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Fitting Size Charts

American Connections

National Pipe Tapered Fuel (NPTF)

Inch size Dash size Threads per Inch Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 27 13⁄32 0.41 3⁄8 0.38
1⁄4 -4 18 17⁄32 0.54 1⁄2 0.49
3⁄8 -6 18 11⁄16 0.68 5⁄8 0.63
1⁄2 -8 14 27⁄32 0.84 25⁄32 0.77
3⁄4 -12 14 1 1⁄16 1.05 1 0.98
1 -16 11 1⁄2 1 5⁄16 1.32 1 1⁄4 1.24
1 1⁄4 -20 11 1⁄2 1 21⁄32 1.66 1 19⁄32 1.58
1 1⁄2 -24 11 1⁄2 1 29⁄32 1.90 1 13⁄16 1.82
2 -32 11 1⁄2 2 3⁄8 2.38 2 5⁄16 2.30

National Pipe straight mechanical (NPSM)

Inch size Dash size Threads per Inch Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 27 13⁄32 0.41 3⁄8 0.38
1⁄4 -4 18 17⁄32 0.54 1⁄2 0.49
3⁄8 -6 14 11⁄16 0.68 5⁄8 0.63
1⁄2 -8 14 27⁄32 0.84 25⁄32 0.77
3⁄4 -12 14 1 1⁄16 1.05 1 0.98
1 -16 11 1⁄2 1 5⁄16 1.32 1 1⁄4 1.24
1 1⁄4 -20 11 1⁄2 1 21⁄32 1.66 1 19⁄32 1.58
1 1⁄2 -24 11 1⁄2 1 29⁄32 1.90 1 13⁄16 1.82
2 -32 11 1⁄2 2 3⁄8 2.38 2 5⁄16 2.30

JIC 37° Flare (SAE J514)

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 5⁄16 – 24 5⁄16 0.31 9⁄32 0.27
3⁄16 -3 3⁄8 – 24 3⁄8 0.38 11⁄32 0.34
1⁄4 -4 7⁄16 – 20 7⁄16 0.44 13⁄32 0.39
5⁄16 -5 1⁄2 – 20 1⁄2 0.50 15⁄32 0.45
3⁄8 -6 9⁄16 – 18 9⁄16 0.56 17⁄32 0.51
1⁄2 -8 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 11⁄16 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

SAE 45° Flare (SAE J512)

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 5⁄16 – 24 5⁄16 0.31 9⁄32 0.27
3⁄16 -3 3⁄8 – 24 3⁄8 0.38 11⁄32 0.34
1⁄4 -4 7⁄16 – 20 7⁄16 0.44 13⁄32 0.39
5⁄16 -5 1⁄2 – 20 1⁄2 0.50 15⁄32 0.45
3⁄8 -6 5⁄8 – 18 5⁄8 0.63 9⁄16 0.57
1⁄2 -8 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 11⁄16 1.06 1 0.99
7⁄8 -14 1 1⁄4 – 12 1 1⁄4 1.25 1 5⁄32 1.16
1 -16 1 3⁄8 – 12 1 3⁄8 1.38 1 9⁄32 1.29

SAE Straight Thread O-ring (O-Ring Boss)

SAE J1926-1 and ISO 11296-1
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 5⁄16 – 24 5⁄16 0.31 9⁄32 0.27
3⁄16 -3 3⁄8 – 24 3⁄8 0.38 11⁄32 0.34
1⁄4 -4 7⁄16 – 20 7⁄16 0.44 13⁄32 0.39
5⁄16 -5 1⁄2 – 20 1⁄2 0.50 15⁄32 0.45
3⁄8 -6 9⁄16 – 18 9⁄16 0.56 17⁄32 0.51
1⁄2 -8 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

Flareless Compression (SAE J514)

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 5⁄16 – 24 5⁄16 0.31 9⁄32 0.27
3⁄16 -3 3⁄8 – 24 3⁄8 0.38 11⁄32 0.34
1⁄4 -4 7⁄16 – 20 7⁄16 0.44 13⁄32 0.39
5⁄16 -5 1⁄2 – 20 1⁄2 0.50 15⁄32 0.45
3⁄8 -6 9⁄16 – 18 9⁄16 0.56 17⁄32 0.51
1⁄2 -8 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 11⁄16 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

O-Ring Face Seal (SAE J1453)

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄4 -4 9⁄16 – 18 9⁄16 0.56 17⁄32 0.51
3⁄8 -6 11⁄16 – 16 11⁄16 0.69 5⁄8 0.63
1⁄2 -8 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 13⁄16 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

