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BSPT British Standard Pipe Tapered thread size chart

Date:Apr 02, 2020

British Standard Pipe Tapered (BSPT)

The tapered male connects with a tapered female, with the seal forming in the threads.

Note: Although the BSPT male end is comparable to the National Pipe Tapered Fuel (NPTF), they are not interchangeable, due to their different size and thread form.

 

 

 

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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