inner ring and the cage.

- Note: settings are given for information and

The oil inlet pitch diameter (D5) and the space between inner ring and cage (E) are defined on page 40.

must be optimized to achieve the lowest possible thermal level.

Appropriate lubrication: the secret for long bearing life

Grease lubrication SNR recommends its own

MachLine high speed range - ML

MachLine high precision range

Mean volume of grease per bearing in cm3 - tolerance ± 10%

SNR-LUB GV + grease. It pro-

Bore code

Series 70

Series 719

Bore code

vides good resistance to high

0.1

0.3

0.4

0.2

speeds and loads and enables

0.2

0.1

0.4

0.5

0.2

a low operating torque value.

0.3

0.1

0.5

0.6

0.3

0.1

0.6

0.8

0.3

0.6

0.3

1.0

1.3

0.5

0.8

0.4

1.2

1.7

0.6

1.0

0.5

1.6

2.3

0.7

1.4

0.6

2.0

3.3

1.0

1.7

1.0

2.5

3.5

1.5

2.2

1.1

3.2

5.3

1.6

2.4

1.1

3.4

6.2

1.7

4.4

2.3

4.7

7.5

2.2

4.6

2.6

5.0

9.2

2.3

SNR-LUB GV+: - Base: synthetic oil, lithium soap. - Additives: antioxidant, antiwear, anti-corrosion, extreme pressure. - Low viscosity: : 15 cSt at 104°F - Operating temperature: between -58°F and +248°F. LUB GV+ grease is particularly

Series Series Series 70 72 719

5.2

2.7

5.3

2.5

recommended for applications

6.7

4.3

7.5

4.2

with vertical shafts.

7.1

4.6

7.8

4.3

9.3

4.8

4.5

9.6

6.5

6.3

12.9

6.8

6.5

12.8

7.0

7.3

13.5

9.6

9.7

18.3

22.1

10.3

23.5

13.3

34.8

17.5

107

110

140

190

The volume of grease recommended by SNR is defined in the table opposite. Alter this volume according to the operating speed on the basis of the correcting coefficients below.

% limit speed

Correcting coefficient

< 35 %

35 % to 75 %

0.75

> 75 %

0.60

Example: 7016 bearing to be used at 7,000 rpm (64 % of its limit speed with grease). Grease volume to be used: 10 cm3 x 0.75 = 7.5 cm3 N.Dm = product of mean bearing diameter (mm) multiplied by rotation speed (rpm). Grease application: see page 64.

Regreasing - Basic regreasing frequency: the graph below can

- Correcting regreasing frequency: the basic fre-

be used to determine the basic frequency in hours

quency Fb must be corrected by coefficients

according to bearing type.

given in the table below, according to particular spindle operating conditions, using the equation:

100 000

Fc = Fb.Te.Ta.Tt Coef. Te

15° 10 000

Fb (h)

25°

Ta 1 000

100 0,1

Tt 0,15

0,2

0,3

0,5

0,7

106 N.Dm These values are given for information and must always be confirmed by testing.

Conditions

Level

Coef. value

Environment - dust - damp - condensation

Low Medium High

1 0.8 0.5

Application - vertical shaft - vibrations - impacts

Low Medium High

1 0.8 0.5

Temperatures

1,5

< 167°F 1 167° to 185°F 0.8 185° to 248°F 0.5

Grease life Often spindle bearings are assembled such that the

Grease life is the period during which the grease

Hertz pressure values enable almost infinite resis-

will maintain its initial characteristics and lubricating

tance to fatigue. For this type of application, the

power. For any given grease, it is mainly a function

grease life becomes an important factor in defining

of the bearing rotation speed and its operating tem-

bearing service life.

perature.

1 000 000

Temperatures

100 000

Hours

30° 40° 50° 60° 70° 80° 90° 100°

10 000

N: bearing rotation speed Nmax: bearing rotation limit speed T: operating temperature (°C) These values are given for information and must always be confirmed by testing.

1 000 0,1

0,2

0,3

0,4

0,5

0,6

0,7

0,8

N / Nmax

0,9

chLine

MachLine® selection guide

Our MachLine range has been designed for spindle applications for most machine tools: lathes, milling and drilling machines, center bores, grinders, high speed spindles, etc. Their capacity to support operating constraints - cutting and drive forces - and their high rotation speeds have been optimized for the following criteria: rotational accuracy, dimensional stability, geometrical micro and micro variations, rigidity, heat, vibration and service life.

Features of angular contact bearings - Standard precision P4S: ISO4 (ABEC 7) for

- Very high quality 100Cr6 steel rings and balls, - Two contact angles: 15° and 25° (17° and 25° for

dimensional characteristics and ISO2 (ABEC 9) for all dynamic characteristics. It is also possible to

MachLine ML and MLE range), - Laminated resin cage centered on outer ring (Bronze

supply products with ISO 2 precision.

or PEEK cage on request), - Three preload grades (specific preloading on request),

With our manufacturing know-how we can align the preloaded outer ring and inner ring with very high precision, guaranteeing offset of less than 2µm. This non-standardized characteristic determines the preload value, which has a significant influence on spindle rigidity and behavior.

Comparison of internal geometry - MachLine High Speed – ML: Speeds 30 % faster than the standard range are achieved using an increased number of balls with reduced diameter and improved cage guidance on the outer ring.

Standard

- MachLine Sealed – MLE: Performance values at speeds comparable to a standard bearing MachLine Etanche Hybride (bille céramique) lubricated with oil are achieved with grease lubrication by using non-contact seals on ML range bearings.

MachLine

Standard

MLE

- MachLine Hybrid – CH: Bearing performance can be further by using ceramic balls instead MachLine enhanced Etanche Hybride (bille céramique) of steel balls.

MachLine Etanche MachLine Standard Hybride (bille céramique) ML and MLE bearings characteristics are laid out on page 48, and CH characteristics on page 30.

Features of versions on offer

Dimensions by series Comparison of cross-sections for a given outside diameter 70

719

- UNIVERSAL bearing, code U: with the selected preload, the inner ring and outer ring surfaces of

Outside diameter

Bore

719

these bearings are on the same plane. All types of arrangements can be achieved with this bearing. - Arrangements of UNIVERSAL bearings, codes DU,

Comparison of cross-sections for a given same bore

TU, QU...: Arrangement of several universal bearings whose outside diameters and bores are selected to ensure a tolerance range no more than half the ISO

Bearing series and version codes Series

tolerance level. - Arrangements of MATCHED bearings, codes DB,

Version code

7000

71900

7200

DF, DT, Q16, Q21...: These assemblies are matched by SNR and must not be re-arranged. They have the following characteristics: - Matching preload values,

- Variation of outside diameter and bore values - V version: Series 71900 and 7000 are the best suited

within a tolerance range no more than half the ISO

to high rotation speeds. They provide the best

standard tolerance,

combination of speed, capacity, rigidity and precision

- Assembly is identified with a â&#x20AC;&#x153;Vâ&#x20AC;? marked on the

characteristics.

outside diameter of all bearings in an assembly.

- G1 version: The G1 version was specially designed

These features, in particular the extremely precise

to meet series 7200 specifications, which is designed

preload values, mean that greater spindle precision

to withstand predominantly major axial loads.

can be achieved, with better rigidity and longer life.

Version selection: SNR offers several options for creating a bearing arrangement.

Examples of identification codes for matched assemblies DB

Q16

Q21

= Direction of maximum machining load applied to shaft

Specific tolerances Certain specific applications may require bearings

specifications. These bearings are identified with the

with lower bore and outside diameter tolerances,

letter R, as shown in the following coding example:

values centered with respect to ISO 4 tolerance

71912CVURJ74.

MachLine® CH - Hybrid: selecting a ceramic ball

The internal design of SNR series can greatly increase bearing performance and life with ceramic balls.

Ceramic properties The ceramic used is a Silicone Nitride: Si3N4

• low coefficient to friction,

• low density: 0.1156 Ibs/in3,

• electrical insulator,

• low coefficient of thermal expansion,

• low heat conductivity,

• high modulus of elasticity: 45 x 106 psi,

• corrosion-resistant.

• non-magnetic,

Significant results These physical properties make it possible to: • increase rotation speed at a given operating temperature, • improve bearing rigidity, • increase bearing life.

All MachLine High Precision ranges, ML, MLE and 7000, 71900 and 7200 series are available as a hybrid version.

Performance values for MachLine CH - Hybrid Increase in rotation speed:

3 times longer life:

+ 30%

The kinematics of SNR hybrid bearings generates

The lubrication and friction behavior of ceramics, in

less slipping and heating than steel ball bearings.

particular, their low friction coefficient and capacity

At a given temperature, they can operate at

to operate in reduced lubrication conditions, means

approximately 30 % higher speeds than steel ball

that bearing raceways resist wear and damage

bearings.

much longer than with steel balls. The actual service life depends on operating conditions, but has been observed to be on the order of 2 or 3 times greater

Improved rigidity:

than steel ball bearings (under comparable opera-

+ 10%

ting conditions).

The fact that the modulus of elasticity of ceramics is higher than that of steel means that the rigidity of a hybrid bearing can be increased by approximately

Lubrication:

10 % under a given preload.

Reduce costs Lubricants used for 100Cr6 steel bearings can generally be used with ceramic ball bearings. Some

In certain situations, the properties of "hybrid" bearings may allow grease lubrication where air-oil lubrication would otherwise be required due to the required rotation speed. This option provides economic advantages.

applications may require a specific study to define the recommended lubricant.

Example for a CH7009CVDTJ04, spring preloaded to 550 N 80 70

Temperature as a function of rotation speed: At a temperature of 113째F, the rotation speed goes from 10,000 rpm with steel balls to 13,000 rpm with ceramic balls.

Steel ball

Bearing temperature

60 Ceramic ball 50 40 30 20 10

5000

10000

20000 13000 Rotation speed (rpm)

25000

30000

MachLine® ML - High Speed: our solution for very high speeds SNR has developed a range specifically designed to meet increasingly stringent requirements in applications using very high speed spindles.

Optimized design The ML range is made up of series 7000 and 71900. The internal geometry of these bearings has been optimized to guarantee optimum behavior and operation at limit speeds: - Angle of contact 17° and 25°. - Precision 4S. - Phenolic resin cage with improved guidance. - Design optimized for oil lubrication.

Residual theoretical average contact angle 18 17° Design

Contact angle (degrees)

16 14 12

15° Design 10 8

The graph opposite shows changes in the contact angle of a ML7011CVUJ74S according to rotation speed. The advantage of a 17° design is that it maintains a larger contact angle at top speeds than a 15° design.

6 4 2 0 0

5 000

10 000

15 000

20 000

25 000

30 000

Rotation speed (rpm)

A « V » is marked on the outside diameter, in direction of the contact angle, to facilitate installation and creation of bearing arrangements.

Performance: reducing operating deformations - Increase rotation speed, while maintaining a load

These performance values have been made pos-

capacity compatible with the service life target for

sible by using smaller balls and more of them.

high speed spindles.

This design has the major advantage of increasing the ring cross-section, reducing operation deformations.

- Speed coefficient on the order of 2.2x10 N.Dm. 6

MachLine® MLE - Sealed: by definition, a cost-saving solution

Reduce maintenance costs SNR has specially developed MLE bearings for

and can cause critical functional failures for spindle use.

machine tool spindles, a part of the trend for simpli-

For grease-lubricated applications, the MLE bearing

fied mechanisms.

means no more complex, expensive sealing sys-

Conventional lubrication systems (oil mist, air-oil)

tems and regreasing operations.

are no longer required with this type of bearing. These methods are expensive, difficult to maintain

Design and features The design of these bearings is based on ML bearings, available in series 7000 and 71900: - Contact angle 17° and 25°. - Precision 4S. - Non-contact seals: avoids over-heating linked to friction on seals. - Reduced clearance between seal lip and the shoulder of the inner ring: limiting contaminant entry and avoiding grease leaks. - Greased in factory by SNR, using optimum quantities of SNR-LUB GV+, recommended by our research and test center. - Greased in clean room: avoiding contamination during assembly.

