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ASME B1.20.1-2013
Pipe Threads, General Purpose (Inch)
1 INTRODUCTION
1.1 Scope
This Standard covers dimensions and gaging of pipe threads of the following series:
NPT NPSC NPTR NPSM NPSL
1.2 Related Standard
Hose coupling joints are ordinarily made with straight internal and external loose-fitting threads. There are several standards of hose threads having various diameters and pitches, one of which is based on the American National Standard Pipe Thread.