SAE Inverted Flare (SAE J512)

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 5⁄16 – 28 5⁄16 0.31 9⁄32 0.27
3⁄16 -3 3⁄8 – 24 3⁄8 0.38 11⁄32 0.34
1⁄4 -4 7⁄16 – 24 7⁄16 0.44 13⁄32 0.39
5⁄16 -5 1⁄2 – 20 1⁄2 0.50 15⁄32 0.45
3⁄8 -6 5⁄8 – 18 5⁄8 0.63 9⁄16 0.57
7⁄16 -7 11⁄16 – 18 11⁄16 0.69 5⁄8 0.63
1⁄2 -8 3⁄4 – 18 3⁄4 0.75 23⁄32 0.70
5⁄8 -10 7⁄8 – 18 7⁄8 0.88 13⁄16 0.81
3⁄4 -12 1 1⁄16 – 16 1 1⁄16 1.06 1 1.00

Four-Bolt Flange (SAE J518 and ISO 6162)

Inch size Dash size Code 61 Bolt Spacing Code 61 Flange O.D. Code 62 Bolt Spacing Code 62 Flange O.D.
1⁄2 -8 1 1⁄2 1 3⁄16 1 19⁄32 1 1⁄4
3⁄4 -12 1 7⁄8 1 1⁄2 2 1 5⁄8
1 -16 2 1⁄16 1 3⁄4 2 1⁄4 1 7⁄8
1 1⁄4 -20 2 5⁄16 2 2 5⁄8 2 1⁄8
1 1⁄2 -24 2 3⁄4 2 3⁄8 3 1⁄8 2 1⁄2
2 -32 3 1⁄16 2 13⁄32 3 13⁄16 3 1⁄8
2 1⁄2 -40 3 1⁄2 3 5⁄16 n/a n/a
3 -48 4 3⁄16 4 n/a n/a

O-Ring Pilot Threads

Inch size Dash size Male Thread Female thread
Thread size Thread O.D. Thread size Thread I.D.
3⁄8 -6 5⁄8 – 18 5⁄8 5⁄8 – 18 9⁄16
1⁄2 -8 3⁄4 – 18 3⁄4 3⁄4 – 16 11⁄16
5⁄8 -10 7⁄8 – 18 7⁄8 7⁄8 – 14 13⁄16
3⁄4 -12 1 1⁄16 – 16 1 1⁄16 1 1⁄16 – 14 1
Inch size Dash size Long pilot Short pilot
Bead O.D. (in) Pilot Length (in) Bead O.D. (in) Pilot Length (in)
3⁄8 -6 0.52 0.28 0.52 0.19
1⁄2 -8 0.64 0.39 0.64 0.19
5⁄8 -10 0.77 0.39 0.77 0.19
3⁄4 -12 0.91 0.39 0.91 0.19

International Connections

British Standard Pipe Parallel (BSPP)

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 1⁄8 – 28 3⁄8 0.38 11⁄32 0.35
1⁄4 -4 1⁄4 – 19 33⁄64 0.52 15⁄32 0.47
3⁄8 -6 3⁄8 – 19 21⁄32 0.65 19⁄32 0.60
1⁄2 -8 1⁄2 – 14 13⁄16 0.82 3⁄4 0.75
5⁄8 -10 5⁄8 – 14 7⁄8 0.88 13⁄16 0.80
3⁄4 -12 3⁄4 – 14 1 1⁄32 1.04 31⁄32 0.97
1 -16 1 – 11 1 5⁄16 1.30 1 7⁄32 1.22
1 1⁄4 -20 1 1⁄4 – 11 1 21⁄32 1.65 1 9⁄16 1.56
1 1⁄2 -24 1 1⁄2 – 11 1 7⁄8 1.88 1 25⁄32 1.79
2 -32 2 – 11 2 11⁄32 2.35 2 1⁄4 2.26

British Standard Pipe Tapered (BSPT)

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 1⁄8 – 28 3⁄8 0.38 11⁄32 0.35
1⁄4 -4 1⁄4 – 19 33⁄64 0.52 15⁄32 0.47
3⁄8 -6 3⁄8 – 19 21⁄32 0.65 19⁄32 0.60
1⁄2 -8 1⁄2 – 14 13⁄16 0.82 3⁄4 0.75
5⁄8 -10 5⁄8 – 14 7⁄8 0.88 13⁄16 0.80
3⁄4 -12 3⁄4 – 14 1 1⁄32 1.04 31⁄32 0.97
1 -16 1 – 11 1 5⁄16 1.30 1 7⁄32 1.22
1 1⁄4 -20 1 1⁄4 – 11 1 21⁄32 1.65 1 9⁄16 1.56
1 1⁄2 -24 1 1⁄2 – 11 1 7⁄8 1.88 1 25⁄32 1.79
2 -32 2 – 11 2 11⁄32 2.35 2 1⁄4 2.26

