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Port and Fitting Size Chart

National Pipe Tapered Fuel (NPTF)

This connection is still widely used, even though it is not recommended by the National Fluid Power Association (NFPA) for use in hydraulic applications. The thread is tapered and the seal takes place by deformation of the threads. Measure thread diameter and subtract one quarter-inch to find the nominal pipe size.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/8
-02
1/8-27
13/32" (.41)
3/8" (.38)
1/4
-04
1/4-18
17/32" (.54)
1/2" (.49)
3/8
-06
3/8-18
11/16" (.68)
5/8" (.63)
1/2
-08
1/2-14
27/32" (.84)
25/32" (.77)
3/4
-12
3/4-14
1 1/16" (1.05)
1" (.98)
1
-16
1-11.5
1 5/16" (1.32)
1 1/4" (1.24)
1 1/4
-20
1 1/4-11.5
1 21/32" (1.66)
1 19/32" (1.58)
1 1/2
-24
1 1/2-11.5
1 29/32" (1.90)
1 13/16" (1.82)
2
-32
2-11.5
2 3/8" (2.38)
2 5/16" (2.30)

 

National Pipe Straight Mechanical (NPSM)

The female fitting has a straight thread and an inverted 30° seat. The male fitting has a straight thread and a 30° internal chamfer. The seal takes place by compression of the seat on the chamfer. The threads hold the connection mechanically. A properly chamfered NPTF male will also seal with the NPSM female.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/8
-02
1/8-27
13/32" (.41)
3/8" (.38)
1/4
-04
1/4-18
17/32" (.54)
1/2" (.49)
3/8
-06
3/8-18
11/16" (.68)
5/8" (.63)
1/2
-08
1/2-14
27/32" (.84)
25/32" (.77)
3/4
-12
3/4-14
1 1/16" (1.05)
1" (.98)
1
-16
1-11.5
1 5/16" (1.32)
1 1/4" (1.24)
1 1/4
-20
1 1/4-11.5
1 21/32" (1.66)
1 19/32" (1.58)
1 1/2
-24
1 1/2-11.5
1 29/32" (1.90)
1 13/16" (1.82)
2
-32
2-11.5
2 3/8" (2.38)
2 5/16" (2.30)

 

SAE J514 37° Flare (also known as JIC)

This is a very common connection in fluid power applications. Both the male and female fittings have 37° seat. The seal takes place between the male flare and female cone seat. The threads hold the connection mechanically.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/8 -02 5/16-24 5/16" (.31) 9/32" (.27)
3/16 -03 3/8-24 3/8" (.38) 11/32" (.34)
1/4 -04 7/16-20 7/16" (.44) 13/32" (.39)
5/16 -05 1/2-20 1/2" (.50) 15/32" (.45)
3/8 -06 9/16-18 9/16" (.56) 17/32" (.51)
1/2 -08 3/4-16 3/4" (.75) 11/16" (.69)
5/8 -10 7/8-14 7/8" (.88) 13/16" (.81)
3/4 -12 1 1/16-12 1 1/16" (1.06) 1" (.98)
7/8 -14 1 3/16-12 1 3/16" (1.19) 1 1/8" (1.10)
1 -16 1 5/16-12 1 5/16" (1.31) 1 1/4" (1.23)
1 1/4 -20 1 5/8-12 1 5/8" (1.63) 1 9/16 (1.54)
1 1/2 -24 1 7/8-12 1 7/8" (1.88) 1 13/16" (1.79)
2 -32 2 1/2-12 2 1/2-12" (2.50) 2 7/16" (2.42)

 

SAE J512 45° Flare

This is a very common connection in refrigeration, automotive and truck piping systems. The fittings are frequently made of brass. Both the male and female fittings have 45° seat. The seal takes place between the male flare and female cone seat. The threads hold the connection mechanically.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/8 -02 5/16-24 5/16" (.31) 9/32" (.27)
3/16 -03 3/8-24 3/8" (.38) 11/32" (.34)
1/4 -04 7/16-20 7/16" (.44) 13/32" (.39)
5/16 -05 1/2-20 1/2" (.50) 15/32" (.45)
3/8 -06 5/8-18 5/8" (.63) 9/16" (.57)
1/2 -08 3/4-16 3/4" (.75) 11/16" (.69)
5/8 -10 7/8-14 7/8" (.88) 13/16" (.81)
3/4 -12 1 1/16-14 1 1/16" (1.06) 1" (.99)
7/8 -14 1 3/16-12 1 3/16" (1.19) 1 1/8" (1.10)
1 -16 1 5/16-12 1 5/16" (1.31) 1 1/4" (1.23)

 

SAE J514 Straight Thread O-Ring Boss (ORB)

