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NPSM thread Fitting size chart

Date:Apr 02, 2020

National Pipe Straight Mechanical (NPSM)

Both male and female NSPM connectors' threads are straight, The female fitting has an inverted 30°seat, A mechanical connection is made when the both male and female are mated together. The tapered seat creates a leak-resistant connection, and are commonly found in fluid power systems. A properly chamfered NPTF male will also seal with the NPSM female.

 

Note: A NPSM female can seal together with a chamfered NPTF male.

Inch size

Dash size

Threads per Inch

Male Thread O.D. (in)

Female thread O.D (in)

1⁄8

-2

27

13⁄32

0.41

3⁄8

0.38

1⁄4

-4

18

17⁄32

0.54

1⁄2

0.49

3⁄8

-6

14

11⁄16

0.68

5⁄8

0.63

1⁄2

-8

14

27⁄32

0.84

25⁄32

0.77

3⁄4

-12

14

1 1⁄16

1.05

1

0.98

1

-16

11 1⁄2

1 5⁄16

1.32

1 1⁄4

1.24

1 1⁄4

-20

11 1⁄2

1 21⁄32

1.66

1 19⁄32

1.58

1 1⁄2

-24

11 1⁄2

1 29⁄32

1.90

1 13⁄16

1.82

2

-32

11 1⁄2

2 3⁄8

2.38

2 5⁄16

2.30


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