PTC-B1.20.1 Overview
Copyrighted material licensed to Fermi National Laboratory by Thomson Scientific, Inc. 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.