Thread Identification

North American Connections

 


National Pipe Tapered (NPT)

NPT-600

Sealing – The thread is tapered and the seal takes place by deformation of the threads.  Thread sealant tape is recommended for a leak free connection.  

 

Inch Size Dash Size Nominal Thread  Male Thread OD (inch) Female Thread ID (inch)
1/8 -02 1/8×27 13/32 (0.41) 3/8 (0.38)
1/4 -04 1/4×18 17/32 (0.54) 1/2 (0.49)
3/8 -06 3/8×18 11/16 (0.68) 5/8 (0.63)
1/2 -08 1/2×14 27/32 (0.84) 25/32 (0.77)
3/4 -12 3/4×14 1-1/16 (1.05) 1 (0.98)
1 -16 1×11-1/2 1-5/16 (1.32) 1-1/4 (1.24)
1-1/4 -20 1-1/4×11-1/2 1-21/32 (1.66) 1-19/32 (1.58)
1-1/2 -24 1-1/2×11-1/2 1-29/32 (1.90) 1-13/16 (1.82)
2 -32 2×11-1/2 2-3/8 (2.38) 2-5/16 (2.30)

 

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National Pipe Straight Mechanical (NPSM)

NPSM-600

Sealing – The 30° seat of the female seals against the 30° chamfer on the male.  The threads hold the connection mechanically.  A NPT male with a 30° chamfer will also seal with a NPSM female.

  

Inch Size Dash Size Nominal Thread Male Thread OD (inch) Female Thread ID (inch)
1/8 -02 1/8×27 13/32 (0.41) 3/8 (0.38)
1/4 -04 1/4×18 17/32 (0.54) 1/2 (0.49)
3/8 -06 3/8×18 11/16 (0.68) 5/8 (0.63)
1/2 -08 1/2×14 27/32 (0.84) 25/32 (0.77)
3/4 -12 3/4×14 1-1/16 (1.05) 1 (0.98)
1 -16 1×11-1/2 1-5/16 (1.32) 1-1/4 (1.24)
1-1/4 -20 1-1/4×11-1/2 1-21/32 (1.66) 1-19/32 (1.58)
1-1/2 -24 1-1/2×11-1/2 1-29/32 (1.90) 1-13/16 (1.82)
2 -32 2×11-1/2 2-3/8 (2.38) 2-5/16 (2.30)

 

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JIC 37° Flare    

SAE J514

JIC - 600

Sealing – The seal is created by establishing a line of contact between the male 37° nose and the female 37° flare.  The threads hold the connection mechanically.

  

Inch Size Dash Size Nominal Thread Male Thread OD (inch) Female Thread ID (inch)
1/8 -02 5/16x 24 5/16 (0.31) 9/32 (0.27)
3/16 -03 3/8×24 3/8 (0.38) 11/32 (0.34)
1/4 -04 7/16×20 7/16 (0.44) 13/32 (0.39)
5/16 -05 1/2×20 1/2 (0.50) 15/32 (0.45)
3/8 -06 9/16×18 9/16 (0.56) 17/32 (0.51)
1/2 -08 3/4×16 3/4 (0.75) 11/16 (0.69)
5/8 -10 7/8×14 7/8 (0.88) 13/16 (0.81)
3/4 -12 1-1/16×12 1-1/16 (1.06) 1 (0.98)
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 (2.50) 2-7/16 (2.42)

 

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SAE 45° Flare

SAE J512

SAE 45 - 600

 Sealing – Both the male and Female ends of this connection have 45° seats.  The seal takes place between the male 45° nose and the female 45° flare.  The threads hold the connection mechanically.

 

Inch Size Dash Size Nominal Thread Male Thread OD (inch) Female Thread ID (inch)
1/8 -02 5/16x 24 5/16 (0.31) 9/32 (0.27)
3/16 -03 3/8×24 3/8 (0.38) 11/32 (0.34)
1/4 -04 7/16×20 6/16 (0.44) 13/32 (0.39)
5/16 -05 1/2×20 1/2 (0.50) 15/32 (0.45)
3/8 -06 5/8x 18 5/8 (0.63) 9/16 (0.57)
1/2 -08 3/4×16 3/4 (0.75) 11/16 (0.69)
5/8 -10 7/8×14 7/8 (0.88) 13/16 (0.81)
3/4 -12 1-1/16×14 1-1/16 (1.06) 1 (0.99)
7/8 -14 1-1/4×12 1-1/4 (1.19) 1-5/32 (1.16)
1 -16 1-3/8×12 1-3/8 (1.31) 1-9/32 (1.29)

 

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SAE Straight Tread O-Ring (BOSS)

SAE J1926-1 and ISO 11296-1

Conforms to MS16142, UN/UNF Threads

BOSS-600

Sealing – The seal takes place by compressing the O-Ring into the chamfer.  The threads hold the connection mechanically.

