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National Pipe Straight Mechanical Fittings (NPSM)


The NPSM (NATIONAL PIPE STRAIGHT MECHANICAL) Female Pipe Swivel was designed to eliminate hose stress from twisting during assembly and reduce the number of different hose fittings required. 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.

It should be noted that not all NPT and NPTF male pipe threads have this 30° chamfer. It is optional according to SAE standards under J514. 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-tech


NPSM Thread Dimensions
Size
(inches)
Threads
Per
Inch
Outside
Diameter of
the Male
(max)
Inside
Diameter of
the Female
(min)
02 (1/8) 27 0.397 0.358
04 (1/4) 18 0.526 0.468
06 (3/8) 18 0.662 0.603
08 (1/2) 14 0.823 0.747
12 (3/4) 14 1.034 0.958
16 (1) 11.5 1.293 1.201
20 (1¼) 11.5 1.638 1.546
24 (1½) 11.5 1.877 1.785
32 (2) 11.5 2.351 2.259
40 (2½) 8 2.841 2.708
48 (3) 8 3.467 3.334
64 (4) 8 4.466 4.333
80 (5) 8 5.528 5.395
96 (6) 8 6.585 6.452
Thread Size = Male Thread OD - Threads per Inch
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