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FLUID PORT AND CONNECTOR

Identification Guide

 

Quick Links

Abbreviations

Introduction

Fluid port and connector identification tools

American Connections

National Pipe Tapered Fuel (NPTF)

National Pipe straight mechanical (NSPM)

JIC 37° Flare (SAE J514)

SAE 45° Flare (SAE J512)

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

Flareless compression (SAE J514)

O-Ring Face Seal (SAE J1453)

SAE Inverted Flare (SAE J512)

Four-Bolt Flange (SAE J518 and ISO 6162)

O-Ring Pilot Threads

International Connections

British Standard Pipe

British Standard Pipe Parallel (BSPP)

British Standard Pipe Tapered (BSPT))

Flat Face Port with British Standard Pipe Parallel Threads (ISO 1179-1)

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

ISO 6149 Metric Port and Stud Ends

Metric 600o Cone

Metric tube compression (DIN 2353 240 Cone)

Japanese Industrial Standard JIS 300 Flare

Komatsu 30° Flare (JIS Metric)

 

Abbreviations used for ID or the fittings and ports;

NPTF National Pipe Tapered Fuel

NPSM National Pipe Straight Mechanical

ISO International Standards Organization

SAE Society of Automotive Engineers

JIC Joint Industrial Council

NFPA National Fluid Power Association

BSP British Standard Pipe

DIN Deutsche Industrial Norme

JIS Japanese Industrial Standard

BSPT British Standard Pipe Tapered

BSPP British Standard Pipe Parallel

Introduction

Because connectors and ports have many applications in fluid piping systems, you need to correctly identify them before adding or replacing them on a tube or hose, in your specific application.

 

 

Manufacturers use identifiers such as ASME B1 .1 and ISO 261, to classify the main thread characteristics: pitch, angle, diameter, and form. Some organizations that are developing these, are the International Organization for Standardization, SAE International, British Association, and Deutsches Institut für Normung, and the American Society of Manufacturing Engineers, American National Standards Institute.

 

Fluid port and connector identification tools

Calipers:

Used for measuring inner and outer diameters of threads

Thread Pitch Gauge:

Used to measure the amount of threads per inch, as well as the thread to thread spacing in metric applications.

Accurate measurement of threads

Before you start measuring the threads of your fluid pipe or tube, ensure that they are in good conditions. Distorted or worn out threads can give you inaccurate measurements. After confirming that your threads are in good conditions, measure their diameter and record. An I.D./O.D. caliper is a suitable tool for this. Match the dimensions provided in this guide with your recorded measurements.

It is important to note that your measurements may not accurately match with the values provided in this guide. The slight differences are mainly caused by manufacturing tolerances.

After measuring the diameter of your threads, determine their spacing in threads per inch. In the case of metric connections, measure the thread-to-thread distances. To get an accurate value, ensure that the thread pitch gauge is fitting well on the threads. Record the values and compare your measurements with the figures provided in this guide.

Accurate measurement of four-bolt flanges

Begin by using a caliper to measure the port hole diameter the bolt. Once you make a note of that, measure the distance from center to center of the bolt holes, noting the longest spacing.

Dash numbers

The sizes of tubes and fluid pipes are generally identified by abbreviations known as dash numbers, and are commonly used when ordering parts. When using a dash number to identify a fluid pipe or a tube, the numerator part of the fraction is just used. The denominator (which is always 16) is generally ignored. For example, 8/16" or 1/2" equates to size -8 . Note: dash numbers are nominal.

 

Since metric measurements give the true sizes of a tube or a fluid pipe, dash numbers do not apply for them. For example, for M12x1.0, the outer diameter of the threads is 12 mm with a 1.0 mm spacing between threads,

 

American Connections

National Pipe Tapered Fuel (NPTF)

The male and female threads connect and a seal is formed when the two are mated together (i.e. threads deformation). This is known as a dry seal thread. If additional sealing is required, teflon and pipe dope can be applied. The National Fluid Power Association (NFPA) does not recommend the connection for hydraulic applications, however it is commonly found in fluid piping systems


Note: Both the NPTF and BSPT connectors appear similar, however the two are 
not interchangeable.