  

Inch Size Dash Size Nominal Thread Male Thread OD (inch) Female Thread ID (inch)
1/8 -02 5/16x 24 5/16 (0.31) 9/32 (0.27)
3/16 -03 3/8×24 3/8 (0.38) 11/32 (0.34)
1/4 -04 7/16×20 7/16 (0.44) 13/32 (0.39)
5/16 -05 1/2×20 1/2 (0.50) 15/32 (0.45)
3/8 -06 9/16×18 9/16 (0.56) 17/32 (0.51)
1/2 -08 3/4×16 3/4 (0.75) 11/16 (0.69)
5/8 -10 7/8×14 7/8 (0.88) 13/16 (0.81)
3/4 -12 1-1/16×12 1-1/16 (1.06) 1 (0.98)
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 (2.50) 2-7/16 (2.42)

 

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Flareless Compression

SAE J514

flareless-600

Sealing – The seal is made between the sleeve and the 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 Male Thread OD (inch) Female Thread ID (inch)
1/8 -02 5/16x 24 5/16 (0.31) 9/32 (0.27)
3/16 -03 3/8×24 3/8 (0.38) 11/32 (0.34)
1/4 -04 7/16×20 7/16 (0.44) 13/32 (0.39)
5/16 -05 1/2×20 1/2 (0.50) 15/32 (0.45)
3/8 -06 9/16×18 9/16 (0.56) 17/32 (0.51)
1/2 -08 3/4×16 3/4 (0.75) 11/16 (0.69)
5/8 -10 7/8×14 7/8 (0.88) 13/16 (0.81)
3/4 -12 1-1/16×12 1-1/16 (1.06) 1 (0.98)
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 (2.50) 2-7/16 (2.42)

 

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Flat Face O-Ring (FFS)

SAE J1453

FF-600

Sealing – The seal takes place by compressing the O-Ring onto the flat face of the female.   The threads hold the connection mechanically.

 

Inch Size Dash Size Nominal Thread Male Thread OD (inch) Female Thread ID (inch)
1/4 -04 9/16×18 9/16 (0.56) 17/32 (0.51)
3/8 -06 11/16×16 11/16 (0.69) 5/8 (0.63)
1/2 -08 13/16×16 13/16 (0.82) 3/4 (0.75)
5/8 -10 1×14 1 (1.00) 15/16 (0.93)
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) 1-3/4 (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)

 

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Inverted Flare

SAE J512

invert-600

Sealing – The seal takes place on the flared surfaces.  The threads hold the connection mechanically.

  

Inch Size Dash Size Nominal Thread Male Thread OD (inch) Female Thread ID (inch)
1/8 -02 5/16x 28 5/16 (0.32) 9/32 (0.28)
3/16 -03 3/8×24 3/8 (0.38) 11/32 (0.34)
1/4 -04 7/16×24 7/16 (0.44) 13/32 (0.40)
5/16 -05 1/2×20 1/2 (0.50) 15/32 (0.45)
3/8 -06 5/8×18 5/8 (0.63) 9/16 (0.57)
7/16 -07 11/16×18 11/16 (0.69) 5/8 (0.63)
1/2 -08 3/4×18 3/4 (0.75) 23/32 (0.70)
5/8 -10 7/8×18 7/8 (0.88) 13/16 (0.82)
3/4 -12 1-1/16×16 1-1/16 (1.06) 1 (1.00)

 

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Four Bolt Flange

SAE J518 and ISO 6162

Interchangeable with DIN 20066 and JIS B 8363, except for the bolt sizes.  All Caterpillar® Flange dimensions are identical to Code 62 dimensions on this chart.  The difference is the flange thickness.  All CAT flange sizes have a flange thickness of 0.56″.

Four-Bolt-Flange-600

Sealing – An O-Ring, inserted into a ring groove in the flange head, seals on a smooth faced female port.  It is held in place by two clamp halves and four bolts in a rectangular pattern.

  

Port Size (inch) Dash Size Code 61 Bolt Spacing       (inch) Code 61 Flange Head Diameter (inch) Code 62 Bolt Spacing       (inch) Code 62 Flange Head Diameter (inch)
1/2 -08 1-1/2 (1.50) 1-3/16 (1.19) 1-19/32 (1.59) 1-1/4 (1.25)
3/4 -12 1-7/8 (1.88) 1-1/2 (1.50) 2 (2.00) 1-5/8 (1.63)
1 -16 2-1/16 (2.06) 1-3/4 (1.75) 2-1/4 (2.25) 1-7/8 (1.88)
1-1/4 -20 2-5/16 (2.31) 2 (2.00) 2-5/8 (2.63) 2-1/8 (2.13)
1-1/2 -24 2-3/4 (2.75) 2-3/8 (2.38) 3-1/8 (3.13) 2-1/2 (2.50)
2 -32 3-1/16 (3.06) 2-13/32 (2.81) 3-13/16 (3.81) 3-1/8 (3.13)
2-1/2 -40 3-1/2 (3.50) 3-5/16 (3.31)    
3 -48 4-3/16 (4.19) 4 (4.00)    
3-1/2 -56 4-3/5 (4.75) 4-1/2 (4.53)    
4 -64 5-1/8 (5.12) 5 (5.03)    
 
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