PVC and CPVC Threaded Pipe

American National Standards Institute Code B1.20.1 covers dimensions and tolerances for tapered pipe threads. Only Schedule 80 or heavier wall pipe should be threaded.

Angle between sides of thread is 60 degrees. Taper of thread, on diameter, is 3/4 inch per foot. The basic thread depth is 0.8 x pitch of thread and the crest and root are truncated an amount equal to 0.033 x pitch, excepting 8 threads per inch which have a basic depth of 0.788 x pitch and are truncated 0.045 x pitch at the crest and 0.033 x pitch at the root.

PVC and CPVC Threaded Pipe

PIPE THREADS
Nominal Size (in.) Outside Diameter (in.) D Number of Threads Per Inch Normal Engagement By Hand (in.) C Length of Effective Thread (in.) A Total Length: End of pipe to vanish point (in.) B Pitch Diameter at end of Internal Thread (in.) E Depth of Thread (Max.)(in.)
1/8 0.405 27 0.18 0.2639 0.3924 0.37476 0.02963
1/4 0.54 18 0.228 0.4018 0.5946 0.49163 0.04444
3/8 0.675 18 0.24 0.4078 0.6006 0.62701 0.04444
1/2 0.84 14 0.32 0.5337 0.7815 0.77843 0.05714
3/4 1.05 14 0.339 0.5457 0.7935 0.98887 0.05714
1 1.315 11 1/2 0.4 0.6828 0.9845 1.23863 0.06957
1 1/4 1.66 11 1/2 0.42 0.7068 1.0085 1.58338 0.06957
1 1/2 1.9 11 1/2 0.42 0.7235 1.0252 1.82234 0.06957
2 2.375 11 1/2 0.436 0.7565 1.0582 2.29627 0.06957
2 1/2 2.875 8 0.682 1.1375 1.5712 2.76216 0.1
3 3.5 8 0.766 1.2 1.6337 3.3885 0.1
4 4.5 8 0.844 1.3 1.7337 4.38713 0.1
5 5.563 8 0.937 1.4063 1.84 5.44929 0.1
6 6.625 8 0.958 1.5125 1.9462 6.50597 0.1

** The Pressure ratings shown are for water, non-shock, @ 73°F with plain end pipe. Threaded pipe requires a 50% reduction in the pressure ratings stated. Appropriate temperature de-rating factors must be applied to determine the maximum allowable pressure when working at elevated temperatures greater than 73°F.