Since 1 955
UNC Unified National Coarse
METRIC (I.S.O.) Nominal dia. mm.
Pitch (P) mm.
Tap drill sizes mm.
M2.0 M2.0 M2.2 M2.2 M2.5 M2.5 M3.0 M3.0 M3.5 M3.5 M4.0 M4.0 M4.5 M4.5 M5.0 M5.0 M6.0 M6.0 M7.0 M7.0 M8.0 M8.0 M8.0 M9.0 M9.0 M9.0 *M10.0 M10.0 M10.0 M11.0 M11.0 M12.0 *M12.0 M12.0 M12.0 M14.0 *M14.0 M14.0 M14.0 M16.0 Ø M16.0 M16.0 M18.0 *M18.0 M18.0 M18.0 M20.0 Ø M20.0 M20.0 M20.0 M22.0 M22.0 M22.0 M22.0 M24.0 M24.0 M24.0 M24.0 Ø M25.0 M25.0 M27.0 M27.0 M28.0 M30.0 M30.0 Ø M32.0 M33.0 M33.0 M36.0 M36.0 M39.0 M39.0 Ø M40.0 M40.0 M42.0 M42.0 M45.0 M45.0 M48.0 M48.0 M52.0 M52.0 M56.0 M56.0 M60.0 M60.0
0.25 0.40 0.25 0.45 0.35 0.45 0.35 0.50 0.35 0.60 0.50 0.70 0.50 0.75 0.50 0.80 0.75 1.00 0.75 1.00 0.75 1.00 1.25 0.75 1.00 1.25 1.00 1.25 1.50 1.00 1.50 1.00 1.25 1.50 1.75 1.00 1.25 1.50 2.00 1.00 1.50 2.00 1.00 1.50 2.00 2.50 1.00 1.50 2.00 2.50 1.00 1.50 2.00 2.50 1.00 1.50 2.00 3.00 1.50 2.00 1.50 3.00 1.50 1.50 3.50 1.50 2.00 3.50 3.00 4.00 3.00 4.00 1.50 3.00 4.00 4.50 4.00 4.50 4.00 5.00 4.00 5.00 4.00 5.50 4.00 5.50
1.75 1.60 1.96 1.75 2.15 2.05 2.65 2.50 3.15 2.90 3.50 3.30 4.00 3.70 4.50 4.20 5.20 5.00 6.20 6.00 7.20 7.00 6.80 8.20 8.00 7.80 9.00 8.80 8.50 10.00 9.50 11.00 10.80 10.50 10.20 13.00 12.80 12.50 12.00 15.00 14.50 14.00 17.00 16.50 16.00 15.50 19.00 18.50 18.00 17.50 21.00 20.50 20.00 19.50 23.00 22.50 22.00 21.00 23.50 23.00 25.50 24.00 26.50 28.50 26.50 30.50 31.00 29.50 33.00 32.00 36.00 35.00 38.50 37.00 38.00 37.50 41.00 40.50 44.00 43.00 48.00 47.00 52.00 50.50 56.00 54.50
*SPARK PLUG PITCHES
Nominal dia.
Threads per inch 64 56 48 40 40 32 32 24 24 40 32 24 24 20 18 16 14 13 12 11 11 10 10 9 8 7 7 6 6 5 4.5
No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 8 No. 10 No. 12 1/8” 5/32” 3/16” 7/32” 1/4” 5/16” 3/8” 7/16” 1/2” 9/16” 5/8” 11/16” 3/4” 13/16” 7/8” 1” 1.1/8” 1.1/4” 1.3/8” 1.1/2” 1.3/4” 2”
UNF Unified National Fine
Tap drill sizes mm. 1.55 1.85 2.10 2.35 2.65 2.85 3.50 3.90 4.50 2.65 3.30 3.80 4.60 5.10 6.60 8.00 9.40 10.80 12.20 13.50 15.25 16.50 18.00 19.50 22.25 25.00 28.00 30.75 34.00 39.50 45.00
Nominal dia.