Use of a MachLine High Speed ML bearing lubricated with SNR LUB GV+ grease can give the same performance values at high speed as a standard bearing lubricated with oil.

A single « V » is marked on the outside diameter to facilitate assembly and creating bearing arrangements.

MachLine® HNS – N: for extreme conditions

SNR offers MachLine HNS for applications where the bearing is operating at extreme speed or load conditions. It was developed for the aviation and aerospace industries.

General features This bearing has stainless steel rings and ceramic

stainless steel, developed by SNR in partnership

balls.

with Aubert & Duval. It is highly corrosion-resistant

XD15N steel is a nitrogen-strengthened martensitic

and resistant to wear and surface damage.

Performance of XD15N steel… Its conventional manufacturing methods using ESR

with excellent cleanliness, guaranteeing greater

(Electro Slag Remelted) - and its highly machinable

fatigue resistance than conventional steel.

property make this a very high performance steel,

… and ceramic balls This bearing uses ceramic balls to give all the lubricant and wear advantages of ceramic-steel contact – high resistance to wear and deterioration (see page 31).

The SNR research and test center has established coefficient a2 in calculating the corrected service life for XD15N – a value of 2.8 (see page 20).

Spindle types and installation examples

Classification of spindle applications into broad areas This classification gives the most usual configurations, but others are possible.

Number of bearings

Bearing

Field of application

Arrangement

Light to medium loads – high speeds Installed on boring, milling, drilling units and grinding spindles.

Front

Rear

4 Light loads – very high speeds Often installed on internal grinding spindles, spring preloaded.

Front

Rear

Heavy loads (single direction axial loads) - medium speeds Very often installed on boring and milling machines, lathes and boring, milling and drilling units.

Front

5 Rear

Heavy loads – medium speeds Useful when installed on assemblies where the axial load applies in both directions. For spindles on boring and milling machines, lathes and boring, milling and drilling units.

Front

6 Rear

Spindle types and assembly examples

Example 1: MachLine Standard bearings Q21 arrangement

Example 2: MachLine ML bearings Front bearing: DT arrangement Rear bearing: DT arrangement spring preloaded

Example 3: MachLine MLE bearings Front bearing: Q16 arrangement Rear bearing: DB arrangement

Example 4: MachLine MLE bearings Front bearing: DB arrangement Rear bearing: DB arrangement

Example 5: MachLine Standard bearings Front bearing: Q21 arrangement Rear bearing: DB arrangement

MachLine range

To help in your choices, the section gives all part numbers, characteristics and tolerances for our range of bearings and precision self-locking nuts. You are also provided with a whole range of operational information to facilitate your logistics and make easier to understand our symbol, marking and packaging code systems.

• Symbols, labelling and packaging

38-39

• MachLine: the ranges

40-51

• Precision self-locking nuts

52-54

• Summary of the ranges • Tolerances and precision classes

55 56-60

Symbol system for MachLine® bearings *

Code Dimensions 00 10 mm 01 12 mm 02 15 mm 03 17 mm 04 x 5 20 mm 05 x 5 25 mm .... x 5 etc…

719

Series V

719 (ISO 19) 70 (ISO 10) 72 (ISO 02)

High Precision bearings Series 719-70 Stratified phenolic cage guided by the outer ring

Tolerance classes Code Precision 4 P4S for standard

G1 High load capacity bearing Serie 72 Stratified phenolic cage guided by the outer ring

Hybrid bearing HNS bearing

CH 719 12

Sealed bearing

Symbol preceding preload and precision functions

= Standard ring

(no code)

High Speed range

Lubrication holes in outer ring

Bore diameter

Contact angle α Code Stand. ML C 15° 17° H 25° 25°

4S 2

P4S for ML and MLE ISO 2 (ABEC 9)

Arrangement code

Specials

Universal bearing and arrangement of universal bearings U Universal single bearing DU Universal pair TU Arrangement of 3 universal bearings QU Arrangement of 4 universal bearings

Example: D = greased bearing

Arrangement of paired bearings: identical contact angles DB

Q16

Q21

Q18

Arrangement of paired bearings: different contact angles Q30

Q34

Preload Code 7 8 9 X 0

Designation Light Medium Heavy Special Not defined

* (empty) standard bearing R = classification of inner and outer diameter

For other arrangements, consult SNR

Packaging available from 2006

Marking and packaging Marking O assembly

DU X assembly

Tandem assembly

- Universal bearings: A single « V » is marked on the outside diameter to facilitate assembly. This identification is currently used for ML and MLE bearings and will be gradually incorporated into all ranges in 2006. - Matched bearing arrangements: The « V » marked on the outside diameter shows the position of the bearings in the arrangement, enabling the assembly to be centered at installation (see installation recommendations).

Bearing or arrangement part number

The registration number of

the

arrangement

Max. run-out point

enables assemblies to be put back together if bearings get mixed up. The « V » of the arrangement is at 90° angle to the single « V » on the outside diameter.

Max. run-out point

Bore and outside diameter dimension

Packaging After being coated with an anti-oxidant, MachLine bearings are individually packed in a heat-sealed plastic bag. If the bearing is kept in its original packaging, long-term oxidation protection is guaranteed. - Universal bearings. Information shown on package: bearing part number, packaging date, bore and outside diameter dimensions. - Matched bearing arrangements: for bearing arrangements, boxes containing the bearings are bound with adhesive tape stating "Do not separate". Information shown on package: arrangement part number, packaging date, bore and outside diameter dimensions.

All SNR MachLine bearings have been given a holographic label with several security features as part of our ongoing fight against counterfeiting.

MachLine速: ranges High Precision - Standard

Series 719 / 70 / 72 Dimensions

Weight

Ibs

22 26 30

6 8 9

0.022 0.040 0.066

24 28 32

6 8 10

28 32 35

Series

Hole for lubrication

Shoulders and fillets (mm)

Balls

Diam.

71900 7000 7200

17.8 21.4 24.5

13.6 14.7 16.0

18.8 22.7 25.5

0.3 0.3 0.6

0.1 0.1 0.3

14.7 16.5 18.2

1.10 1.85 2.25

3.175 4.762 5.556

11 10 10

0.024 0.044 0.082

71901 7001 7201

19.6 23.4 26.0

15.4 16.7 18.3

20.6 24.7 27.9

0.3 0.3 0.6

0.1 0.1 0.3

16.5 18.5 20.5

1.30 1.65 1.85

3.175 4.762 5.953

13 11 10

7 9 11

0.033 0.062 0.097

71902 7002 7202

24.3 26.9 29.0

18.7 20.2 21.1

25.4 28.2 31.3

0.3 0.3 0.6

0.1 0.1 0.3

20.0 22.0 23.3

1.40 1.65 2.10

3.969 4.762 5.953

13 13 11

30 35 40

7 10 12

0.037 0.082 0.143

71903 7003 7203

26.6 29.4 33.0

21.0 22.7 24.1

27.7 30.7 35.2

0.3 0.3 0.6

0.1 0.1 0.3

23.0 24.4 26.5

1.45 1.75 2.45

3.969 4.762 6.747

14 14 11

37 42 47

9 12 14

0.079 0.139 0.232

71904 7004 7204

31.9 35.5 38.6

25.1 26.6 28.5

33.2 37.3 41.4

0.3 0.6 1.0

0.15 0.3 0.3

26.8 29.0 31.3

1.78 2.40 2.80

4.762 6.350 7.938

15 13 11

42 47 52

9 12 15

0.090 0.168 0.282

71905 7005 7205

37.4 40.1 44.5

30.6 32.2 34.0

38.7 42.3 46.9

0.3 0.6 1.0

0.15 0.3 0.3

32.3 34.2 36.8

1.75 2.05 2.80

4.762 6.350 7.938

17 15 13

47 55 62

9 13 16

0.104 0.247 0.441

71906 7006 7206

41.9 47.0 52.1

35.1 38.1 40.4

43.2 49.5 55.4

0.3 1.0 1.0

0.15 0.3 0.3

36.8 40.4 43.5

1.73 2.35 3.15

4.762 7.144 9.525

18 16 13

55 62 72

10 14 17

0.165 0.331 0.639

71907 7007 7207

48.6 53.1 61.0

41.4 43.2 47.4

50.4 56.3 64.5

0.6 1.0 1.1

0.15 0.3 0.3

43.2 46.0 50.9

1.85 2.85 3.50

5.556 7.938 11.112

18 16 13

62 68 80

12 15 18

0.243 0.408 0.816

71908 7008 7208

55.2 59.0 67.6

46.8 49.2 52.8

57.2 61.8 71.8

0.6 1.0 1.1

0.15 0.3 0.6

49.0 51.8 56.9

2.18 2.55 4.05

6.350 7.938 11.906

19 18 13

68 75 85

12 16 19

0.282 0.525 0.917

71909 7009 7209

60.7 65.0 72.5

52.3 54.7 57.4

62.7 68.6 77.5

0.6 1.0 1.1

0.3 0.3 0.6

54.5 57.5 61.7

2.15 2.85 4.30

6.350 8.731 12.700

20 18 14

72 80 90

12 16 20

0.284 0.564 1.072

71910 7010 7210

65.2 70.0 76.9

56.8 59.7 62.5

67.2 73.6 82.7

0.6 1.0 1.1

0.3 0.3 0.6

58.9 62.5 66.7

2.13 2.80 4.20

6.350 8.731 12.700

21 19 15

80 90 100

13 18 21

0.399 0.860 1.367

71911 7011 7211

72.5 80.0 87.0

62.1 65.0 68.0

75.8 84.0 92.5

1.0 1.1 1.5

0.3 0.6 0.6

65.4 69.0 72.5

2.25 2.00 2.10

7.144 9.525 14.288

21 19 14

85 95 110

13 18 22

0.430 0.926 1.786

71912 7012 7212

77.5 85.0 95.0

67.1 70.0 75.0

80.8 89.0 101.5

1.0 1.1 1.5

0.3 0.6 0.6

70.4 73.8 79.5

2.25 2.00 2.30

7.144 9.525 15.875

23 21 14

90 100 120

13 18 23

0.463 0.970 2.514

71913 7013 7213

82.5 90.0 104.0

72.5 75.0 81.0

86.0 94.0 109.0

1.0 1.1 1.5

0.3 0.6 0.6

74.5 78.8 87.0

1.25 2.00 2.30

7.144 9.525 15.875

27 22 15

100 110 125

16 20 24

0.750 1.345 2.426

71914 7014 7214

91.0 98.5 109.0

79.0 81.5 86.0

95.0 103.0 116.0

1.0 1.1 1.5

0.3 0.6 0.6

81.5 85.8 91.4

1.50 2.50 2.60

8.731 11.112 17.462

24 21 14

Max.

r3 r2

E D

D4 d2

d2 D1

D5 a

Series 719 CV 70 CV / 72 CG1 Series C

a (mm)

