PIPE SIZES RIGID Nominal Size
Outer Diameter (inches)
Use with Pipe Clamp
1/2
0.840
4322
3/4
1.050
4323
1
1.315
4324
1-1/4
1.660
4325
1-1/2
1.900
4326
2
2.375
4327
2-1/2
2.875
4328
3
3.500
4329
3-1/2
4.000
4330
4
4.500
4331
5
5.563
4332
6
6.625
4333
8
8.625
4335
10
10.750
4336
12
12.750
4337
14
14.000
440901
Rigid metal conduit (RMC) is a thick-walled threaded tubing, usually made of coated steel, stainless steel or aluminum. Rigid conduit, schedule 40 & 80 steel pipe and schedule 40 & 80 PVC pipe all have the same outer diameter, Beginning with a pipe size of 14�, the nominal size is the same as the actual outer diameter. Universal clamps are designed to fit both Rigid & EMT conduit.
With size 14� and above you would specify an O.D. clamp.
PIPE SIZES EMT Nominal Size
Outer Diameter (inches)
Use with Pipe Clamp
1/2
0.706
4311
3/4
0.922
4312
1
1.163
4313
1-1/4
1.510
4314
1-1/2
1.740
4315
2
2.197
4316
2-1/2
2.875
4328
With size 2-1/2� and above you would specify a Rigid clamp.
Electrical metallic tubing (EMT), sometimes called thin-wall, is commonly used instead of galvanized rigid conduit as it is less costly and lighter. EMT is generally made of coated steel, though it may be aluminum. EMT sized 2-1/2� and above have the same outside diameter as Rigid conduit of the same nominal size Universal clamps are designed to fit both Rigid & EMT conduit.
PIPE SIZES COPPER TUBE TYPE M, L, & K
Nominal Size
Outer Diameter (inches)
Use with Pipe Clamp
1/4”
0.375
4481
3/8”
0.500
4482
1/2
0.625
4483
3/4
0.875
4484
1
1.125
4485
1-1/4
1.375
4486
1-1/2
1.625
4487
2
2.125
4488
2-1/2
2.625
4489
3
3.125
4490
3-1/2
3.625
4491
4
4.125
4492
5
5.125
4493
6
6.125
4494
8
8.125
4495
The size of copper tubing is designated by its nominal diameter, which is 1/8” less than the outside diameter. Steel pipe clamps are coated with copper plating, or a copper colored epoxy to prevent galvanic corrosion caused by prolonged contact between dissimilar metals Galvanic corrosion is an electrochemical process in which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte