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BSPP British Standard Pipe Parallel thread size chart

Date:Apr 02, 2020

British Standard Pipe Parallel (BSPP)

The male end has a 300 seat, which tapered nose of the female swivel makes the seal with.

Note: Although the male end is comparable to the American National Pipe Straight Mechanical (NPSM) male, they not interchangeable, due to their different thread pitches.

Inch size

Dash size

Thread Size

Male Thread O.D. (in)

Female thread O.D (in)

1⁄8

-2

1⁄8 - 28

3⁄8

0.38

11⁄32

0.35

1⁄4

-4

1⁄4 - 19

33⁄64

0.52

15⁄32

0.47

3⁄8

-6

3⁄8 - 19

21⁄32

0.65

19⁄32

0.60

1⁄2

-8

1⁄2 - 14

13⁄16

0.82

3⁄4

0.75

5⁄8

-10

5⁄8 - 14

7⁄8

0.88

13⁄16

0.80

3⁄4

-12

3⁄4 - 14

1 1⁄32

1.04

31⁄32

0.97

1

-16

1 - 11

1 5⁄16

1.30

1 7⁄32

1.22

1 1⁄4

-20

1 1⁄4 - 11

1 21⁄32

1.65

1 9⁄16

1.56

1 1⁄2

-24

1 1⁄2 - 11

1 7⁄8

1.88

1 25⁄32

1.79

2

-32

2 - 11

2 11⁄32

2.35

2 1⁄4

2.26


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