American conical pipe thread ACC. ANSI/ASME B 1.20.1 – 1983 inside thread conical, outside thread conical

American conical pipe thread ACC. ANSI/ASME B 1.20.1 - 1983 inside thread conical, outside thread conical

Thread American conical pipe thread acc. ANSI/ASME B 1.20.1 – 1983
Abbreviation NPT
Designation 3/8 – 18 NPT
Type of thread inside thread conical outside thread conical (cone 1:16)
Application Pipe threads for pipes and tube connections with sealing tapes (see pages 8 – 10) are sealing inside the threads
Description The conical NPT-outside thread shows at the relating level &147;. The adjustment power created by using of a suitable tool increases the thread reach and seals the screw connection supported by a suitable sealant (e.g. hemp or Teflon). Since both inside and outside threads are conical, more thread-turns contribute to better sealing and power admission. The little thread-flattening causes a small leakage space.

 

thread
outside Ø of pipe
number of threads
P
h
effective Ø E1
L1
i
1/8" NPT10.287270.9410.7539.4894.1026.703
1/4" NPT13.761181.4111.12912.4875.78610.206
3/8" NPT17.145181.4111.12915.9266.09610.358
1/2" NPT21.336141.8141.45119.7728.12813.556
3/4" NPT26.67141.8141.45125.1178.61113.861
1" NPT33.40111.52.2091.76731.46110.1617.343
1 1/4" NPT42.16411.52.2091.76740.21810.66817.953
1 1/2" NPT48.2611.52.2091.76746.28710.66818.377