15째

Basic load,values in Ibf C Dynamic

Series 719 HV 70 HV / 72 HG1

gle Contact an

Co Static

Limit speed in rpm Grease

Oil

Series H

a (mm)

gle Contact an

25째

Basic load values in Ibf C Dynamic

Co Static

Limit speed in rpm Grease

Oil

71900CV 7000CV 7200CG1

5 6 7

686 1,283 1,688

342 619 833

71,000 60,000 53,000

108,000 95,000 82,000

71900HV 7000HV 7200HG1

7 8 9

653 1,238 1,620

326 596 799

67,000 53,000 46,000

103,000 82,000 72,000

71901CV 7001CV 7201CG1

5 7 8

765 1,395 1,935

419 720 968

64,000 54,000 48,000

97,000 85,000 74,000

71901HV 7001HV 7201HG1

7 9 10

731 1,350 1,868

398 686 945

61,000 48,000 42,000

93,000 72,000 65,000

71902CV 7002CV 7202CG1

6 8 9

1,148 1,575 2,115

641 900 1,125

52,000 46,000 42,000

79,000 72,000 65,000

71902HV 7002HV 7202HG1

9 10 11

1,091 1,508 2,048

619 866 1,091

49,000 42,000 37,000

75,000 62,000 57,000

71903CV 7003CV 7203CG1

7 8 10

1,193 1,665 2,610

709 1,001 1,440

46,000 41,000 37,000

70,000 65,000 58,000

71903HV 7003HV 7203HG1

9 11 13

1,148 1,575 2,520

675 956 1,395

44,000 37,000 32,000

68,000 56,000 50,000

71904CV 7004CV 7204CG1

8 10 11

1,733 2,655 3,510

1,103 1,598 2,003

39,000 35,000 32,000

60,000 55,000 49,000

71904HV 7004HV 7204HG1

11 13 15

1,643 2,543 3,375

1,046 1,530 1,913

37,000 31,000 28,000

57,000 47,000 43,000

71905CV 7005CV 7205CG1

9 11 13

1,868 2,925 3,960

1,305 1,935 2,498

33,000 30,000 27,000

50,000 47,000 42,000

71905HV 7005HV 7205HG1

12 14 16

1,755 2,790 3,803

1,238 1,845 2,385

31,000 26,000 24,000

47,000 40,000 37,000

71906CV 7006CV 7206CG1

10 12 14

1,890 3,758 5,490

1,418 2,633 3,578

29,000 25,000 23,000

44,000 40,000 35,000

71906HV 7006HV 7206HG1

13 16 19

1,800 3,578 5,265

1,328 2,520 3,420

27,000 22,000 20,000

42,000 34,000 31,000

71907CV 7007CV 7207CG1

11 13 16

2,498 4,725 7,313

1,913 3,488 4,883

25,000 23,000 20,000

38,000 35,000 31,000

71907HV 7007HV 7207HG1

15 18 21

2,363 4,500 6,975

1,823 3,330 4,658

23,000 21,000 17,000

36,000 31,000 27,000

71908CV 7008CV 7208CG1

13 15 17

3,308 4,860 8,213

2,655 3,780 5,625

21,000 21,000 18,500

33,000 33,000 29,500

71908HV 7008HV 7208HG1

18 20 23

3,128 4,613 7,875

2,498 3,600 5,423

20,000 20,000 16,500

31,000 30,000 25,500

71909CV 7009CV 7209CG1

14 16 18

3,465 6,165 10,328

2,408 4,320 6,728

20,000 19,000 16,500

30,000 28,000 26,000

71909HV 7009HV 7209HG1

19 22 25

3,263 5,850 9,855

2,273 4,073 6,413

18,000 18,000 15,000

26,000 24,000 22,500

71910CV 7010CV 7210CG1

14 17 19

3,510 6,345 10,800

2,543 4,545 7,335

19,000 18,000 15,500

28,000 26,000 24,500

71910HV 7010HV 7210HG1

20 23 26

3,308 5,985 10,283

2,385 4,343 6,930

16,000 14,500 13,500

24,000 22,000 20,500

71911CV

7011CV 7211CG1

16 19 21

4,208 6,863 11,925

3,083 5,850 9,000

16,500 16,000 14,500

25,000 24,000 21,500

71911HV 7011HV 7211HG1

22 26 29

3,960 6,525 11,475

2,903 5,603 8,550

13,500 14,000 12,500

21,500 22,000 19,500

71912CV 7012CV 7212CG1

16 19 22

4,388 7,313 14,625

3,375 6,638 11,025

14,500 15,000 12,500

23,500 23,000 19,500

71912HV 7012HV 7212HG1

23 27 31

4,140 6,863 13,950

3,195 6,300 10,575

13,500 14,000 11,000

20,000 21,000 17,500

71913CV 7013CV 7213CG1

17 20 24

4,883 7,425 15,075

4,928 6,975 12,150

14,500 14,000 11,500

22,000 21,000 17,500

71913HV 7013HV 7213HG1

25 28 33

4,590 7,088 14,400

4,590 6,638 11,700

14,000 13,000 10,000

21,000 19,000 16,500

71914CV 7014CV 7214CG1

19 22 25

6,638 9,675 17,325

6,525 9,000 13,500

13,000 13,000 11,000

20,000 20,000 16,500

71914HV 7014HV 7214HG1

28 31 35

6,300 9,113 16,425

6,188 8,438 12,825

12,500 12,500 9,700

19,000 19,000 15,000

MachLine速: ranges High Precision - Standard

Series 719 / 70 / 72 Dimensions

Weight

Ibs

105 115 130

16 20 25

0.794 1.433 2.646

110 125 140

16 22 26

120 130 150

Series

Hole for lubrication

Shoulders and fillets (mm) D1

Diam.

71915 7015 7215

96.0 103.5 114.0

84.0 86.5 91.0

100.0 108.0 121.0

1.0 1.1 1.5

0.3 0.6 0.6

86.3 90.7 96.4

1.50 2.50 2.60

8.731 11.112 17.462

26 22 15

0.838 1.874 3.241

71916 7016 7216

101.0 112.0 122.5

89.0 93.0 97.5

105.0 117.5 130.0

1.0 1.1 2.0

0.3 0.6 1.0

91.2 98.0 103.4

1.50 3.50 2.80

8.731 13.494 19.050

27 20 15

18 22 28

1.213 1.985 3.991

71917 7017 7217

110.0 117.0 131.0

95.0 98.0 104.0

114.0 122.5 140.0

1.1 1.1 2.0

0.6 0.6 1.0

98.6 102.8 110.3

1.80 3.50 3.10

9.525 13.494 20.638

27 21 15

125 140 160

18 24 30

1.279 2.558 4.939

71918 7018 7218

115.0 125.5 139.0

100.0 104.5 111.0

119.0 131.5 149.0

1.1 1.5 2.0

0.6 0.6 1.0

103.5 110.0 117.2

1.80 3.80 3.30

9.525 15.081 22.225

29 20 15

130 145

18 24

1.301 2.668

71919 7019

120.0 130.5

105.0 109.5

124.0 136.5

1.1 1.5

0.6 0.6

108.3 114.8

2.00 3.80

10.319 15.081

28 21

100

140 150 180

20 24 34

1.808 2.800 7.122

71920 7020 7220

128.5 135.5 155.5

111.5 114.5 124.5

133.5 141.5 167.0

1.1 1.5 2.1

0.6 0.6 1.1

115.6 119.7 131.0

2.10 3.80 3.80

11.112 15.081 25.400

28 22 14

105

145 160

20 26

1.896 3.550

71921 7021

133.5 144.5

116.5 120.5

138.5 150.0

1.1 2.0

0.6 1.0

120.5 127.0

2.10 4.00

11.112 15.875

29 22

110

150 170 200

20 28 38

1.962 4.410 9.989

71922 7022 7222

138.5 153.0 172.5

121.5 127.0 137.5

143.5 160.0 185.5

1.1 2.0 2.1

0.6 1.0 1.1

125.5 134.0 145.0

2.10 4.50 4.30

11.112 17.462 28.575

30 21 14

120

165 180 215

22 28 40

2.624 4.741 12.348

71924 7024 7224

151.5 163.0 185.5

133.5 137.0 149.5

157.5 170.0 197.5

1.1 2.0 2.1

0.6 1.0 1.1

137.7 144.0 157.5

3.30 4.50 4.30

13.494 17.462 28.575

28 23 16

130

180 200

24 33

3.462 7.012

71926 7026

165.0 179.5

145.0 150.5

172.0 189.0

1.5 2.0

0.6 1.0

149.8 158.0

3.70 5.30

15.081 20.638

27 21

140

190 210

24 33

3.704 7.541

71928 7028

175.0 189.5

155.0 160.5

182.0 199.0

1.5 2.0

0.6 1.0

159.8 168.0

3.70 5.30

15.081 20.638

29 23

150

210 225

28 35

5.777 9.173

71930 7030

192.5 203.0

167.5 172.0

199.0 213.0

2.0 2.1

1.0 1.0

174.0 180.0

4.10 5.70

16.669 22.225

29 23

160

220 240

28 38

6.086 11.312

71932 7032

202.5 216.0

177.5 184.0

209.0 227.0

2.0 2.1

1.0 1.0

184.0 192.0

4.10 6.20

16.669 23.812

30 23

170

230 260

28 42

6.417 15.391

71934 7034

212.5 232.5

187.5 197.5

219.0 246.0

2.0 2.1

1.0 1.1

194.0 206.4

4.10 6.60

16.669 25.400

32 23

180

250 280

33 46

9.393 19.845

71936 7036

229.0 249.5

201.0 210.5

237.5 264.0

2.0 2.1

1.0 1.1

208.3 219.8

4.70 7.80

19.050 30.163

30 21

190

260 290

33 46

9.878 20.727

71938 7038

239.0 259.5

211.0 220.5

247.5 274.0

2.0 2.1

1.0 1.1

218.3 229.8

4.70 7.80

19.050 30.163

32 22

200

280 310

38 51

13.583 26.791

71940 7040

255.5 276.5

224.5 233.5

266.0 292.0

2.1 2.1

1.0 1.1

232.0 243.6

5.50 8.60

23.812 33.338

27 21

220

300 340

38 56

14.928 35.897

71944 7044

275.5 304.0

244.5 256.0

286.0 321.0

2.1 3.0

1.0 1.1

252.0 268.6

5.50 8.60

22.225 33.338

31 23

240

320

16.030

71948

295.5

264.5

306.0

2.1

1.0

272.0

5.50

22.225

Max.

Balls

r3 r2

E D

D4 d2

d2 D1

D5 a

Series 719 CV 70 CV / 72 CG1 Series C

a (mm)

Basic load values in Ibf C Dynamic

Series 719 HV 70 HV / 72 HG1

gle Contact an

15째 Limit speed in rpm

Co Static

Grease

Oil

Series H

a (mm)