Recommended by the NFPA for optimal leakage control in medium and high pressure hydraulic systems. The male fitting has a straight thread and O-ring. The female port has a straight thread, a machined surface (minimum spot face) and a chamfer to accept the O-ring. The seal take place by compressing the O-ring in the chamfer. The threads hold the connection mechanically.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/8 -02 5/16-24 5/16" (.31) 9/32" (.27)
3/16 -03 3/8-24 3/8" (.38) 11/32" (.34)
1/4 -04 7/16-20 7/16" (.44) 13/32" (.39)
5/16 -05 1/2-20 1/2" (.50) 15/32" (.45)
3/8 -06 9/16-18 9/16" (.56) 17/32" (.51)
1/2 -08 3/4-16 3/4" (.75) 11/16" (.69)
5/8 -10 7/8-14 7/8" (.88) 13/16" (.81)
3/4 -12 1 1/16-12 1 1/16" (1.06) 1" (.98)
7/8 -14 1 3/16-12 1 3/16" (1.19) 1 1/8" (1.10)
1 -16 1 5/16-12 1 5/16" (1.31) 1 1/4" (1.23)
1 1/4 -20 1 5/8-12 1 5/8" (1.63) 1 9/16 (1.54)
1 1/2 -24 1 7/8-12 1 7/8" (1.88) 1 13/16" (1.79)
2 -32 2 1/2-12 2 1/2-12" (2.50) 2 7/16" (2.42)

 

SAE J514 Flareless Compression Tube Fittings

The male fitting has straight threads and a 24° seat. The female connection uses a tube, tube nut, and bite-type sleeve. When the tube nut is tightened the seal is made between the sleeve and 24° seat. A seal is also made between the sleeve and the tubing. The threads hold the connection mechanically.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/8
-02
5/16-24
5/16" (.31)
9/32" (.27)
3/16
-03
3/8-24
3/8" (.38)
11/32" (.34)
1/4
-04
7/16-20
7/16" (.44)
13/32" (.39)
5/16
-05
1/2-20
1/2" (.50)
15/32" (.45)
3/8
-06
9/16-18
9/16" (.56)
17/32" (.51)
1/2
-08
3/4-16
3/4" (.75)
11/16" (.69)
5/8
-10
7/8-14
7/8" (.88)
13/16" (.81)
3/4
-12
1 1/16-12
1 1/16" (1.06)
1" (.98)
7/8
-14
1 3/16-12
1 3/16" (1.19)
1 1/8" (1.10)
1
-16
1 5/16-12
1 5/16" (1.31)
1 1/4" (1.23)
1 1/4
-20
1 5/8-12
1 5/8" (1.63)
1 9/16 (1.54)
1 1/2
-24
1 7/8-12
1 7/8" (1.88)
1 13/16" (1.79)
2
-32
2 1/2-12
2 1/2-12" (2.50)
2 7/16" (2.42)

 

SAE J5143 O-Ring Face Seal (ORFS)

The best leak protection available today. The male fitting has a straight thread and O-ring in the face. The female has a straight thread and a machined flat face. The seal takes places by compressing the O-ring onto the flat face of the female, similar to a split flange fitting. The threads hold the connection mechanically.

Inch Size
Dash Size
Nominal Thread Size
Male Thread OD
Female Thread ID
1/4 -04 9/16-18 9/16" (.56) 17/13" (.51)
3/8 -06 11/16-16 11/16" (.69) 5/8" (.63)
1/2 -08 13/16-16 13/16" (.82) 3/4" (.75)
5/8 -10 1-14 1" (1.00) 15/16" (.93)
3/4 -12 1 3/16-12 1 3/16" (1.19) 1 1/8" (1.11)
1 -16 1 7/16-12 1 7/16" (1.44) 1 3/8" (1.36)
1 1/4 -20 1 11/16-12 1 11/16" (1.69) 1 5/8" (1.61)
1 1/2 -24 2-12 2" (2.00) 1 15/16" (1.92)

 

SAE J518 Four-Bolt Flange

This connection is available in two pressure ratings. Code 61 is intended for for pressures up to 3,000 psi. Code 62 is intended for up to 6,000 psi. Bolt hole spacing and flange head diameters are larger for the higher pressure Code 62 fittings.

The female port is an unthreaded hole with four bolt holes in a rectangular pattern around the port. The male fitting is a flanged head, grooved for an O-ring, and either a captive flange or split flange halves with bolt holes to match the port. The seal takes place by compressing the O-ring between the flanged head and the flat surface surrounding the port. The threaded bolts hold the connection together.

Inch Size
Dash Size
Bolt Hole Spacing Flange Head Diameter
Code 61
Code 62
Code 61
Code 62
1/2 -08 1 1/2" (1.50) 1 19/32" (1.59) 1 3/16" (1.19) 1 1/4' (1.25)
3/4 -12 1 7/8" (1.88) 2" (2.00) 1 1/2" (1.50) 1 5/8" (1.63)
1 -16 2 1/16" (2.06) 2 1/4" (2.25) 1 3/4" (1.75) 1 7/8" (1.88)
1 1/4 -20

2 5/16" (2.31)

2 5/8" (2.63) 2" (2.00) 2 1/8" (2.13
1 1/2 -24 2 3/4" (2.75) 3 1/8" (3.13) 2 3/8" (2.38) 2 1/2" (2.50)
2 -32 3 1/16" (3.06) 3 13/16" (3.81) 3 1/16" 3 1/8" (3.13)

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