Threads per inch 80 72 64 56 48 44 40 36 32 28 40 32 32 32 28 24 24 20 20 18 18 16 16 16 14 14 12 12 12 12 12
No. 0 No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 8 No. 10 No. 12 1/8” 5/32” 3/16” 7/32” 1/4” 5/16” 3/8” 7/16” 1/2” 9/16” 5/8” 11/16” 13/16” 3/4” 7/8” 1” 1” 1.1/8” 1.1/4” 1.3/8” 1.1/2”
Tap drill sizes mm. 1.25 1.55 1.90 2.15 1.40 1.70 1.95 3.50 4.10 4.70 2.65 3.30 4.10 4.90 5.50 6.90 8.50 9.90 11.50 12.90 14.50 16.00 17.50 17.50 20.40 23.50 23.25 26.50 29.50 32.75 36.00
BSPT (Rc) British Standard Pipe Taper Nominal dia.
BSW British Standard Whitworth Nominal dia.
Threads per
Tap drill sizes
1/16” 3/32” 1/8” 5/32” 3/16” 7/32” 1/4” 5/16” 3/8” 7/16” 1/2” 9/16” 5/8” 11/16” 3/4” 7/8” 1” 1.1/8” 1.1/4” 1.1/2” 1.3/4” 2”
inch 60 48 40 32 24 24 20 18 16 14 12 12 11 11 10 9 8 7 7 6 5 4.5
mm. 1.20 1.90 2.55 3.20 3.70 4.50 5.10 6.50 7.90 9.30 10.50 12.10 13.50 15.00 16.25 19.25 22.00 24.75 28.00 33.50 39.00 44.50
Threads per inch
Tap drill sizes mm.
No. 0
1.00
5.10
No. 1
0.90
4.50
No. 2
0.81
4.00
No. 3
0.73
3.40
No. 4
0.66
3.00
No. 5
0.59
2.65
No. 6
0.53
2.30
1/8”
Tap drill sizes without Reamer mm. 8.40
1/4”
19
10.80
11.20
No. 7
0.48
2.05
3/8”
19
14.25
14.75
No. 8
0.43
1.80
1.2”
14
17.75
18.25
3/4”
14
23.00
23.75
No. 9
0.39
1.55
1”
11
29.00
30.00
No. 10
0.35
1.40
1.1/4”
11
37.50
38.50
No. 11
0.31
1.20
1.1/2”
11
43.50
44.50
No. 12
0.28
1.05
2”
11
55.00
56.00
No. 13
0.25
0.98
No. 14
0.23
0.80
Nominal dia. 1/8” 1/4” 3/8” 1/2”
Threads per inch 28 19 19 14
Tap drill sizes mm. 8.60 11.50 15.00 18.75
3/4”
14
24.25
1” 1.1/4” 1.1/2”
11 11 11
30.40 39.00 45.00
2”
11
Nominal dia.
Threads per inch 28 19 19 14 14 14 14 11 11 11 11 11
1/8” 1/4” 3/8” 1/2” 5/8” 3/4” 7/8” 1” 1.1/4” 1.1/2” 1.3/4” 2”
56.75
Tap drill sizes mm. 8.80 11.80 15.25 19.00 21.00 24.50 28.25 30.75 39.50 45.00 51.00 57.00
Chisel edge corner
Nominal dia. 1/16” 1/8” 1/4” 3/8” 1/2” 3/4” 1” 1.1/4” 1.1/2” 2”
Threads per inch 27 27 18 18 14 14 11.1/2 11.1/2 11.1/2 11.1/2
Flute
Body
Helix angle
mm. 4.00
7/32”
28
4.60
1/4”
26
5.30
9/32”
26
6.10
5/16”
22
6.80
3/8”
20
8.30
7/16”
18
9.70
1/2”
16
11.10
9/16”
16
12.70
5.8”
14
14.00
11/16”
14
15.50
3/4”
12
16.75
7/8”
11
19.75
1”
10
22.75
1.1/8”
9
25.50
1.1/4”
9
28.50
1.3/8”
8
31.50
1.1/2”
8
34.50
Nominal dia.
