Tube O.D

UN thread

Part Number

A

W

inch

mm

1/16

10-32UNF

1NU1

0.31

7.9

5/16

1/8

5/16-20UN

2NU2

0.47

11.9

7/16

3/16

3/8-20UN

3NU3

0.47

11.9

1/2

1/4

7/16-20UNF

4NU4

0.50

12.7

9/16

5/16

1/2-20UNF

5NU5

0.53

13.5

5/8

3/8

9/16-20UN

6NU6

0.56

14.4

11/16

1/2

3/4-20UNEF

8NU8

0.69

17.5

7/8

5/8

7/8-20UNEF

10NU10

0.69

17.5

1

3/4

1-20UNEF

12NU12

0.69

17.5

1.1/8

7/8

1.1/8-20UN

14NU14

0.69

17.5

1.1/4

1

1.5/16-20UN

16NU16

0.81

20.6

1.1/2

Metric tubing

Tube O.D

UN thread

Part Number

A

W

mm

3

5/16-20UN

3MNU

11.9

12

4

3/8-20UN

4MNU

11.9

12

6

7/8-20UNF

6MNU

12.7

14

8

1/2-20UNF

8MNU

13.5

16

10

5/8-20UN

10MNU

15.1

19

12

3/4-20UNEF

12MNU

17.5

22

16

7/8-20UNEF

16MNU

17.5

25

18

1-20UNEF

18MNU

17.5

30

20

1.1/8-20UN

20MNU

17.5

32

25

1.5/16-20UN

25MNU

20.6

38