Flat Face Port with Metric Threads (ISO 9974-1)

Metric Thread Size Male Thread O.D. (mm) Female Thread I.D (mm)
M8 x 1.0 8 7
M10 x 1.0 10 9
M12 x 1.5 12 10.5
M14 x 1.5 14 12.5
M16 x 1.5 16 14.5
M18 x 1.5 18 16.5
M20 x 1.5 20 18.5
M22 x 1.5 22 20.5
M24 x 1.5 24 22.5
M26 x 1.5 26 24.5
M27 x 2.0 27 25
M33 x 2.0 33 31
M36 x 2.0 36 34
M42 x 2.0 42 40
M45 x 2.0 45 43
M48 x 2.0 48 46

ISO 6149 Metric Port and Stud Ends

ISO 261 threads & O-ring seal
Metric Thread Size Male Thread O.D. (mm) Female Thread I.D (mm)
M8 x 1.0 8 7
M10 x 1.0 10 9
M12 x 1.5 12 10.5
M14 x 1.5 14 12.5
M16 x 1.5 16 14.5
M18 x 1.5 18 16.5
M22 x 1.5 22 20.5
M27 x 2.0 27 25
M33 x 2.0 33 31
M42 x 2.0 42 40
M48 x 2.0 48 46
M60 x 2.0 60 58

Metric 60° Cone

DIN 7631
Pipe/Tube O.D. (mm) Metric Thread Size Male Thread O.D. (mm) Female Thread I.D (mm)
6 M12 x 1.5 12 10.5
8 M14 x 1.5 14 12.5
10 M16 x 1.5 16 14.5
12 M18 x 1.5 18 16.5
15 M22 x 1.5 22 20.5
18 M26 x 1.5 26 24.5
22 M30 x 1.5 30 28.5
28 M38 x 1.5 38 36.5
35 M45 x 1.5 45 43.5
52 M52 x 1.5 52 50.5

Metric Tube Compression (DIN 2353 24° Cone)

DIN 2353 L Tube O.D.(mm) DIN 2353 S Tube O.D. (mm) Metric Thread Size Male Thread O.D. (mm) Female Thread I.D (mm)
6 M12 x 1.5 12 10.5
8 6 M14 x 1.5 14 12.5
10 8 M16 x 1.5 16 14.5
12 10 M18 x 1.5 18 16.5
12 M20 x 1.5 20 18.5
15 14 M22 x 1.5 22 20.5
16 M24 x 1.5 24 22.5
18 M26 x 1.5 26 24.5
22 20 M30 x 2.0 30 28
28 25 M36 x 2.0 36 34
30 M42 x 2.0 42 40
35 M45 x 2.0 45 43
42 38 M52 x 2.0 52 50

Japanese Industrial Standard JIS 300 Flare

Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
1⁄8 -2 1⁄8 – 28 3⁄8 0.38 11⁄32 0.35
1⁄4 -4 1⁄4 – 19 33⁄64 0.52 15⁄32 0.47
3⁄8 -6 3⁄8 – 19 21⁄32 0.65 19⁄32 0.60
1⁄2 -8 1⁄2 – 14 13⁄16 0.82 3⁄4 0.75
5⁄8 -10 5⁄8 – 14 7⁄8 0.88 13⁄16 0.80
3⁄4 -12 3⁄4 – 14 1 1⁄32 1.04 31⁄32 0.97
1 -16 1 – 11 1 5⁄16 1.30 1 7⁄32 1.22
1 1⁄4 -20 1 1⁄4 – 11 1 21⁄32 1.65 1 9⁄16 1.56
1 1⁄2 -24 1 1⁄2 – 11 1 7⁄8 1.88 1 25⁄32 1.79
2 -32 2 – 11 2 11⁄32 2.35 2 1⁄4 2.26

Komatsu 30° Flare (JIS Metric)

Dash Size Metric Thread Size Male Thread O.D. (mm) Female Thread I.D (mm)
-6 M18 x 1.5 18 16.5
-8 M22 x 1.5 22 20.5
-10 M24 x 1.5 24 22.5
-12 M30 x 1.5 30 28.5
-16 M33 x 1.5 33 31.5
-20 M36 x 1.5 36 34.5
-24 M42 x 1.5 42 40.5