Basic load values in Ibf C Dynamic

gle Contact an

25째 Limit speed in rpm

Co Static

Grease

Oil

71915CV 7015CV 7215CG1

20 23 26

6,863 9,900 18,000

7,088 9,450 14,625

12,500 12,000 10,000

19,000 19,000 16,000

71915HV 7015HV 7215HG1

29 32 36

6,525 9,338 17,100

6,638 9,000 13,950

12,000 11,000 9,100

18,000 17,000 14,500

71916CV 7016CV 7216CG1

21 25 28

6,975 13,275 21,150

7,425 12,375 17,550

12,000 11,000 9,400

18,000 17,000 15,000

71916HV 7016HV 7216HG1

30 35 39

6,638 12,600 20,025

6,863 11,925 16,650

11,000 10,500 8,500

17,000 16,000 13,000

71917CV 7017CV 7217CG1

23 25 30

8,213 13,725 24,300

8,775 13,275 20,475

11,000 10,500 8,700

17,000 16,000 14,000

71917HV 7017HV 7217HG1

33 36 41

7,763 13,050 23,175

8,213 12,600 19,350

9,900 9,900 7,800

15,000 15,000 12,000

71918CV 7018CV 7218CG1

23 27 32

8,550 16,425 27,900

9,338 15,525 23,625

10,500 10,000 8,100

16,000 15,000 12,500

71918HV 7018HV 7218HG1

34 39 44

7,988 15,525 26,550

8,775 14,850 22,500

9,900 9,200 7,300

15,000 14,000 11,000

71919CV 7019CV

24 28

9,675 16,650

10,688 16,425

9,900 9,700

15,000 14,500

71919HV 7019HV

35 40

9,113 15,975

9,900 15,525

9,200 8,900

14,000 13,500

71920CV 7020CV 7220CG1

26 29 36

11,025 17,100 33,750

12,375 17,325 28,575

9,500 9,300 7,200

14,500 14,000 11,000

71920HV 7020HV 7220HG1

38 41 50

10,350 16,200 32,175

11,475 16,425 27,225

8,600 8,600 6,400

13,000 13,000 9,800

71921CV 7021CV

27 31

11,250 18,900

12,825 19,350

9,200 8,800

14,000 13,500

71921HV 7021HV

39 44

10,575 17,775

11,925 18,225

8,600 7,900

13,000 12,000

71922CV 7022CV 7222CG1

27 33 40

11,475 21,825 39,825

13,275 22,050 36,000

8,900 8,300 6,300

13,500 12,500 9,700

71922HV 7022HV 7222HG1

40 47 55

10,688 20,700 38,025

12,375 20,925 34,425

8,200 7,600 5,600

12,500 11,500 8,700

71924CV 7024CV 7224CG1

30 34 42

15,750 22,950 43,425

18,225 24,525 42,075

8,200 7,700 5,700

12,500 11,500 8,700

71924HV 7024HV 7224HG1

44 49 59

14,850 21,600 41,400

17,100 23,175 40,050

7,500 6,900 5,100

11,500 10,500 7,800

71926CV 7026CV

33 39

18,900 29,475

22,050 30,825

7,500 7,000

11,500 10,500

71926HV 7026HV

48 55

17,775 27,900

20,700 29,250

6,900 6,500

10,500 9,800

71928CV 7028CV

34 40

19,575 31,050

23,625 34,200

7,200 6,600

11,000 10,000

71928HV 7028HV

50 57

18,450 29,250

22,050 32,400

6,400 6,100

9,800 9,200

71930CV 7030CV

38 43

23,625 35,550

28,800 39,600

6,500 6,200

9,000 9,300

71930HV 7030HV

56 61

22,275 33,525

27,000 37,575

5,900 5,700

9,000 8,600

71932CV 7032CV

39 46

23,850 40,275

29,700 45,450

6,200 5,800

9,400 8,800

71932HV 7032HV

58 66

22,500 38,025

27,675 42,975

5,600 5,300

8,500 8,100

71934CV 7034CV

41 50

24,075 45,000

31,500 51,750

5,800 5,400

8,900 8,100

71934HV 7034HV

61 71

23,175 42,525

29,475 49,050

5,300 5,000

8,100 7,500

71936CV 7036CV

45 54

30,375 54,900

38,925 65,250

5,400 5,000

8,300 7,600

71936HV 7036HV

67 77

28,575 51,975

36,225 61,875

4,900 4,600

7,500 7,000

71938CV 7038CV

47 55

31,275 56,250

41,175 68,625

5,200 4,800

7,900 7,300

71938HV 7038HV

69 79

29,475 53,325

38,475 65,250

4,700 4,400

7,200 6,700

71940CV 7040CV

51 60

43,200 63,000

54,675 79,875

4,800 4,500

7,400 6,900

71940HV 7040HV

75 85

40,725 59,625

51,525 75,375

4,400 4,200

6,800 6,300

71944CV 7044CV

54 66

40,500 66,375

54,450 88,875

4,400 4,100

6,800 6,200

71944HV 7044HV

77 93

38,250 63,000

50,850 84,375

4,000 3,700

6,200 5,700

71948CV

41,625

57,375

4,200

6,400

71948HV

39,150

53,550

3,800

5,800

MachLine®: ranges High Precision - Standard Preload, axial and radial rigidity of DU DB DF arrangements Symbol

Deflection constant

Preload (Ibf)

Axial rigidity (Ibf/µm)

Radial rigidity (Ibf/µm)

K (1)

71900CV 7000CV 7200CG1 71900HV 7000HV 7200HG1 71901CV 7001CV 7201CG1 71901HV 7001HV 7201HG1

2.58 2.33 2.12 1.25 1.14 1.03 2.31 2.19 2.11 1.12 1.06 1.03

3 6 9 5 10 14 3 7 9 6 11 16

9 18 27 16 29 41 10 20 29 17 32 47

17 36 52 32 59 81 19 41 56 34 63 95

3 4 5 7 9 12 3 5 5 8 11 13

5 7 9 11 15 18 5 7 9 13 16 19

7 10 12 15 20 25 8 11 12 17 21 25

16 23 29 15 20 25 20 25 30 18 23 27

23 32 40 21 28 35 27 36 42 25 31 38

28 38 48 26 34 44 33 43 51 30 38 47

71902CV 7002CV 7202CG1 71902HV 7002HV 7202HG1

2.18 2.06 1.98 1.05 1.00 0.97

5 7 10 8 12 17

16 23 29 25 36 50

32 45 61 50 72 99

4 5 6 10 12 14

7 9 9 15 18 21

9 12 13 20 25 28

24 28 34 21 25 30

34 39 46 30 35 41

41 48 56 37 43 51

71903CV 7003CV 7203CG1 71903HV 7003HV 7203HG1

2.08 1.87 1.81 1.00 0.91 0.92

6 8 14 9 14 20

17 24 38 27 38 63

34 47 79 54 77 126

5 5 7 11 13 16

7 9 11 16 20 24

10 13 16 22 26 32

26 32 37 23 29 32

36 44 50 32 39 45

45 54 62 40 49 55

71904CV 7004CV 7204CG1 71904HV 7004HV 7204HG1

1.79 1.65 1.58 0.87 0.81 0.80

8 14 19 12 23 32

25 41 59 38 68 92

50 81 113 77 135 185

6 7 9 14 18 20

10 13 15 21 27 31

14 19 21 28 37 43

33 42 46 29 37 41

47 58 64 42 52 56

58 70 77 52 64 69

71905CV 7005CV 7205CG1 71905HV 7005HV 7205HG1

1.64 1.50 1.45 0.80 0.74 0.72

9 16 23 14 25 34

27 45 68 41 72 101

54 90 135 81 144 203

7 9 10 16 20 23

11 15 17 24 30 36

15 21 25 31 41 49

38 48 55 33 43 47

53 66 77 47 59 66

65 81 93 58 73 81

71906CV 7006CV 7206CG1 71906HV 7006HV 7206HG1

1.59 1.43 1.33 0.77 0.70 0.68

9 19 29 14 29 45

27 56 86 43 90 135

54 113 171 86 180 270

7 10 11 16 22 26

11 16 18 25 34 40

16 24 26 33 46 54

40 55 64 34 48 56

55 77 88 50 68 78

68 94 106 61 83 95

71907CV 7007CV 7207CG1 71907HV 7007HV 7207HG1

1.45 1.30 1.32 0.70 0.63 0.65

12 23 41 20 38 63

37 68 119 59 113 189

74 135 225 117 225 383

8 11 14 20 27 32

14 19 23 30 41 49

19 27 32 40 55 67

47 64 75 43 58 66

66 90 104 59 81 93

81 109 124 73 100 115

(1) Axial deflection constant in µm (lbf)-2/3

7 = light preload

8 = medium preload

9 = heavy preload

Symbol

Deflection constant

Preload (Ibf)

Axial rigidity (Ibf/µm)

Radial rigidity (Ibf/µm)

K (1)

71908CV 7008CV 7208CG1 71908HV 7008HV 7208HG1

1.29 1.25 1.37 0.63 0.61 0.67

17 25 42 27 41 68

52 74 126 81 119 203

104 149 248 162 248 405

10 12 13 25 28 32

17 20 22 38 43 48

25 29 31 51 60 65

59 69 75 52 61 67

82 96 105 73 86 95

100 117 127 90 107 117

71909CV 7009CV 7209CG1 71909HV 7009HV 7209HG1

1.20 1.24 1.33 0.59 0.61 0.63

18 29 52 27 47 83

52 90 158 81 146 248

104 180 315 162 293 495

11 14 16 26 32 38

18 24 27 39 50 58

25 34 38 52 68 78

61 75 89 54 66 79

85 113 128 76 97 113

105 141 160 95 123 142

71910CV 7010CV 7210CG1 71910HV 7010HV 7210HG1

1.13 1.15 1.29 0.55 0.56 0.61

18 32 54 27 50 86

52 95 162 83 151 257

104 189 324 167 299 513

11 14 17 27 33 40

18 25 28 41 52 61

26 36 40 54 70 82

63 80 94 56 68 83

87 118 134 79 101 119

108 150 167 99 127 149

71911CV 7011CV 7211CG1 71911HV 7011HV 7211HG1

1.08 1.12 1.20 0.53 0.55 0.57

20 41 72 34 63 113

63 108 180 99 162 281

126 234 360 198 338 563

12 16 18 29 38 42

20 25 27 43 54 60

27 37 39 58 73 80

83 90 101 73 79 89

111 121 133 99 106 118

138 151 163 122 133 146

71912CV 7012CV 7212CG1 71912HV 7012HV 7212HG1

1.03 1.05 1.15 0.50 0.51 0.56

23 45 90 34 72 135

68 122 225 104 180 338

135 261 450 207 383 675

13 18 20 31 42 47

21 28 31 47 60 66

30 41 43 62 82 88

90 100 113 80 88 98

120 135 149 107 118 130

150 167 181 133 148 160

71913CV 7013CV 7213CG1 71913HV 7013HV 7213HG1

0.97 1.01 1.09 0.48 0.50 0.52

34 50 95 54 77 140

90 126 236 135 194 349

194 275 473 284 394 698

17 19 21 41 44 49

27 29 33 59 63 70

41 43 46 80 85 93

97 106 120 86 93 104

131 141 158 115 124 138

163 176 193 144 154 170

71914CV 7014CV 7214CG1 71914HV 7014HV 7214HG1

0.98 0.99 1.11 0.48 0.49 0.53

45 63 104 70 95 162

117 162 259 180 248 405

252 349 518 369 506 810

19 21 22 44 48 51

29 32 33 64 70 72

44 48 47 86 94 96

106 117 122 93 102 107

140 156 161 125 138 143

176 194 197 156 171 176

71915CV 7015CV 7215CG1 71915HV 7015HV 7215HG1

0.93 0.96 1.07 0.46 0.47 0.51

50 68 108 77 104 167

131 171 270 194 261 416

275 371 540 405 540 833

21 22 23 48 52 54

32 34 35 69 74 76

47 51 49 94 99 101

115 124 130 101 108 114

154 164 171 135 145 151

191 205 209 169 180 187

MachLine®: ranges High Precision - Standard Preload, axial and radial rigidity of DU DB DF arrangements Symbol

Deflection constant

Preload (Ibf)

Axial rigidity (Ibf/µm)

K (1)

71916CV 7016CV 7216CG1 71916HV 7016HV 7216HG1

0.91 0.97 1.03 0.45 0.47 0.50

50 86 131 81 135 198

135 225 326 203 338 495

288 484 653 416 709 990

21 24 25 50 56 59

34 37 38 72 80 83

50 55 54 97 109 110

118 134 142 106 119 124

160 180 188 141 158 165

199 224 230 176 198 204

71917CV 7017CV 7217CG1 71917HV 7017HV 7217HG1

0.88 0.93 1.01 0.43 0.46 0.49

63 90 149 95 140 225

162 239 371 243 360 563

349 506 743 506 743 1,125

24 25 27 54 59 63

37 39 41 79 85 89

54 58 58 106 114 118

132 141 153 115 124 133

175 189 201 154 167 177

218 235 246 193 208 218

71918CV 7018CV 7218CG1 71918HV 7018HV 7218HG1

0.84 0.93 1.00 0.41 0.45 0.47

68 108 171 104 167 261

171 284 428 261 428 653

371 608 855 540 889 1,305

25 27 29 59 63 68

39 42 44 84 90 96

58 62 62 114 122 127

141 151 164 124 132 143

187 202 216 166 177 191

234 251 265 206 221 235

71919CV 7019CV 71919HV 7019HV

0.84 0.90 0.41 0.44

72 113 117 176

194 297 293 450

416 630 608 934

26 28 62 66

41 44 88 95

61 64 119 128

145 158 130 139

196 212 173 187

244 263 216 233

71920CV 7020CV 7220CG1 71920HV 7020HV 7220HG1

0.82 0.87 0.99 0.40 0.43 0.48

86 117 207 135 185 315

225 315 518 338 473 788

484 664 1,035 709 979 1,575

28 29 31 66 69 72

44 46 47 94 99 102

65 68 66 128 134 135

157 165 174 139 146 152

211 222 230 186 196 203

263 276 282 232 244 250

71921CV 7021CV 71921HV 7021HV

0.80 0.86 0.39 0.42

90 131 140 207

234 349 360 529

495 743 731 1,091

29 31 68 73

46 49 99 105

67 72 133 142

164 174 144 154

219 234 194 207

271 291 241 257

71922CV 7022CV 7222CG1 71922HV 7022HV 7222HG1

0.78 0.86 0.96 0.38 0.42 0.46

95 153 243 144 239 374

243 405 608 371 608 934

720 855 1,215 765 1,260 1,868

31 33 34 71 77 79

47 51 51 102 110 112

70 75 71 138 149 148

170 183 192 149 161 167

227 246 253 201 216 223

281 305 310 250 270 276

71924CV 7024CV 7224CG1 71924HV 7024HV 7224HG1

0.77 0.80 0.89 0.37 0.39 0.42

126 167 257 198 261 387

329 439 641 495 675 968

698 945 1,283 1,035 1,384 1,935

34 36 37 80 84 87

53 56 56 114 121 123

78 83 78 155 163 162

191 200 214 169 177 185

255 269 283 225 238 248

317 335 347 281 296 306

(1) Axial deflection constant in µm (lbf)-2/3

7 = light preload

Radial rigidity (Ibf/µm)