Threads Tap per drill sizes inch mm. *1/8” 40 2.55 5/32” 40 3.20 3/16” 40 3.95 7/32” 40 4.75 1/4” 40 5.50 9/32” 32 6.10 5/16” 32 7.00 3/8” 32 8.60 *1/8” ME Tape is identical to 1/8” BSW
Nominal dia.
Threads Tap per drill sizes inch mm. *1/4” 26 5.30 5/16” 26 6.90 3/8” 26 8.40 7/16” 26 10.00 1/2” 26 11.50 5/8” 26 14.70 3/4” 26 17.75 7/8” 26 21.10 1” 26 24.75 *1/4” Brass is identical to 1/4” BSF
Tap drill sizes with without Reamer Reamer 6.10 6.30 8.40 8.70 10.70 11.10 14.25 14.50 17.50 18.00 22.75 23.25 28.50 29.00 37.50 38.00 43.50 44.00 55.00 56.00
NPS American National Straight Pipe Nominal dia.
Threads per inch
Tap drill sizes 75% to 80% full thread
1/8”
27
9.00
1/4”
18
11.50
3/8”
18
15.00
1/2”
14
18.50
3/4”
14
23.75
1”
11.1/2
30.00
1.1/4”
11.1/2
39.00
1.1/2”
11.1/2
45.00
Overall length Chamfer (or taper lead) Flute run out
Land
Body Clearance Cutting Edge
Square
Axis of tap
Flute length
Flute Cutting face
Lip length
inch 32
Land
Heel
Shank
Relative lip height
3/16”
TAP NOMENCLATURE
Drill axis
Rake angle (helix angle at periphery)
Tap drill sizes
Brass Thread
NPT (API) American National Pipe Taper
TWIST DRILL NOMENCLATURE
Lip clearance angle
Threads per
ME Model Engineers
Nominal dia.
Tap drill sizes with Reamer mm. 8.00
BSP PI (Rp)
Nominal dia.
BA British Association
Threads per inch 28
BSPF (G) British Standard Pipe Parallel
BSW British Standard Fine
Thread length Flute length
Lead of helix
Shank diameter
Length of square
Overall length
Lip Flank
Point
Thread relief radial
Point angle
Body clearance diameter
Chisel edge Heel
Flank
Diameter Web or core thickness
Depth of body clearance Chisel edge angle
Heel
Face
Straight Cutting Face Positive Rake
Straight Cutting Face Radial Rake
Curved Cutting Face Positive Rake
Outer Corner
Ø CONDUIT PITCHES
Freephone 0800 4 TOOLS Website WWW.TRADETOOLS.CO.NZ Auckland • Hamilton • Rotorua • Palmerston North • Wellington • Christchurch • Dunedin
Size of square
Since 1 955
GENERAL CONVERSION - FRACTION, MILLIMETRE, GAUGE/LETTER AND INCH Fraction
1/64
1/32
3/64
1/16
5/64
mm .3 .32 .343 .35 .368 .38 .397 .4 .406 .42 .45 .457 .48 .5 .508 .520 .533 .55 .572 .58 .6 .610 .62 .635 .65 .660 .680 .7 .711 .72 .742 .75 .78 .787 .794 .8 .813 .82 .838 .85 .88 .889 .9 .914 .92 .940 .95 .965 .98 .991 1 1.016 1.041 1.05 1.067 1.092 1.1 1.15 1.181 1.191 1.2 1.25 1.3 1.321 1.35 1.397 1.4 1.45 1.5 1.511 1.55 1.588 1.6 1.613 1.65 1.7 1.702 1.75 1.778 1.8 1.85 1.854 1.9 1.930 1.95 1.984 1.994 2.00 2.05 2.057 2.083
