TECHNICAL SECTION
"NPT" TREAD SIZES

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 "NPT" THREAD SIZES:
Some of the most popular adapter fittings shown in our on-line shop are AN to NPT adapters 

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"NPT" SIZES

 While many variations are offered, column four in the chart shows which AN size corresponds to each NPT size when inside diameters (flow dimensions) are considered.

All Earl’s SWIVEL-SEALTM hose ends are designed to provide little or no restrictions when used with the corresponding AN fitting size.

We also offer a number of Metric and British Standard Pipe threads to AN fitting adapters.
 

Pipe Thread Size

Threads Per Inch

Theoretical I.D. of Ftg.

Closest AN Ftg. Size

1/16

27

1/16

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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

11-1/2

1

16

1-1/4

11-1/2

1-1/4

20

1-1/2

11-1/2

1-1/2

24

2

11-1/2

2

32

 

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