8 = medium preload

9 = heavy preload

Symbol

Deflection constant

Preload (Ibf)

Axial rigidity (Ibf/µm) 9

Radial rigidity (Ibf/µm)

K (1)

71926CV 7026CV 71926HV 7026HV

0.76 0.81 0.37 0.40

149 212 234 333

394 551 596 844

844 1,181 1,238 1,744

37 38 86 90

57 60 123 123

85 88 167 175

205 216 181 191

275 289 243 255

342 359 303 318

71928CV 7028CV 71928HV 7028HV

0.72 0.76 0.35 0.37

162 234 257 371

428 608 653 934

900 1,305 1,339 1,924

40 42 93 100

62 66 133 142

90 97 180 192

221 237 196 210

296 317 262 281

367 395 326 349

71930CV 7030CV 71930HV 7030HV

0.70 0.74 0.34 0.36

198 270 311 428

518 709 788 1,091

1,091 1,508 1,631 2,228

44 45 102 107

68 71 147 153

100 104 198 207

244 255 216 226

326 342 289 302

404 425 360 376

71932CV 7032CV 71932HV 7032HV

0.68 0.73 0.33 0.36

207 311 324 484

540 810 821 1,238

1,148 1,721 1,699 2,621

45 49 106 114

71 76 152 164

104 111 206 221

253 273 224 241

339 366 299 323

420 454 373 403

71934CV 7034CV 71934HV 7034HV

0.65 0.71 0.32 0.35

221 349 349 551

574 923 878 1,406

1,215 1,958 1,823 2,914

48 52 114 122

75 81 162 175

110 119 220 236

270 290 239 257

361 390 320 345

448 484 399 430

71936CV 7036CV 71936HV 7036HV

0.65 0.71 0.32 0.35

270 450 416 698

709 1,159 1,080 1,789

1,496 2,464 2,216 3,679

52 56 121 131

81 87 174 189

119 127 235 254

289 315 254 277

387 420 343 372

480 522 426 463

71938CV 7038CV 71938HV 7038HV

0.62 0.69 0.31 0.34

288 473 450 743

754 1,226 1,148 1,879

1,586 2,588 2,374 3,870

55 59 129 138

86 91 186 198

126 133 251 267

309 331 272 292

413 441 365 390

511 547 455 486

71940CV 7040CV 71940HV 7040HV

0.65 0.69 0.32 0.34

371 540 585 855

979 1,418 1,485 2,171

2,048 3,004 3,060 4,478

58 62 136 145

90 96 194 208

132 140 265 281

323 347 286 306

433 464 383 411

536 576 477 511

71944CV 7044CV 71944HV 7044HV

0.61 0.65 0.30 0.32

383 608 596 956

990 1,620 1,519 2,453

2,093 3,465 3,116 5,063

63 68 146 160

97 107 210 231

143 158 283 312

350 383 308 338

466 515 414 454

578 640 514 565

71948CV 71948HV

0.58 0.28

405 641

1,058 1,631

2,250 3,353

67 157

104 225

153 303

372 329

497 441

617 549

MachLine速: ranges High Speed and Sealed - ML & MLE Series 719 / 70 Dimensions

Weight

Series

Ibs

22 26

6 8

0.022 0.040

ML ML

24 28

6 8

0.024 0.044

28 32

7 9

30 35

20 25

Hole for lubrication

Shoulders and fillets (mm)

Balls

Diam.

71900 7000

17.2 19.5

13.3 14.2

13.6 14.7

17.8 20.1

0.3 0.3

0.1 0.1

14.4 15.7

1.05 1.53

2.381 3.175

14 11

ML ML

71901 7001

19.0 21.5

15.1 16.2

15.4 16.7

19.6 22.1

0.3 0.3

0.1 0.1

16.2 17.7

1.05 1.58

2.381 3.175

14 13

0.033 0.062

ML ML

71902 7002

23.3 25.7

18.3 19.4

18.7 20.2

23.7 26.8

0.3 0.3

0.1 0.1

19.7 21.3

1.35 1.85

2.778 3.969

16 13

7 10

0.037 0.082

ML ML

71903 7003

25.6 28.4

20.6 22.0

21.0 22.7

26.0 29.5

0.3 0.3

0.1 0.1

22.0 23.9

1.35 1.85

2.778 3.969

18 15

37 42

9 12

0.079 0.139

ML ML

71904 7004

30.7 34.3

24.5 25.3

25.1 26.6

31.8 35.7

0.3 0.6

0.2 0.3

26.3 27.9

1.75 2.63

3.969 5.556

16 14

42 47 47 55

9 12 9 13

0.090 0.168 0.104 0.247

ML ML ML ML

71905 7005 71906 7006

36.2 39.9 40.7 45.8

30.0 30.9 34.5 36.8

30.6 32.2 35.1 38.1

37.3 41.3 41.8 47.2

0.3 0.6 0.3 1.0

0.2 0.3 0.2 0.3

31.8 33.5 36.2 39.4

1.75 2.63 1.73 2.63

3.969 5.556 3.969 5.556

19 17 22 20

55 62

10 14

0.165 0.329

ML ML

71907 7007

47.1 51.5

40.8 41.5

41.4 43.2

48.2 53.6

0.6 1.0

0.2 0.3

42.7 44.6

1.90 3.10

3.969 6.350

26 20

62 68

12 15

0.240 0.408

ML ML

71908 7008

53.1 57.5

45.3 47.5

46.8 49.2

54.4 59.6

0.6 1.0

0.2 0.3

47.6 50.5

2.25 3.00

4.762 6.350

25 22

68 75

12 16

0.282 0.525

ML ML

71909 7009

58.6 63.0

50.8 53.0

52.3 54.7

59.9 65.0

0.6 1.0

0.3 0.3

53.0 56.1

2.23 3.05

4.762 6.350

28 22

72 80

12 16

0.284 0.564

ML ML

71910 7010

63.1 68.0

55.3 58.0

56.8 59.7

64.4 70.0

0.6 1.0

0.3 0.3

57.5 61.0

2.23 3.00

4.762 6.350

30 25

80 90

13 18

0.390 0.873

ML ML

71911 7011

73.8 79.5

60.5 65.5

62.2 66.5

76.0 83.5

1.0 1.1

0.3 0.6

64.3 69.5

2.50 1.70

5.556 7.938

30 22

85 95

13 18

0.419 0.939

ML ML

71912 7012

78.8 84.5

65.6 70.5

67.1 71.5

81.0 88.5

1.0 1.1

0.3 0.6

69.3 74.4

2.50 1.67

5.556 7.938

32 24

90 100

13 18

0.445 0.981

ML ML

71913 7013

83.5 89.5

70.5 74.0

72.5 76.5

86.5 93.5

1.0 1.1

0.3 0.6

75.0 79.4

1.25 1.67

6.350 7.938

29 26

100 110

16 20

0.728 1.378

ML ML

71914 7014

92.0 98.0

76.5 81.5

79.0 83.0

95.5 102.5

1.0 1.1

0.3 0.6

81.9 86.4

1.63 2.07

7.938 9.525

26 24

105 115

16 20

0.770 1.451

ML ML

71915 7015

97.0 103.0

81.5 86.5

84.0 88.0

100.5 107.5

1.0 1.1

0.3 0.6

86.9 91.4

1.63 2.07

7.938 9.525

28 25

110 125

16 22

0.816 1.927

ML ML

71916 7016

102.0 111.5

86.5 93.0

89.0 94.5

105.5 116.5

1.0 1.1

0.3 0.6

91.9 98.4

1.63 2.49

7.938 11.113

30 23

120 130

18 22

1.180 2.044

ML ML

71917 7017

110.0 116.5

93.0 98.5

96.0 99.5

114.0 121.5

1.1 1.1

0.6 0.6

99.2 103.4

1.94 2.49

8.731 11.113

29 25

125 140

18 24

1.239 2.628

ML ML

71918 7018

115.0 124.5

98.5 103.0

101.0 106.5

119.0 130.0

1.1 1.5

0.6 0.6

104.2 110.5

1.94 2.64

8.731 11.906

31 25

130 145

18 24

1.303 2.785

ML ML

71919 7019

120.0 129.5

103.5 109.5

106.0 111.5

124.0 135.0

1.1 1.5

0.6 0.6

109.2 115.5

1.94 2.64

8.731 11.906

32 26

100

140 150

20 24

1.755 2.895

ML ML

71920 7020

128.5 134.5

109.5 114.5

112.5 116.5

133.0 140.0

1.1 1.5

0.6 0.6

115.9 120.5

2.02 2.61

10.319 11.906

29 27

105

160

3.532

7021

143.0

119.0

123.0

149.0

2.0

1.0

127.5

3.02

13.494

110

150 170

20 28

1.914 4.452

ML ML

71922 7022

138.5 150.5

119.5 126.0

122.5 130.0

143.0 149.0

1.1 2.0

0.6 1.0

125.9 134.7

1.98 3.23

10.319 14.288

32 25

120

165 180

22 28

2.655 4.778

ML ML

71924 7024

151.5 160.5

131.0 136.0

134.5 140.0

156.5 167.5

1.1 2.0

6.0 1.0

138.1 144.7

2.18 3.23

11.113 14.288

33 27

130

180 200

24 33

3.466 7.290

ML ML

71926 7026

165.0 177.0

142.0 148.5

146.0 154.0

170.5 185.0

1.5 2.0

0.6 1.0

150.0 158.9

2.56 3.84

12.700 16.669

31 26

r3 r2 E

d D4 d3

d2 D1

gle Contact an

Series 719 CV 70 CV Series C

a (mm)

Basic load values in Ibf

Limit speed in rpm

C Dynamic

Co Static

Grease

Oil

gle Contact an

Series 719 HV 70 HV

17째

Series H

a (mm)