Gauge
80 79
78
77
76 75 74
73 72 71
70 69
68
67 66
65 64 63 62 61 60 59 58 57
56
55 54
53
52
51 50
49 48
47
46 45
Inch .0118 .0126 .0135 .0138 .0145 .0150 .0156 .0157 .0160 .0165 .0177 .0180 .0189 .0197 .0200 .0205 .0210 .0217 .0225 .0228 .0236 .0240 .0244 .0250 .0256 .0260 .0268 .0276 .0280 .0283 .0292 .0295 .0307 .0310 .0312 .0315 .0320 .0323 .0330 .0335 .0346 .0350 .0354 .0360 .0362 .0370 .0374 .0380 .0386 .0390 .0394 .0400 .0410 .0413 .0420 .0430 .0433 .0453 .0465 .0469 .0472 .0492 .0512 .0520 .0531 .0550 .0551 .0571 .0591 .0595 .0610 .0625 .0630 .0635 .0650 .0669 .0670 .0689 .0700 .0709 .0728 .0730 .0748 .0760 .0768 .0781 .0785 .0787 .0807 .0810 .0820
Fraction
3/32
7/64
1/8
9/64
5/32
11/64
3/16
13/64
mm 2.1 2.15 2.184 2.2 2.25 2.261 2.3 2.35 2.375 2.381 2.4 2.438 2.45 2.489 2.5 2.527 2.55 2.578 2.6 2.642 2.65 2.7 2.105 2.75 2.778 2.794 2.8 2.819 2.85 2.870 2.9 2.946 2.95 3.00 3.048 3.1 3.175 3.2 3.264 3.3 3.4 3.454 3.5 3.569 3.572 3.6 3.658 3.7 3.734 3.797 3.8 3.861 3.9 3.912 3.969 3.988 4.00 4.039 4.089 4.1 4.2 4.216 4.3 4.305 4.366 4.394 4.4 4.496 4.5 4.572 4.6 4.623 4.7 4.762 4.8 4.851 4.9 4.915 4.978 5.00 5.055 5.1 5.105 5.159 5.182 5.2 5.22 5.3 5.309 5.4 5.41
Gauge
44
43
42
41 40 39 38 37
36
35 34 33 32
31
30
29 28
27 26 25 24 23 22 21 20
19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3
Inch .0827 .0846 .0860 .0866 .0866 .0890 .0906 .0925 .0935 .0938 .0945 .0960 .0965 .0980 .0984 .0985 .1004 .1015 .1024 .1040 .1043 .1063 .1065 .1083 .1094 .1100 .1102 .1110 .1122 .1130 .1142 .1160 .1161 .1181 .1200 .1220 .1250 .1260 .1285 .1299 .1339 .1360 .1378 .1405 .1406 .1417 .1440 .1457 .1470 .1495 .1496 .1520 .1535 .1540 .1562 .1570 .1575 .1590 .1610 .1614 .1654 .1660 .1693 .1695 .1719 .1730 .1732 .1770 .1772 .1800 .1811 .1820 .1850 .1875 .1890 .1910 .1929 .1935 .1960 .1969 .1990 .2008 .2010 .2031 .2040 .2047 .2055 .2087 .2090 .2126 .2130
Fraction 7/32
15/64
1/4
17/64
9/32
19/64
5/16
21/64
11/32
23/64
3/8
25/64
13/32
