British Standard Pipe – BSPP (BSPP Parallel & BSPT Tapered)

DASH SIZE

INCH SIZE

THREAD

MALE
THREAD
O.D.
(mm)

MALE
THREAD
O.D.
(inches)

FEMALE
THREAD
I.D.
(mm)

FEMALE
THREAD
I.D.
(inches)

2

1/8

1/8-28

10.3

.41

9.4

.37

4

1/4

1/4-19

13.7

.54

12.4

.49

6

3/8

3/8-19

17.3

.68

15.7

.62

8

1/2

1/2-14

21.3

.84

19.3

.76

10

5/8

5/8-14

22.9

.90

21.1

.83

12

3/4

3/4-14

26.9

1.06

24.9

.98

16

1

1-11

33.3

1.31

31.5

1.24

20

1 1/4

1 1/4-11

42.2

1.66

40.1

1.58

24

1 1/2

1 1/2-11

48.3

1.90

46.2

1.82

32

2

2-11

60.4

2.38

57.9

2.29