25째

Basic load values in Ibf C Dynamic

Co Static

Limit speed in rpm Grease

Oil

ML 71900 7000 ML

C C

5 6

322 459

680 681

101,500 94,000

135,000 125,000

ML 71900 ML 7000

H H

7 8

306 439

680 681

94,000 82,500

125,000 110,000

ML 71901 7001 ML

C C

5 7

335 513

683 684

90,000 82,500

120,000 110,000

ML 71901 ML 7001

H H

7 9

317 491

683 684

82,500 75,000

110,000 100,000

ML 71902 7002 ML

C C

6 8

457 776

686 687

75,000 69,000

100,000 92,000

ML 71902 ML 7002

H H

9 10

434 743

686 687

67,500 62,500

90,000 83,000

ML 71903 ML 7003

C C

7 8

488 844

689 690

67,500 61,500

90,000 82,000

ML 71903 ML 7003

H H

9 11

464 810

689 690

61,500 55,500

82,000 74,000

ML 71904 ML 7004

C C

8 10

878 1,474

692 693

56,500 52,500

75,000 70,000

ML 71904 ML 7004

H H

11 13

833 1,418

692 693

51,000 47,500

68,000 63,000

ML 71905 7005 ML

C C

9 11

968 1,676

695 696

47,500 44,500

63,000 59,000

ML 71905 7005 ML

H H

12 14

923 1,598

695 696

43,000 40,000

57,000 53,000

ML 71906 ML 7006

C C

10 12

1,046 1,868

698 699

41,500 37,500

55,000 50,000

ML 71906 ML 7006

H H

13 16

990 1,755

698 699

37,500 34,500

50,000 46,000

ML 71907 ML 7007

C C

11 13

1,148 2,363

701 702

35,500 33,000

47,000 44,000

ML 71907 ML 7007

H H

15 18

1,080 2,250

701 702

32,500 30,000

43,000 40,000

ML 71908 ML 7008

C C

13 15

1,564 2,475

704 705

31,500 29,500

42,000 39,000

ML 71908 ML 7008

H H

18 20

1,474 2,363

704 705

28,500 27,000

38,000 36,000

ML 71909 ML 7009

C C

14 16

1,654 2,453

707 708

28,500 27,000

38,000 36,000

ML 71909 ML 7009

H H

19 22

1,564 2,318

707 708

25,500 24,000

34,000 32,000

ML 71910 ML 7010

C C

14 17

1,710 2,633

710 711

26,500 25,000

35,000 33,000

ML 71910 ML 7010

H H

20 23

1,609 2,498

710 711

24,000 22,500

32,000 30,000

ML 71911 ML 7011

C C

16 19

2,273 5,243

713 714

21,000 22,000

31,000 30,500

ML 71911 ML 7011

H H

22 26

2,160 4,950

713 714

18,000 19,000

28,500 27,000

ML 71912 ML 7012

C C

16 19

2,340 5,490

716 717

18,000 19,000

29,500 28,500

ML 71912 ML 7012

H H

24 27

2,205 5,175

716 717

17,500 17,000

26,500 25,500

ML 71913 ML 7013

C C

17 20

3,960 5,738

719 720

19,000 18,000

30,500 27,000

ML 71913 ML 7013

H H

25 28

3,735 5,378

719 720

17,500 16,000

26,000 24,500

ML 71914 ML 7014

C C

19 22

5,625 7,650

722 723

17,000 16,500

27,000 25,000

ML 71914 ML 7014

H H

28 31

5,333 7,200

722 723

15,000 15,000

23,500 21,800

ML 71915 ML 7015

C C

20 23

5,850 7,763

725 726

16,500 15,500

26,000 23,750

ML 71915 ML 7015

H H

29 32

5,535 7,313

725 726

14,000 13,500

21,700 21,000

ML 71916 ML 7016

C C

21 25

6,075 9,900

728 729

15,500 14,000

24,500 21,500

ML 71916 ML 7016

H H

30 35

5,738 9,338

728 729

13,700 12,500

21,000 19,000

ML 71917 ML 7017

C C

23 26

7,088 10,350

731 732

14,500 13,500

22,500 20,500

ML 71917 ML 7017

H H

33 36

6,638 9,788

731 732

12,500 11,500

20,000 18,500

ML 71918 ML 7018

C C

23 28

7,313 11,700

734 735

13,500 12,500

21,000 19,100

ML 71918 ML 7018

H H

34 39

6,863 11,025

734 735

11,700 10,500

18,700 17,200

ML 71919 ML 7019

C C

24 28

7,425 11,925

737 738

12,700 12,000

20,000 18,400

ML 71919 ML 7019

H H

35 40

6,975 11,250

737 738

11,000 10,000

17,700 16,500

ML 71920 ML 7020

C C

26 29

9,563 12,150

740 741

11,700 11,500

18,500 18,000

ML 71920 ML 7020

H H

38 41

9,000 11,475

740 741

10,500 9,500

16,700 15,900

7021

14,625

743

10,500

16,500

7021

13,725

743

9,000

14,900

ML 71922 ML 7022

C C

28 33

10,013 16,200

745 746

10,500 10,000

17,000 15,800

ML 71922 ML 7022

H H

41 47

9,450 15,300

745 746

9,300 8,500

14,700 13,900

ML 71924 ML 7024

C C

30 34

11,700 16,875

748 749

9,500 9,000

15,500 14,000

ML 71924 ML 7024

H H

44 49

11,025 15,750

748 749

8,600 8,000

13,500 12,500

ML 71926 ML 7026

C C

33 39

14,400 21,825

751 752

8,500 8,000

14,000 12,500

ML 71926 ML 7026

H H

48 55

13,500 20,700

751 752

7,500 7,000

11,500 10,500

MachLine®: ranges High Speed and Sealed - ML & MLE Preload, axial and radial rigidity of DU DB DF arrangements Symbol

Deflection constant

Preload (Ibf)

Axial rigidity (Ibf/µm)

Radial rigidity (Ibf/µm)

K (1)

ML ML ML ML

71900 7000 71900 7000

C C H H

2.58 2.33 1.25 1.14

2 2 2 4

5 7 8 11

10 14 16 23

3 3 6 6

4 4 8 9

6 6 11 11

13 14 12 13

19 20 8 18

24 24 22 23

ML ML ML ML

71901 7001 71901 7001

C C H H

2.31 2.19 1.12 1.06

2 2 3 4

5 8 8 12

10 16 16 25

3 3 6 7

4 5 9 10

6 7 11 13

14 16 13 15

20 23 19 21

25 29 23 27

ML ML ML ML

71902 7002 71902 7002

C C H H

2.18 2.06 1.05 1.00

2 4 4 7

7 11 11 18

14 23 23 36

3 4 7 9

5 6 11 12

7 8 14 16

17 20 16 19

24 28 23 26

30 35 29 33

ML ML ML ML

71903 7003 71903 7003

C C H H

2.08 1.87 1.00 0.91

2 4 4 7

8 12 11 20

15 25 23 41

4 5 8 9

6 7 14 14

8 9 15 18

19 23 18 21

27 32 25 30

33 40 31 38

ML ML ML ML

71904 7004 71904 7004

C C H H

1.79 1.65 0.87 0.81

5 8 7 11

14 23 20 36

27 45 41 72

5 6 10 12

7 9 15 18

10 12 19 24

24 30 22 27

34 42 32 39

43 52 39 49

ML ML ML ML

71905 7005 71905 7005

C C H H

1.64 1.50 0.80 0.74

5 8 8 14

15 25 23 41

29 50 45 81

6 7 12 15

9 11 17 22

11 14 22 28

28 34 26 32

40 49 37 46

49 61 46 58

ML ML ML ML

71906 7006 71906 7006

C C H H

1.59 1.43 0.77 0.70

5 9 8 15

16 27 25 45

32 56 50 88

6 8 13 17

10 12 20 25

13 16 25 32

31 40 29 37

45 56 42 54

56 71 52 66

ML ML ML ML

71907 7007 71907 7007

C C H H

1.45 1.30 0.70 0.63

6 11 9 18

18 36 27 56

34 72 54 113

7 9 15 19

11 14 22 28

14 18 29 36

36 45 34 42

52 65 48 60

64 81 60 75

ML ML ML ML

71908 7008 71908 7008

C C H H

1.29 1.25 0.63 0.61

8 12 12 20

23 36 36 59

47 74 74 117

8 10 17 21

12 15 25 30

17 20 33 39

42 49 39 46

59 69 55 65

74 87 69 81

ML ML ML ML

71909 7009 71909 7009

C C H H

1.20 1.22 0.59 0.60

8 12 14 20

25 36 38 59

50 74 79 117

9 10 19 21

14 15 28 30

18 20 36 39

45 49 43 46

65 69 60 65

81 87 76 81

ML ML ML ML

71910 7010 71910 7010

C C H H

1.13 1.14 0.55 0.56

9 14 14 20

25 41 41 63

52 79 81 126

10 11 20 23

14 17 30 34

19 22 38 44

49 55 45 50

68 79 65 73

86 97 80 91

ML ML ML ML

71911 7011 71911 7011

C C H H

1.06 1.15 0.59 0.64

11 16 18 27

34 52 54 83

68 106 108 167

11 11 23 24

17 18 35 36

22 23 45 47

57 57 51 54

80 83 74 77

100 104 93 97

ML ML ML ML

71912 7012 71912 7012

C C H H

1.01 1.08 0.57 0.60

11 18 18 29

36 57 54 89

70 114 110 180

12 12 25 26

18 19 36 39

23 25 47 51

61 62 54 59

86 90 80 84

106 113 99 105

Symbol

Deflection constant

Preload (Ibf)

Axial rigidity (Ibf/µm)

Radial rigidity (Ibf/µm)

K (1)

ML 71913 C ML 7013 C ML 71913 H ML 7013 H

1.03 1.03 0.57 0.57

14 19 20 32

42 61 65 97

83 123 130 194

12 13 24 28

18 21 37 42

24 27 48 55

60 67 54 63

86 98 80 91

107 122 99 114

ML 71914 C ML 7014 C ML 71914 H ML 7014 H

1.04 1.03 0.57 0.57

21 26 29 43

60 81 60 129

119 162 185 261

14 15 28 32

20 23 42 47

27 30 54 61

69 75 62 70

97 108 90 101

121 135 112 127

ML 71915 C ML 7015 C ML 71915 H ML 7015 H

0.98 0.99 0.54 0.55

22 27 31 45

63 85 99 133

127 170 199 270

15 16 30 33

22 24 45 49

29 32 58 63

74 78 66 74

104 113 97 105

129 140 121 132

ML 71916 C ML 7016 C ML 71916 H ML 7016 H

0.94 1.00 0.52 0.56

23 34 33 57

68 107 106 169

135 214 212 338

16 17 32 36

23 26 48 52

31 34 62 68

79 84 71 79

111 121 103 113

138 151 129 141

ML 71917 C ML 7017 C ML 71917 H ML 7017 H

0.90 0.94 0.52 0.52

28 37 39 61

79 116 124 182

158 232 248 365

17 18 34 38

25 28 51 57

33 37 66 74

84 91 76 86

118 132 110 123

147 164 137 153

ML 71918 C ML 7018 C ML 71918 H ML 7018 H

0.89 0.92 0.50 0.51

29 41 42 71

84 128 132 208

168 261 265 423

18 19 36 41

27 29 54 61

35 39 70 79

90 97 81 92

126 140 117 131

157 175 147 165

ML 71919 C ML 7019 C ML 71919 H ML 7019 H

0.87 0.90 0.48 0.50

30 44 43 73

87 137 136 216

173 275 271 439

18 20 37 43

27 31 56 63

36 41 72 82

93 101 83 96

130 146 121 136

162 182 151 171

ML 71920 C ML 7020 C ML 71920 H ML 7020 H

0.87 0.88 0.48 0.49

39 45 55 76

111 141 173 226

221 284 347 452

20 21 40 45

30 32 60 66

39 43 78 85

100 105 90 99

140 152 130 142

174 189 162 177

ML ML

7021 C 7021 H

0.89 0.49

54 90

171 270

342 540

22 47

34 69

45 90

110 104

160 149

199 186

ML 71922 C ML 7022 C ML 71922 H ML 7022 H

0.83 0.87 0.46 0.48

43 60 61 101

122 182 190 299

243 371 381 608

22 23 44 50

33 35 66 73

43 47 86 95

110 116 99 110

154 167 143 157

192 209 179 197

ML 71924 C ML 7024 C ML 71924 H ML 7024 H

0.79 0.83 0.44 0.46

51 65 72 108

145 199 225 324

290 410 450 648

24 25 49 53

36 38 73 79

48 51 95 102

122 126 110 119

171 181 158 170

213 227 198 212

ML 71926 C ML 7026 C ML 71926 H ML 7026 H

0.78 0.81 0.43 0.45

63 84 90 142

178 263 279 423

356 540 558 855

26 28 53 60

39 43 79 88

51 58 102 115

131 141 118 134

184 204 171 191

228 255 213 239

(1) Axial deflection constant in µm (lbf)-2/3

7 = light preload

8 = medium preload

9 = heavy preload

Precision self-locking nuts It is highly recommended that precision self-locking nuts are used whenever MachLine bearings are installed. They can be used to preload a bearing assembly and ensure the preload is maintained over time. When used with large axial loads, the assembly can be reliably positioned to last.