mm 5.5 5.556 5.6 5.613 5.7 5.791 5.8 5.9 5.944 5.953 6.00 6.045 6.1 6.147 6.2 6.248 6.3 6.350 6.4 6.5 6.528 6.6 6.629 6.7 6.747 6.756 6.8 6.9 6.909 7.00 7.036 7.1 7.137 7.144 7.2 7.3 7.366 7.4 7.493 7.5 7.541 7.6 7.671 7.7 7.8 7.9 7.938 8.00 8.026 8.1 8.2 8.204 8.3 8.334 8.4 8.433 8.5 8.6 8.611 8.7 8.731 8.8 8.839 8.9 9.00 9.093 9.1 9.128 9.2 9.3 9.347 9.4 9.5 9.525 9.576 9.6 9.7 9.8 9.804 9.9 9.922 10.00 10.084 10.1 10.2 10.262 10.3 10.319 10.4 10.490 10.5
Gauge
2 1
A
B C D E
F G
H
I J K
L M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Inch .2165 .2188 .2205 .2210 .2244 .2280 .2283 .2323 .2340 .2344 .2362 .2380 .2402 .2420 .2441 .2460 .2480 .2500 .2520 .2559 .2570 .2598 .2610 .2638 .2656 .2660 .2677 .2717 .2720 .2756 .2770 .2795 .2810 .2812 .2835 .2874 .2900 .2913 .2950 .2953 .2969 .2992 .3030 .3031 .3071 .3110 .3125 .3150 .3160 .3189 .3228 .3230 .3268 .3281 .3307 .3320 .3346 .3386 .3390 .3425 .3438 .3465 .3480 .3504 .3543 .3580 .3583 .3594 .3622 .3661 .3680 .3701 .3740 .3750 .3770 .3780 .3819 .3858 .3860 .3898 .3906 .3937 .3970 .3976 .4016 .4040 .4055 .4062 .4094 .4130 .4134
Fraction
27/64
7/16
29/64
15/32
31/64
1/2
33/64
17/32
35/64
9/16 37/64
19/32 39/64
5/8
41/64 21/32
43/64 11/16
45/64
23/32 47/64
3/4 49/64
25/32 51/64
13/16
53/64 27/32
mm 10.6 10.7 10.716 10.8 10.9 11.00 11.1 11.112 11.2 11.3 11.4 11.5 11.509 11.6 11.7 11.8 11.9 11.906 12.00 12.1 12.2 12.4 12.303 12.4 12.5 12.6 12.7 12.8 12.9 13.00 13.097 13.1 13.2 13.3 13.4 13.494 13.5 13.6 13.7 13.8 13.891 13.9 14.00 14.25 14.288 14.5 14.684 14.75 15.00 15.081 15.25 15.478 15.5 15.75 15.875 16.00 16.25 16.272 16.5 16.669 16.75 17.00 17.066 17.25 17.462 17.5 17.75 17.859 18.00 18.25 18.256 18.5 18.653 18.75 19.00 19.050 19.25 19.447 19.5 19.75 19.844 20.00 20.241 20.25 20.5 20.638 20.75 21.00 21.034 21.25 21.431
Inch .4173 .4213 .4219 .4252 .4291 .4331 .4370 .4375 .4409 .4449 .4488 .4528 .4531 .4567 .4606 .4646 .4685 .4688 .4724 .4764 .4803 .4843 .4844 .4882 .4921 .4961 .5000 .5039 .5079 .5118 .5156 .5157 .5197 .5236 .5276 .5312 .5315 .5354 .5394 .5433 .5469 .5472 .5512 .5610 .5625 .5709 .5781 .5807 .5906 .5938 .6004 .6094 .6102 .6201 .6250 .6299 .6398 .6406 .6496 .6562 .6594 .6693 .6719 .6791 .6875 .6890 .6988 .7031 .7087 .7185 .7188 .7283 .7344 .7382 .7480 .7500 .7579 .7656 .7677 .7776 .7812 .7874 .7969 .7972 .8071 .8125 .8169 .8268 .8281 .8366 .8438
Fraction
55/64 7/8
57/64
29/32 59/64
