Shell
size
（ps.1）

Coupling Threads A

Cable
end
B ±0.3

Length of
connector
J ±0.3

Full of
length
L

Outer
radius
Q ±0.8

Rear Threads
V

Length
of thread
over W

14s

7/8-20UNF-2B

11

11.5

44

28.2

3/4-20UNF-2A

16S

1-20UNEF-2B

14.3

13.5

42.8

31.8

7/8-20UNEF-2A

9.5

16

1-20UNEF-2B

14.3

18.3

52.4

31.8

7/8-20UNEF-2A

9.5

18

1-1/8-18UNEF-2B

15.9

18.3

52.4

34.1

1-20UNEF-2A

9.5

20

1-1/4-18UNEF-2B

17

18.6

57.9

37

1-3/16-18UNEF-2A

10.2

22

1-3/8-18UNEF-2B

17

18.6

57.5

40.2

1-3/16-18UNEF-2A

10.2

24

1-1/2-18UNEF-2B

23.8

18.3

58.7

43.7

1-7/16-18UNEF-2A

9.5

28

1-3/4-18UNEF-2B

23.8

18.3

58.7

50.0

1-7/16-18UNEF-2A

9.5