Features - High strength steel (1,000 N/mm2) throughout the range, protected by finish rolling (apart from back face and threads). - Squareness < 2 Âľm between back face / bore. - Metric thread with tolerance 5H (as per ISO 965/1). - Narrow or wide series. - Locking via blind holes or slots. - Nuts locked with 2 or 4 bronze inserts.

Installation precautions As with bearings, wait until the last moment to remove nuts from packaging to avoid contamination risks. Place them on the rolled face. Once the nut has been tightened with a wrench (DIN 1810A SNR offers a full range of wrenches which are solid, secure and easy to use. The 5 dimensions of our wrenches are sufficient to replace the equivalent of 15 conventional fixed models. For more information, visit: www.snr-bearings.com or contact your SNR technician.

and DIN 1810B), tighten the insert fastening screws with an Allen key (4 insert series: tighten gradually in a cross formation). You are advised to replace nuts each time bearings are replaced.

Series with slots

Series with blind holes

Rolled surface

Series Narrow

Number of inserts 2

Wide

Dimensions and part numbers

Blind holes TB

TBR

TBP

BPR

TBPR

Slots

Nuts type B and TB Threads

P/N

Weight

Locking screw

Dimensions

Nuts

D2 _

Mbl

Far

N.m

M8 x 0.75

B 8/0.75

M12 x 1

B 12/1

M15 x 1

B 15/1

M17 x 1

B 17/1

M20 x 1

B 20/1

M20 x 1.5

0.01

0.015

0.02

0.03

100

TB 20/1

0.04

4-5

140

B 20/1.5

TB 20/1.5

0.04

4-5

126

M25 x 1.5

B 25

TB 25

0.06

4-5

198

M30 x 1.5

B 30

TB 30

0.08

4-5

240

M35 x 1.5

B 35

TB 35

0.11

4-5

263

M40 x 1.5

B 40

TB 40

0.15

8-10

290

M45 x 1.5

B 45

TB 45

0.18

8-10

322

115

M50 x 1.5

B 50

TB 50

0.20

8-10

351

132

M55 x 2

B 55

TB 55

0.25

16-18

378

148

M60 x 2

B 60

TB 60

0.27

16-18

405

100

186

M65 x 2

B 65

TB 65

0.28

16-18

431

120

196

M70 x 2

B 70

TB 70

0.38

16-18

468

130

228

M75 x 2

B 75

TB 75

0.42

16-18

497

150

255

M80 x 2

B 80

TB 80

0.49

105

16-18

527

160

291

M85 x 2

B 85

TB 85

0.52

110

100

16-18

558

190

315

M90 x 2

B 90

TB 90

0.75

120

110

16-18

603

200

369

M95 x 2

B 95

TB 95

0.78

125

115

16-18

637

220

391

M100 x 2

B 100

TB 100

0.82

130

120

16-18

688

250

432

_ _ _

Nuts type BP and TBP Threads D2 _

P/N

Weight

Locking screw

Dimensions

Nuts

Mbl

Far

N.m

M20 x 1

BP 20/1

TBP 20/1

0.12

4-5

255

M20 x 1.5

BP 20/1.5

TBP 20/1.5

0.12

4-5

225

M25 x 1.5

BP 25

TBP 25

0.17

8-10

405

M30 x 1.5

BP 30

TBP 30

0.24

8-10

491

M35 x 1.5

BP 35

TBP 35

0.28

8-10

560

M40 x 1.5

BP 40

TBP 40

0.29

16-18

585

M45 x 1.5

BP 45

TBP 45

0.37

16-18

641

115

M50 x 1.5

BP 50

TBP 50

0.46

16-18

706

132

M55 x 2

BP 55

TBP 55

0.92

16-18

940

148

M60 x 2

BP 60

TBP 60

1.14

16-18

1,070

100

186

M65 x 2

BP 65

TBP 65

1.29

105

16-18

1,155

120

196

M70 x 2

BP 70

TBP 70

1.49

110

16-18

1,230

130

228

M75 x 2

BP 75

TBP 75

2.25

125

M10

30-32

1,300

150

255

M80 x 2

BP 80

TBP 80

2.97

140

M10

30-32

1,420

160

291

M85 x 2

BP 85

TBP 85

3.44

150

100

M10

30-32

1,510

190

315

M90 x 2

BP 90

TBP 90

3.59

155

110

M10

30-32

1,596

200

369

M95 x 2

BP 95

TBP 95

3.73

160

115

M10

30-32

1,656

220

391

M100 x 2

BP 100

TBP 100

3.70

160

120

M10

30-32

1,780

250

432

Far: Axial breaking load (corresponds to thread failure). In operation, a nut should support less than 75 % of axial breaking load Far specified for this nut / Ma: Nut installation torque / Md: Nut untightening torque (installed with corresponding torques Ma and Mbl) / Mbl: Insert tightening torque / D1: Outside diameter / D3: Back face diameter / L1: Width

Precision self-locking nuts Dimensions and part numbers Nuts type BR and TBR Threads

P/N

Weight

Locking screw

Dimensions

Nuts

Mbl

Far

N.m

M25 x 1.5

BR 25

TBR 25

0.06

3-4

198

M30 x 1.5

BR 30

TBR 30

0.08

3-4

240

M35 x 1.5

BR 35

TBR 35

0.11

3-4

263

107

M40 x 1.5

BR 40

TBR 40

0.15

6-8

290

127

M45 x 1.5

BR 45

TBR 45

0.18

6-8

322

149

M50 x 1.5

BR 50

TBR 50

0.20

6-8

351

180

M55 x 2

BR 55

TBR 55

0.25

12-14

378

206

M60 x 2

BR 60

TBR 60

0.27

12-14

405

100

255

M65 x 2

BR 65

TBR 65

0.28

12-14

431

120

277

M70 x 2

BR 70

TBR 70

0.38

12-14

468

130

304

M75 x 2

BR 75

TBR 75

0.42

12-14

497

150

357

M80 x 2

BR 80

TBR 80

0.49

105

12-14

527

160

396

M85 x 2

BR 85

TBR 85

0.52

110

100

12-14

558

190

444

M90 x 2

BR 90

TBR 90

0.75

120

110

12-14

603

200

501

M95 x 2

BR 95

TBR 95

0.78

125

115

12-14

637

220

550

M100 x 2

BR 100

TBR 100

0.82

130

120

12-14

688

250

603

D2 _

Nuts type BPR and TBPR Threads D2 _

P/N

Weight

Locking screw

Dimensions

Nuts

Mbl

Far

N.m

M20 x 1

BPR 20/1

TBPR 20/1

0.12

3-4

255

M20 x 1.5

BPR 20/1.5

TBPR 20/1.5

0.12

3-4

225

M25 x 1.5

BPR 25

TBPR 25

0.17

6-8

405

M30 x 1.5

BPR 30

TBPR 30

0.24

6-8

491

M35 x 1.5

BPR 35

TBPR 35

0.28

6-8

560

107

M40 x 1.5

BPR 40

TBPR 40

0.29

12-14

585

127

M45 x 1.5

BPR 45

TBPR 45

0.37

12-14

641

149

M50 x 1.5

BPR 50

TBPR 50

0.46

12-14

706

180

M55 x 2

BPR 55

TBPR 55

0.92

12-14

940

206

M60 x 2

BPR 60

TBPR 60

1.14

12-14

1,070

100

255

M65 x 2

BPR 65

TBPR 65

1.29

105

12-14

1,155

120

277

M70 x 2

BPR 70

TBPR 70

1.49

110

12-14

1,230

130

304

M75 x 2

BPR 75

TBPR 75

2.25

125

M10

24-26

1,300

150

357

M80 x 2

BPR 80

TBPR 80

2.97

140

M10

24-26

1,420

160

396

M85 x 2

BPR 85

TBPR 85

3.44

150

100

M10

24-26

1,510

190

444

M90 x 2

BPR 90

TBPR 90

3.59

155

110

M10

24-26

1,596

200

501

M95 x 2

BPR 95

TBPR 95

3.73

160

115

M10

24-26

1,656

220

550

M100 x 2

BPR 100

TBPR 100

3.70

160

120

M10

24-26

1,780

250

603

Summary of ranges: find the appropriate SNR solution

Series ISO 02

Ø 10 > 120 mm

Ø 10 > 130 mm

Series ISO 19

Ø 10 > 130 mm

150

Ø 10 > 130 mm

200

Seals

Series ISO 10

Ø 10 > 130 mm

250

High Speed

Ø 10 > 220 mm

Bore Ø mm

Ø 10 > 240 mm

MachLine range

Standard

Seals

High Speed

Standard

100

0 Symbol system

Series

7000 Standard Standard

ML 7000

MachLine

MLE 7000 MachLine Etanche

71900

ML 71900

Etanche Standard MachLine MachLine MachLine MachLine MachLine EtancheStandard Hybride (bille céramique) Standard Hybride (bille céramique) Hybride (bille céramique)

MachLine MachLine

MLE 71 900

7200

MachLine Etanche MachLine Etanche MachLine Etanche Hybride Standard (bille céramique) Hybride (bille céramique) Hybride (bille céramique)

MachLine

Hybrid

Standard

CH 7000

Standard Standard

MLCH 7000 MachLine

MachLine

MLECH 7000Etanche Standard CH 71900 MachLine MachLine MachLine Etanche Etanche Standard

MLCH 71900 MLECH 71900 CH 7200 MachLine Etanche MachLine Etanche MachLine Etanche

MachLine MachLine MachLine Standard Hybride (bille céramique) Hybride (bille céramique) Hybride (bille céramique)

Standard Hybride (bille céramique) Hybride (bille céramique) Hybride (bille céramique)

Range of precision nuts Series

Number of inserts

Blind holes

Application

Bore

TBR

Medium load: maximum flatness required

25 to 100

TBP

High loads

20 to 100

Very high loads: maximum flatness required

20 to 100

2 Narrow

Wide

Slots

BPR

TBPR

8 to 100

Normal use

20 to 100

Specific nuts can be manufactured on request (diameter, number of inserts, etc.)

Tolerances and precision classes

Ring tolerance Spindle precision in rotation has a direct influence

rings in very high precision class P4S and super

on machining precision. SNR manufactures bea-

precision class ISO 2.

Inner ring

s in µm Tolerance Exclusive

120

150

180

Inclusive

120

150

180

250

Bore (d) in mm

Tolerances

Symbol (1)

ISO 4

Tolerance on mean

-4

-5

-6

-7

-8

-10

-12

∆ dmp

diameter ISO 2

-2.5

-4

-5

-7

-8

Series 719

ISO 4

max. Vdp

ISO 2

2.5

Roundness Series 70-72

Taper

Radial run-out Face run-out with respect to bore Raceway run-out with respect to face Tolerance on bearing width

max. Vdmp

max. Kia

max. Sd

max. Sia

∆ Bs

Alignment of faces

max. VBs

ISO 4

ISO 2

2.5

ISO 4

2.5

3.5

ISO 2

1.5

2.5

3.5

ISO 4

2.5

ISO 2

1.5

2.5

ISO 4

ISO 2

1.5

2.5

ISO 4

ISO 2

1.5

2.5

ISO 4

ISO 2

-40

-80

-120

-150

-200

-250

-300

ISO 4

2.5

ISO 2

1.5

2.5

(1) Symbols for tolerances comply with standard ISO 492

Equivalence of precision standards Quality

ISO

ABEC

DIN

2: dynamic 4: dimensional

9: dynamic 7: dimensional

P2: dynamic P4: dimensional

High precision Very high precision P4S (SNR Standard) Super precision

g Outer rin

s in µm Tolerance Exclusive 2.5

120

150

180

250

Inclusive

120

150

180

250

315

400

Outside diameter (D) in mm

Tolerances

Symbol (1)