15/16 61/64
31/32
63/64 1
1 1/64 1 1/32
1 3/64 1 1/16
1 5/64
1 3/32 1 7/64
1 1/8 1 9/64
1 5/32
1 11/64 1 3/16
1 13/64 1 7/32
1 15/64 1 1/4 1 17/64 1 9/32 1 19/64 1 5/16 1 21/64 1 11/32 1 23/64 1 3/8 1 25/64 1 13/32 1 27/64 1 7/16 1 29/64
mm 21.5 21.75 21.828 22.00 22.225 22.25 22.5 22.622 22.75 23.00 23.019 23.25 23.416 23.5 23.75 23.812 24.00 24.209 24.25 24.5 24.606 24.75 25.00 25.003 25.25 25.400 25.5 25.75 25.797 26.0 26.194 26.25 26.5 26.591 26.75 26.988 27.0 27.25 27.384 27.5 27.75 27.781 28.0 28.178 28.25 28.5 28.575 28.75 28.972 29.0 29.25 29.369 29.5 29.75 29.766 30.0 30.162 30.25 30.5 30.559 30.75 30.956 31.0 31.25 31.353 31.5 31.75 32.0 32.147 32.5 32.544 32.941 33.0 33.338 33.5 33.734 34.0 34.131 34.5 34.528 34.925 35.0 35.322 35.5 35.719 36.0 36.116 36.5 36.512 36.909 37.0
Inch .8465 .8563 .8594 .8661 .8750 .8760 .8858 .8906 .8957 .9055 .9062 .9154 .9219 .9252 .9350 .9375 .9449 .9531 .9547 .9646 .9688 .9744 .9843 .9844 .9941 1.0000 1.0039 1.0138 1.0156 1.0236 1.0312 1.0335 1.0433 1.0469 1.0531 1.0625 1.0630 1.0728 1.0781 1.0827 1.0925 1.0938 1.1024 1.1094 1.1122 1.1220 1.1250 1.1319 1.1406 1.1417 1.1516 1.1562 1.1614 1.1713 1.1719 1.1811 1.1875 1.1909 1.2008 1.2031 1.2106 1.2188 1.2205 1.2303 1.2344 1.2402 1.2500 1.2598 1.2656 1.2795 1.2812 1.2969 1.2992 1.3125 1.3189 1.3281 1.3386 1.3438 1.3583 1.3594 1.3750 1.3780 1.3906 1.3976 1.4062 1.4173 1.4219 1.4370 1.4375 1.4531 1.4567
Fraction 1 15/32 1 31/64 1 1/2 1 33/64 1 17/32 1 35/64 1 9/16 1 37/64 1 19/32 1 39/64 1 5/8 1 41/64 1 21/32 1 43/64 1 11/16 1 45/64 1 23/32 1 47/64 1 3/4 1 49/64 1 25/32 1 51/64 1 13/16 1 53/64 1 27/32 1 55/64 1 7/8 1 57/64 1 29/32 1 59/64 1 15/16 1 61/64 1 31/32 1 63/64 2 2 1/32 2 1/16 2 3/32 2 1/8 2 5/32 2 3/16 2 7/32 2 1/4 2 9/32 2 5/16 2 11/32 2 3/8 2 13/32 2 7/16 2 15/32 2 1/2
mm 37.306 37.5 37.703 38.0 38.100 38.497 38.5 38.894 39.0 39.291 39.5 39.688 40.0 40.084 40.481 40.5 40.878 41.0 41.275 41.5 41.672 42.0 42.069 42.466 42.5 42.862 43.0 43.259 43.5 43.656 44.0 44.053 44.450 44.5 44.847 45.0 45.244 45.5 45.641 46.0 46.038 46.434 46.5 46.831 47.0 47.228 47.5 47.625 48.0 48.022 48.419 48.5 48.816 49.0 49.212 49.5 49.609 50.0 50.006 50.403 50.5 50.800 51.0 51.594 52.0 52.388 53.0 53.181 53.975 54.0 54.769 55.0 55.562 56.0 56.356 57.0 57.150 57.944 58.0 58.738 59.0 59.531 60.0 60.325 61.0 61.119 61.912 62.0 62.706 63.0 63.500
