INTERNATIONAL CONNECTIONS

British Standard Pipe

British Standard Pipe connections come in two different types: British Standard Pipe Parallel (BSPP); and British Standard Pipe Tapered (BSPT).


British Standard Pipe Parallel (BSPP) :

This connection has a male half with a 300 seat, and a female half with a rotating tapered nose, that forms the seal.

NOTE: The male connector may appear to look like the male American National Pipe Straight Mechanical, or NPSM; however, their thread pitches are not the same, and are not compatible.


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) :

These are connectors where the seal is made between a tapered male and female thread.

NOTE: Although the BSPT male connector appears to look like the National Pipe Tapered Fuel, or NPTF; their thread size and form are not the same and therefore they are not compatible.


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 British Standard Pipe Parallel Threads (ISO 1179-1) :

DIN 3852, Part 2

These connectors form their seal between the male half and the smooth surface of the female half, using a combination of rings or washers between their parallel threads.



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

DIN 3852, Part 1

These connectors form their seal between the male half and the smooth surface of the female half, using a combination of rings or washers between their parallel threads.

ISO 261 Metric threads


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

Connection with both male and female halves having straight threads. The female half has a smooth surface and a chamfer, and the male half has an O-ring. That O-ring compresses against the female chamfer to form the seal. . The male and female threads mesh to form a solid connection.

NOTE: Except for the metric threads on the ISO 6149, it connects in the same way as the SAE J1926-1O-ring Boss.


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

These connectors commonly found in hydraulic systems. The female connector has a globeseal seat, while the male has a 60° recessed cone (which forms the seal against the female's tapered nose). Both male and female have straight threads, that mesh to form a solid connection.


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 Compression Fittings (DIN 2353 24° Cone) :

Both male and female connectors have straight threads, with the male having a 240 cone, and the three female connectors a sealing surface. The 240 cone (male) and the sealing surfaces (females) form the seal.

There are two types of connectors - the DIN 2353 L light class, and the DIN 2353 S heavy class. The chart below lists tube sizes and thread dimensions for each class:


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 :

Both male and female connectors have straight threads, however the female has a 300 seat, and the male a 30° seat. (Although the 30° seat and BSPP-like thread dimensions differ from the American 37° Flare, the connections are very much alike.)


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) :

These connectors are commonly used on Komatsu equipment. With a 30° seat and parallel metric threads, it's not unlike the JIS 300 flare (the difference being the metric threads vs. the BSPP-like thread dimensions on the JIS 300).


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


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


National Pipe Straight Mechanical (NPSM) :

A connection where the male thread (with a 300 internal chamfer), and female thread (with an inverted 300 seat), are both straight. When the two are threaded together, the tapered seat forms a leak-resistant connection. These connections are used widely across fluid power systems.

NOTE: A NPSM female and a chamfered NPTF male can form a seal together.


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) :

This connection is widely used in hydraulic systems, and both the male and female connectors have straight threads and a 37º flare seat. The straight threads of each half hold the connection together, sealing the flared seats.

NOTE: Most SAE J514 threads are exactly the same as the SAE 45º flare threads, however their seating angles differ.


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) :

Typically used with low pressure systems like refrigerant lines, fuel lines, and automotive applications, the SAE male and female connectors similarly have a 45° flare seat which forms the seal. The threads of both halves mesh together for a strong mechanical connection. The SAE 45° Flare connectors are exactly the same as the JIC 37° Flare connectors, however their seating angles differ.


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

A connection commonly found in high pressure hydraulic systems. While both halves have straight threads, the female has a sealing face and chamfer, and the male has an O-ring which when compressed into the opposing chamfer, forms the seal. The male and female threads mesh to form a solid connection.


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


Compression Tube Fittings (SAE J514) :

The female connector includes a compression sleeve, a female nut, and a tube. The male connector has a 240 seat, which makes the seal with the female compression sleeve (the seal forms on the female side between the tubing and the compression sleeve). With non-flared tube fittings with straight threads, the male and female threads mesh to form a solid connection.


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) :

These fittings join to form a highly leak resistive connection, in applications up to 6000 psi. Both halves have a straight thread, with the female having a flat surface and the male connector containing an O-ring. The seal is made when the O-ring on the male compresses against the flat surface of the female. The outside nut on the female connector holds the connection together.


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) :

These connectors are widely used in the automotive industry. With the flared male tubing having a 450 seat, and the machined connector a 420 seat, the sealing surface is formed with the 420 seat on the end of the flare of the female connector. The male and female threads mesh to form a solid connection.


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) :

These commonly used in fluid power systems, and suitable for joining 1/2" - 3" hose or tube. The seal forms between the flat surface of the female port and the O-ring of the male (seated in the ring groove). A split clamp, using 4 bolts, hold the male/female together.

Note that there are two types of SAE J518 flanges available: standard pressure (code 61), and high pressure (code 62).


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 :

These connections are typically seen in automotive and commercial air conditioning applications. Both halves of the connection have a pilot, making the seal by compressing the O-ring. The male and female threads mesh to form a solid connection.


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

British Standard Pipe connections come in two different types: British Standard Pipe Parallel (BSPP); and British Standard Pipe Tapered (BSPT).


British Standard Pipe Parallel (BSPP) :

This connection has a male half with a 300 seat, and a female half with a rotating tapered nose, that forms the seal.

NOTE: The male connector may appear to look like the male American National Pipe Straight Mechanical, or NPSM; however, their thread pitches are not the same, and are not compatible.


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) :

These are connectors where the seal is made between a tapered male and female thread.

NOTE: Although the BSPT male connector appears to look like the National Pipe Tapered Fuel, or NPTF; their thread size and form are not the same and therefore they are not compatible.


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 British Standard Pipe Parallel Threads (ISO 1179-1) :

DIN 3852, Part 2

These connectors form their seal between the male half and the smooth surface of the female half, using a combination of rings or washers between their parallel threads.



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

DIN 3852, Part 1

These connectors form their seal between the male half and the smooth surface of the female half, using a combination of rings or washers between their parallel threads.

ISO 261 Metric threads


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

Connection with both male and female halves having straight threads. The female half has a smooth surface and a chamfer, and the male half has an O-ring. That O-ring compresses against the female chamfer to form the seal. . The male and female threads mesh to form a solid connection.

NOTE: Except for the metric threads on the ISO 6149, it connects in the same way as the SAE J1926-1O-ring Boss.


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

These connectors commonly found in hydraulic systems. The female connector has a globeseal seat, while the male has a 60° recessed cone (which forms the seal against the female's tapered nose). Both male and female have straight threads, that mesh to form a solid connection.


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 Compression Fittings (DIN 2353 24° Cone) :

Both male and female connectors have straight threads, with the male having a 240 cone, and the three female connectors a sealing surface. The 240 cone (male) and the sealing surfaces (females) form the seal.

There are two types of connectors - the DIN 2353 L light class, and the DIN 2353 S heavy class. The chart below lists tube sizes and thread dimensions for each class:


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 :

Both male and female connectors have straight threads, however the female has a 300 seat, and the male a 30° seat. (Although the 30° seat and BSPP-like thread dimensions differ from the American 37° Flare, the connections are very much alike.)


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) :

These connectors are commonly used on Komatsu equipment. With a 30° seat and parallel metric threads, it's not unlike the JIS 300 flare (the difference being the metric threads vs. the BSPP-like thread dimensions on the JIS 300).


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