NPT thread SAE J514

Questions & Answers - Hydraulics General

NPTF threadThe NPT thread SAE J514 is the most widely used in now days.

 

This does not mean that is the best choice when we are trying to stop leaks in our hydraulic system.

NPT thread is tapered. It means that the seal is made by the deformation of threads. The NPTF male will mate with NPTF or NPSM female connectors.

The NPSM female has straight threads and a 30o cone seat. When used with a NPTF tapered pipe thread with a 30o chamfered seat the seal takes place by compression of the 30o on the chamfer.

 

NPTF male and female, NPSM female

 

SIZE

THREAD

MALE

THREAD OD

inches

FEMALE THREAD

NPTF ID

inches

FEMALE THREAD NPSM ID

inches

-1

1/16 - 27

5/16

5/16

5/16

-2

1/8 - 27

13/32

3/8

3/8

-4

1/4 - 18

17/32

1/2

1/2

-6

3/8 - 18

11/16

5/8

5/8

-8

1/2 - 14

27/32

25/32

25/32

-12

3/4 - 14

1 1/16

1

1

-16

1 - 11 1/2

1 5/16

1 1/4

1 1/4

-20

1 1/4 - 11 1/2

1 21/32

1 19/32

1 19/32

-24

1 1/2 - 11 1/2

1 29/32

1 13/16

1 13/16

-32

2 - 11 1/2

2 3/8

2 5/16

2 5/16


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