Inch 1.4688 1.4764 1.4844 1.4961 1.5000 1.5156 1.5157 1.5312 1.5354 1.5469 1.5551 1.5625 1.5748 1.5781 1.5938 1.5945 1.6094 1.6142 1.6250 1.6339 1.6406 1.6535 1.6562 1.6719 1.6732 1.6875 1.6929 1.7031 1.7126 1.7188 1.7323 1.7344 1.7500 1.7520 1.7656 1.7717 1.7812 1.7913 1.7969 1.8110 1.8125 1.8281 1.8307 1.8438 1.8504 1.8594 1.8701 1.8750 1.8898 1.8906 1.9062 1.9094 1.9219 1.9291 1.9375 1.9488 1.9531 1.9685 1.9688 1.9844 1.9882 2.0000 2.0079 2.0312 2.0472 2.0625 2.0866 2.0938 2.1250 2.1260 2.1562 2.1654 2.1875 2.2047 2.2188 2.2441 2.2500 2.2812 2.2835 2.3125 2.3228 2.3438 2.3622 2.3750 2.4016 2.4062 2.4375 2.4409 2.4688 2.4803 2.5000
Fraction 2 17/32 2 9/16 2 19/32 2 5/8 2 21/32 2 11/16 2 23/32 2 3/4 2 25/32 2 13/16 2 27/32 2 7/8 2 29/32 2 15/16 2 31/32 3 3 1/32 3 1/16 3 3/32 3 1/8 3 5/32 3 3/16 3 7/32 3 1/4 3 9/32 3 5/16 3 11/32 3 3/8 3 13/32 3 7/16 3 15/32 3 1/2
3 9/16
3 5/8 3 11/16
3 3/4 3 13/16
3 7/8
3 15/16 4 5 6
mm 64.0 64.294 65.0 65.088 65.881 66.0 66.675 67.0 67.469 68.0 68.262 69.0 69.056 69.850 70.0 70.644 71.0 71.438 72.0 72.231 73.0 73.025 73.819 74.0 74.612 75.0 75.406 76.0 76.200 76.994 77.0 77.788 78.0 78.581 79.0 79.375 80.0 80.169 80.962 81.0 81.756 82.0 82.550 83.0 83.344 84.0 84.138 84.931 85.0 85.725 86.0 86.519 87.0 87.312 88.0 88.106 88.900 89.0 90.0 90.488 91.0 92.0 92.075 93.0 93.662 94.0 95.0 95.250 96.0 96.838 97.0 98.0 98.425 99.0 100.0 100.012 101.600 127.000 152.400
Inch 2.5197 2.5312 2.5591 2.5625 2.5938 2.5984 2.6250 2.6378 2.6562 2.6772 2.6875 2.7165 2.7188 2.7500 2.7559 2.7812 2.7953 2.8125 2.8346 2.8438 2.8740 2.8750 2.9062 2.9134 2.9375 2.9528 2.9688 2.9921 3.0000 3.0312 3.0315 3.0625 3.0709 3.0938 3.1102 3.1250 3.1496 3.1562 3.1875 3.1890 3.2188 3.2283 3.2500 3.2677 3.2812 3.3071 3.3125 3.3438 3.3465 3.3750 3.3858 3.4062 3.4252 3.4375 3.4646 3.4688 3.5000 3.5039 3.5433 3.5625 3.5827 3.6220 3.6250 3.6614 3.6875 3.7008 3.7402 3.7500 3.7795 3.8125 3.8189 3.8583 3.8750 3.8976 3.9370 3.9375 4.0000 5.0000 6.0000
*Gauge and letter sizes are no longer recommended British Standard drill sizes. Every effort should be made to use the alternative Metric or Fractional sizes.
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