AN Threads

Use the profiles below to determine the correct AN thread before ordering. The corresponding chart displays the outer diameter of the metal tube and thread size.

AN Size

Metal Tube O.D.

Thread Size

3

3/16"

3/8-24 UNJF

4

1/4"

7/16-20 UNJF

6

3/8"

9/16-18 UNJF

8

1/2"

3/4-16 UNJF

10

5/8"

7/8-14 UNJF

12

3/4"

1 1/16-12 UNJF

16

1"

1 5/16-12 UNJF

20

1 1/4"

1 5/8-12 UNJF
 

NPT Threads

Use the profiles below to determine the correct NPT thread before ordering. The corresponding chart displays the pipe thread size, the number of threads per inch, the inner diameter of the fitting, and the closest AN thread.

Pipe Thread Size

Threads Per Inch

Fitting I.D.

Closest AN fitting size

1/8"

27

1/8"

4

1/4"

18

1/4"

6

3/8"

18

3/8"

8

1/2"

14

1/2"

10

3/4"

14

3/4"

12

1"

11.5

1"

16

1 1/4"

11.5

1 1/4"

20

Torque Specifications

Fitting Size

Max. Torque in Foot Pounds

Many people over tighten the aluminum fitting on the adapter, which distorts the 37 degree seat, and may cause leakage. Both the threads and the seat surface should have a drop or two of oil to smooth the tightening process. The maximum torque specifications are listed here. (An alternate method of tightening is to bring the nut to "hand-tight" and then rotate it another turn with the proper wrench.)

3

8.75

4

11.5

6

16.25

8

29

10

35

12

45

16

70

20

85

Size Chart 

A-N Thread

Pipe Thread

B-Nut Hex

A-N Size

Tube Diameter

Thread Size (SAE)

Pipe Thread

Threads per Inch

A-N Size

Hex Diameter

-2

1/8"

5/16-24

1/16"

27

    

-3

3/16"

3/8-24

1/8"

27

#3

1/2"

-4

1/4"

7/16-20

1/4"

18

#4

9/16"

-6

3/8"

9/16-18

3/8"

18

#6

11/16"

-8

1/2"

3/4-16

1/2"

14

#8

7/8"

-10

5/8"

7/8-14

3/4

14

#10

1"

-12

3/4"

1 1/16-12

1"

11

#12

1 1/4"

-16

1"

1 5/16-12

    

#16

1 1/2"

-20

1 1/4"

1 5/8-12

    

#20

1 7/8"

-24

1 1/2"

1 7/8-12

        

-28

1 3/4"

2 1/4-12

        

-32

2"

2 1/2-12

        

 

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