AN & NPT Thread Sizes Chart

 

AN & NPT Thread Sizes

AN Thread Sizes

NPT Thread Sizes

AN Size

Tube Size

Thread

Pipe Size

Threads/Inch

- 2

1/8"

5/16 - 24

1/16

27

- 3

3/16"

3/8 - 24

1/8

27

- 4

1/4"

7/16 - 20

1/4

18

- 5

5/16"

1/2 - 20

3/8

18

- 6

3/8"

9/16 - 18

1/2

14

- 8

1/2"

3/4 - 16

3/4

14

- 10

5/8"

7/8 - 14

1

11 1/2

- 12

3/4"

1 1/16 - 12

1 1/4

11 1/2

- 16

1"

1 5/16 - 12

1 1/2

11 1/2

- 20

1 1/4"

1 5/8 - 12

2

11 1/2

- 24

1 1/2"

1 7/8 - 12

 

 

- 28

1 3/4"

2 1/4 - 12

 

 

- 32

2"

2 1/2 – 12

 

 

Tube size is indicated in 1/16"
Examples:
1AN = 1/16"
4AN = 4/16" = 1/4"
6AN = 6/16" = 3/8"

 

 
File attachments : 
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PDF icon an_npt_thread_sizes.pdf61.04 KB
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