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	11⁄16	1.05	1	0.98
1	-16	111⁄2	15⁄16	1.32	11⁄4	1.24
11⁄4	-20	111⁄2	121⁄32	1.66	119⁄32	1.58
11⁄2	-24	111⁄2	129⁄32	1.90	113⁄16	1.82
2	-32	111⁄2	23⁄8	2.38	25⁄16	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	11⁄16	1.05	1	0.98
1	-16	111⁄2	15⁄16	1.32	11⁄4	1.24
11⁄4	-20	111⁄2	121⁄32	1.66	119⁄32	1.58
11⁄2	-24	111⁄2	129⁄32	1.90	113⁄16	1.82
2	-32	111⁄2	23⁄8	2.38	25⁄16	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	11⁄16 – 12	11⁄16	1.06	1	0.98
7⁄8	-14	13⁄16 – 12	13⁄16	1.19	11⁄8	1.10
1	-16	15⁄16-12	15⁄16	1.31	11⁄4	1.23
11⁄4	-20	15⁄8 – 12	15⁄8	1.63	19⁄16	1.54
11⁄2	-24	17⁄8 – 12	17⁄8	1.88	113⁄16	1.79
2	-32	21⁄2 – 12	21⁄2	2.50	27⁄16	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	11⁄16 – 14	11⁄16	1.06	1	0.99
7⁄8	-14	11⁄4 – 12	11⁄4	1.25	15⁄32	1.16
1	-16	13⁄8 – 12	13⁄8	1.38	19⁄32	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	11⁄16 – 12	1 1⁄16	1.06	1	0.98
7⁄8	-14	13⁄16 – 12	13⁄16	1.19	11⁄8	1.10
1	-16	15⁄16 – 12	15⁄16	1.31	11⁄4	1.23
11⁄4	-20	15⁄8 – 12	15⁄8	1.63	19⁄16	1.54
11⁄2	-24	17⁄8 – 12	17⁄8	1.88	113⁄16	1.79
2	-32	21⁄2 – 12	21⁄2	2.50	27⁄16	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	11⁄16 – 12	11⁄16	1.06	1	0.98
7⁄8	-14	13⁄16 – 12	13⁄16	1.19	11⁄8	1.10
1	-16	15⁄16 – 12	15⁄16	1.31	11⁄4	1.23
11⁄4	-20	15⁄8 – 12	15⁄8	1.63	19⁄16	1.54
11⁄2	-24	17⁄8 – 12	17⁄8	1.88	113⁄16	1.79
2	-32	21⁄2 – 12	21⁄2	2.50	27⁄16	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	13⁄16 – 12	13⁄16	1.19	11⁄8	1.11
1	-16	17⁄16 – 12	17⁄16	1.44	13⁄4	1.36
11⁄4	-20	111⁄16 – 12	111⁄16	1.69	15⁄8	1.61
11⁄2	-24	2-12	2	2.00	115⁄16	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	11⁄16 – 16	11⁄16	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	11⁄2	13⁄16	119⁄32	11⁄4
3⁄4	-12	17⁄8	11⁄2	2	15⁄8
1	-16	21⁄16	13⁄4	21⁄4	17⁄8
11⁄4	-20	25⁄16	2	25⁄8	21⁄8
11⁄2	-24	23⁄4	23⁄8	31⁄8	21⁄2
2	-32	31⁄16	213⁄32	313⁄16	31⁄8
21⁄2	-40	31⁄2	35⁄16	n/a	n/a
3	-48	43⁄16	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	11⁄16 – 16	11⁄16	11⁄16 – 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	11⁄32	1.04	31⁄32	0.97
1	-16	1 – 11	15⁄16	1.30	17⁄32	1.22
11⁄4	-20	11⁄4 – 11	121⁄32	1.65	19⁄16	1.56
11⁄2	-24	11⁄2 – 11	17⁄8	1.88	125⁄32	1.79
2	-32	2 – 11	211⁄32	2.35	21⁄4	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	11⁄32	1.04	31⁄32	0.97
1	-16	1 – 11	15⁄16	1.30	17⁄32	1.22
11⁄4	-20	11⁄4 – 11	121⁄32	1.65	19⁄16	1.56
11⁄2	-24	11⁄2 – 11	17⁄8	1.88	125⁄32	1.79
2	-32	2 – 11	211⁄32	2.35	21⁄4	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	11⁄32	1.04	31⁄32	0.97
1	-16	1 – 11	15⁄16	1.30	17⁄32	1.22
11⁄4	-20	11⁄4 – 11	121⁄32	1.65	19⁄16	1.56
11⁄2	-24	11⁄2 – 11	17⁄8	1.88	125⁄32	1.79
2	-32	2 – 11	211⁄32	2.35	21⁄4	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