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.