ISO 4

Tolerance on mean

-4

-5

-6

-7

-8

-9

-10

-11

-13

-15

∆ Dmp

diameter ISO 2

-2.5

-4

-5

-7

-8

-10

Series 719

ISO 4

max. VDp

ISO 2

2.5

ISO 4

ISO 2

2.5

ISO 4

2.5

3.5

ISO 2

1.5

2.5

3.5

Roundness Series 70-72

Taper

Radial run-out

Face run-out with respect to bore

Raceway run-out with respect to face Tolerance on bearing width Alignment of faces

max. VDmp

max. Kea

max. SD

max. Sea

∆ Cs

max. VCs

ISO 4

ISO 2

1.5

2.5

ISO 4

ISO 2

1.5

2.5

ISO 4

ISO 2

1.5

2.5

ISO 4

Identical values to those of the bearing inner ring

ISO 2 ISO 4

2.5

ISO 2

1.5

2.5

(1) Symbols for tolerances comply with standard ISO 492

Tolerances and precision classes

Bearing seat tolerances In order not to alter preloading or damage rotational accuracy, seats must be very close to bearing dimensions. In general, we recommend the fits specified below. When installing the bearings, we advise matching them with their seats to avoid assembling parts at the extremes of their tolerance limits, which can only lead to excessive clearance or tight fit. Tolerances in microns Shaft Nominal diameter (mm)

ISO4

Housing ISO2

ISO4

ISO2

Fixed assembly

Floating assembly Play (4)

Fixed assembly

Floating assembly

JS4

h4 (1)

js4(2)

JS5(1)

K5(2)

H5(3)

10 to 18

0 -5

+3 -3

0 -4

> 18 to 30

0 -6

+3 -3

0 -4

+4 -4

+1 -8

+9 0

2 to 10

+3 -3

+8 +2

> 30 to 50

0 -7

+4 -4

0 -5

+5 -5

+2 -9

+11 0

3 to 11

+4 -4

+10 +2

> 50 to 80

0 -8

+4 -4

0 -5

+6 -6

+3 -10

+13 0

3 to 12

+4 -4

+11 +3

> 80 to 120

0 -10

+5 -5

0 -6

+7 -7

+2 -13

+15 0

5 to 15

+5 -5

+13 +3

> 120 to 180

0 -12

+6 -6

0 -8

+9 -9

+3 -15

+18 0

5 to 17

+6 -6

+16 +4

> 180 to 250

0 -14

+7 -7

0 -10

+10 -10

+2 -18

+20 0

7 to 22

+7 -7

+18 +4

> 250 to 315

+11 -11

+3 -20

+23 0

7 to 27

+8 -8

+21 +5

> 315 to 400

+12 -12

+3 -22

+25 0

7 to 30

+9 -9

+23 +5

(1) Light load C/P > 16, Medium load 10 C/P 16 (2) Heavy load C/P < 10 or high speed applications (ML range) (3) We recommend a tolerance, but the optimum fitting is obtained by matching the housing and bearings within the tolerance limits specified in column (4)

Shape and position tolerances for shoulders and seats Spindle performance (rotational accuracy, heat level)

these characteristics must be within the tolerances

depends to a large extent on the manufacturing

recommended by SNR.

quality of seats and their shoulders. To meet targets,

SHOULDER

Seating d2

Seating d1

Surface roughness (Ra) Seat T5

0.8

1.2

The shoulder diameter and fillet radii with the shaft seat and housing are specified on p. 40.

Seating D2

Seating D1

0.5

Shoulder 0.8

SHOULDER

Maximum tolerances in microns Nominal diameter of seat (mm)

Shaft T1

Housing

ISO 4

ISO 2

ISO 4

ISO 2

ISO 4

ISO 2

ISO 4

ISO 2

ISO 4

ISO 2

ISO 4

ISO 2

10 to 18

1.5

1.2

0.013L(1)

0.008L(1)

> 18 to 30

2.5

1.5

0.013L(1)

0.008L(1)

1.5

2.5

1.5

0.015L(1) 0.010L (1)

> 30 to 50

1.5

2.5

1.5

0.013L(1)

0.008L(1)

2.5

1.5

2.5

1.5

0.015L(1) 0.010L (1)

> 50 to 80

2.5

1.5

0.013L(1)

0.008L(1)

0.015L(1) 0.010L (1)

> 80 to 120

2.5

0.025L(1)

0.013L(1)

3.5

2.5

0.030L(1)

0.015L(1)

> 120 to 180

3.5

0.025L(1)

0.013L(1)

4.5

3.5

0.030L(1)

0.015L(1)

> 180 to 250

2.5

4.5

0.025L(1)

0.013L(1)

3.5

4.5

0.030L(1)

0.015L(1)

> 250 to 315

0.030L(1)

0.015L(1)

> 315 to 400

4.5

0.030L(1)

0.015L(1)

(1) L = distance between bearing units in mm

Tolerances and precision classes

Component tolerances spacers and clamping nuts Rotational accuracy of the spindle also depends on manufacturing precision of spacers and nuts.

Spacers

Clamping nuts L1

B Ă&#x2DC; Bearing seat dia.

Spacers must be rigid enough to avoid any bending

Whether the nut is threaded or pressed on, its

during tightening. They should be no longer than

clamping face must be perpendicular to the bearing

200 mm. Tolerances for their alignment and length

seat. The axial run-out tolerance of the face is

differences are specified below.

specified below.

Maximum tolerances in microns Nominal bore of spacer or nominal diameter of bearing seat (mm)

ISO4

ISO2

ISO4

ISO2

ISO4

ISO2

10 to 18

> 18 to 30

> 30 to 50

> 50 to 80

> 80 to 120

> 120 to 180

> 180 to 250

Spacer

Nut Difference in length between L1 and L2

Maintenance and services

• Storage • Assembly

62 63-66

Maintenance is a major issue, particularly for

• Vibratory analysis

heavily used components such as bearings.

• Expert analysis, training

It has an influence on productivity, occupational health and safety, and the environment. Maintenance is a risk avoidance operation based most of all on human know-how. Our teams will talk you through their expertise over the course of this chapter…

Storage: rules to follow

Every SNR bearing undergoes a specific packaging process in order to ensure its original qualities are maintained during storage. Spindle results in the long-term will be dependent on the precautions taken on installation.

SNR packaging process and bearing protection - The final protective elements are a heat-sealed

- Assembly is carried out in a dust-free air-conditioned

protective bag and a packing box.

environment. - High covering power anti-oxidant protective oil is applied in a controlled atmosphere. This protection is compatible with all currently-used lubricants.

Normal storage conditions - General cleanliness. - Free of dust and corrosive atmospheric conditions. - Recommended temperature: 64째 to 68째F. - Maximum relative humidity: 65 %. For exceptional climatic conditions, specific packaging will be necessary (e.g.: specific packaging for tropical countries). - Do not store on wooden shelves. - Keep at least 30 cm from ground, walls and heating pipework. - Avoid exposure to the sun. - Store boxes flat and do not stack to high. - Lay out boxes so bearing part number is visible without handling.

Storage time Thanks to their standard unit packaging, SNR bearings

The packaging must not be opened, altered or

can have long storage times and the normal storage

damaged.

conditions.

Installation: rules to follow

General installation precautions Spindle should be assembled in clean, well-lit area away from manufacturing sites, in order to avoid risk of contamination. Do not remove bearings from their box until they are to be installed. Do not wash bearings under any circumstances.

Pre-installation checks

The bearing must be stored in its original packaging and not opened until the time of use.

Dimensions and tolerances of components making up the spindle must first be checked (see pages 58 to 60). All components must be carefully washed and dried before installation.

Bearing installation Products used for bearing protection are compatible with all SNR-recommended lubricants.

Bearing seats must be coated with an anti-corrosive product. SNR recommends the use of an assembly paste.

Selection of outside diameter and bore dimensions To obtain as uniform as possible preload and an

Outside diameter and bore dimensions are marked

external load distributed evenly as possible between

on the package and dimension selection need not

all bearings in an arrangement, it is recommended

involve removing bearing from box.

that there should be almost identical interferences or clearances between these bearings and their supports (shaft and housing).

Installation: rules to follow

Lubrication - Grease must be injected using a graduated syringe.

same type as used in the system. This precaution

- SNR can supply pre-greased bearings (suffix D or

will avoid dry start-up which could seriously damage bearings.

sealed bearings MLE). - For oil-based lubrication, inject some oil of the

Define appropriate lubrication method: see page 25. For grease lubrication, follow recommended volumes (page 26).

Bearing positioning - Arrangement of matched bearings:

- Universal bearings and pairs of universal

- An arrangement is inseparable and must not be

bearings: Pay attention to bearing position

mixed.

according to contact angles to obtain the desired

- Find the « V » marked on the outside diameter of

assembly type. For MachLine ML and MLE, use

bearings in order to correctly position bearings

the individual « V » marked on the outer rings.

in the arrangement. - Orientate the tip of « V » in the direction of preferential axial thrust A. - Orienter la pointe du « V »

0.05 to 0.1 mm

Installation - Heat-assisted fitting (expansion) is preferable to any other method. If this is impossible, apply the pressure to the entire parameter of the ring to be fitted. Do not exert any pressure on the other ring because balls must never transmit a forcefitting load. - Fitting by impact (e.g. with a hammer) is strictly prohibited.

Oppose defects - Shaft and/or housing run-out with respect to bearing radial round out. - Spacers. - Line up inner ring high points.

Tightening - Tighten sideplate screws gradually in a cross for-

- Measure radial run-out of spindle nose before and

mation to avoid misaligning the outer ring in the

after locking to check that the shaft has not been

housing.

deformed by tightening. The values should be identical.

Balancing After fitting bearings on shaft, it must be balanced to eliminate any unbalance which could affect correct spindle operation at high speed.

Installation: rules to follow

Run-in procedure Example of run-in cycle of a spindle at 15,000 rpm.

The run-in procedure has a considerable influence on the accuracy of spindle rotation and its service life. The procedure must be carried out in steps,

15,000 rpm. Step 4

T째

depending on the spindle type and temperature rise. The rotation speed of the first step must be at

7,000 rpm. Step 3

a low enough N.Dm (of the order of 105) to be certain 3,500 rpm. Step 2

that the lubrication film is established. Run-in time at each step depends on the time

1,000 rpm. Step 1

required for bearing temperature to stabilise. As soon as the temperature is stabilised, move on to

Time

next step.

Characteristic failures Spalling failures due to material fatigue are

In 70 % of cases failures are linked to lubrication

extremely rare on MachLine spindle bearings.

problems and in 10 % of cases, linked to the sea-

Spindle failures are more characterized by deviation

ling system or a sudden impact between the part

of a certain number of factors observed and mea-

and the tool which can cause damage to spindle

sured on the manufactured components, which

and bearings.

indicate the requirement for spindle maintenance. These factors are: - Difficulties in maintaining dimensions. - Increasing geometrical defects such as circularity or radial run-out. - Poor surface finish. - Unusual surface condition (chatter marks, vibration, etc.). - Abnormal noises in operation.

The bearing itself is rarely the cause of premature failure.

Vibratory analysis: an objective, all-round approach

The whole mechanical environment must be taken into account for maintenance, as interactions between the bearing and other components give useful indications. This all-round approach, based on experience with many different applications, is nevertheless indissociable from objective figures and data, which guarantee neutral diagnostics. This is why SNR uses specialised partners.

SNR and 01dB Metravib Our partnership with this company provides you with specialist expert services in vibratory analysis. Fixed or portable monitoring systems can be designed and implemented to enable predictive maintenance of machine tools. Our vibratory analysis services can help you design: - Monitoring methods, - Monitoring periodicity, - The organisational structure to use, - Results layout and technical-economical studies.

These services are fitted to each individual case. They may involve work or longer-term contracts, and we will never offer more than you need. For more information, contact your SNR technician.

SNR: aeronautical precision made available for machine tools it has now transferred the experience and knowledge acquired in these fields to the area of machine tools. The MachLine range offers high precision bearings suited for extreme speed, sealing and reliability requirements.

www.snr-contact.com

A U T O M O T I V E

A E R O S P A C E

I N D U S T R Y

Siège social: SNR ROULEMENTS - Rue des Usines - 74000 Annecy - FRANCE - RCS Annecy B 325821072 - Code NAF 291H - Code NACE 29.1 www.snr-bearings.com

SNR is a partner in major aeronautical and space programs such as the Airbus A380 or Ariane 5 and