NPSM (National Pipe Straight Mechanical) – ANSI/ASME B1.20.1-1983. The NPSM female pipe swivel seats on a 30° seat (chamfer) and is visible down inside of the swivel nut. This swivel nut is permanently attached to the body and mates with a male pipe thread that has a 30° seat (chamfer) machined into the end of it. The threads bring both 30° seats (flare and chamfer) together creating a metal-to-metal seal. The 30° seat is a chamfer machined into the inside diameter of a male pipe thread and should not be confused with a relatively small deburr chamfer.
NPSM swivel adapters add versatility to male NPT hose and adapter connections. Both NPT and NPSM connectors have the same number of threads per inch, and the angle of each thread is 60 degrees. The obvious difference between NPT and NPSM, as their names indicate, is that the former is tapered (slightly conical) while the latter is straight (parallel).
QC Hydraulics offers a wide range of NPSM swivel fittings from 1/8” to 2” manufactured in stainless steel as a standard material in accordance with SAE J514. Welcome to your inquiries and please feel free to contact us if you want to learn more about our products.