 
Inch size Dash size Threads per Inch Male Thread O.D. (in) Female thread O.D (in)
18 -2 27 1332 0.41 38 0.38
14 -4 18 1732 0.54 12 0.49
38 -6 18 1116 0.68 58 0.63
12 -8 14 2732 0.84 2532 0.77
34 -12 14 116 1.05 1 0.98
1 -16 11 12 516 1.32 14 1.24
14 -20 11 12 2132 1.66 1932 1.58
12 -24 11 12 2932 1.90 13⁄16 1.82
2 -32 11 12 38 2.38 516 2.30


 

National Pipe straight mechanical (NPSM)

Both male and female NSPM connectors' threads are straight, while the male has a 300 internal chamfer, the female has an inverted 300 seat. A mechanical connection is made when the both male and female are mated together. The tapered seat creates a leak-resistant connection, and are commonly found in fluid power systems.


Note: A NPSM female can seal together with a chamfered NPTF male.


 
Inch size Dash size Threads per Inch Male Thread O.D. (in) Female thread O.D (in)
18 -2 27 1332 0.41 38 0.38
14 -4 18 1732 0.54 12 0.49
38 -6 14 1116 0.68 58 0.63
12 -8 14 2732 0.84 2532 0.77
34 -12 14 116 1.05 1 0.98
1 -16 11 12 516 1.32 14 1.24
14 -20 11 12 2132 1.66 1932 1.58
12 -24 11 12 2932 1.90 13⁄16 1.82
2 -32 11 12 38 2.38 516 2.30


 

JIC 37° Flare (SAE J514)

Widely found in hydraulic systems, both the JIC male and JIC female of this connection have a 37º flare seat as well as straight threads. The flare seats of the male and female seal together when the straight threads are joined. The straight threads of the each half hold the connection together mechanically.

Note: While most SAE J514 threads look identical to SAE 45º flare threads, their seating angles do not match.


 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 516 - 24 516 0.31 932 0.27
316 -3 38 - 24 38 0.38 1132 0.34
14 -4 716 - 20 716 0.44 1332 0.39
516 -5 12 - 20 12 0.50 1532 0.45
38 -6 916 - 18 916 0.56 1732 0.51
12 -8 34 - 16 34 0.75 1116 0.69
58 -10 78 - 14 78 0.88 1316 0.81
34 -12 116 - 12 1116 1.06 1 0.98
78 -14 316 - 12 316 1.19 18 1.10
1 -16 516-12 516 1.31 14 1.23
14 -20 58 - 12 58 1.63 916 1.54
12 -24 78 - 12 78 1.88 1316 1.79
2 -32 12 - 12 12 2.50 716 2.42


 

SAE 45° Flare (SAE J512)

These connectors are widely found in low pressure applications like refrigerant and fuel lines, as well as automotive piping applications. Both halves have a 45° flare seat, and the threads of the each connector engage together to form a tight mechanical connection, with the seal forming on the 45° flare seat.

Note: SAE 45° Flare connectors are identical to JIC 37° Flare connectors, except for the angles of the seats.


 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 516 - 24 516 0.31 932 0.27
316 -3 38 - 24 38 0.38 1132 0.34
14 -4 716 - 20 716 0.44 1332 0.39
516 -5 12 - 20 12 0.50 1532 0.45
38 -6 58 - 18 58 0.63 916 0.57
12 -8 34 - 16 34 0.75 1116 0.69
58 -10 78 - 14 78 0.88 1316 0.81
34 -12 116 - 14 1116 1.06 1 0.99
78 -14 14 - 12 14 1.25 532 1.16
1 -16 38 - 12 38 1.38 932 1.29


 

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

SAE J1926-1 and ISO 11296-1

The female port of the O-Ring Boss has a sealing face, chamfer, and a straight thread. The male connector has an O-ring and a straight thread. The seal is made when the O-ring is squeezed into the chamfer. The male and female threads bind together to make a mechanically strong connection. This connection is common in high pressure hydraulic systems.



 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 516 - 24 516 0.31 932 0.27
316 -3 38 - 24 38 0.38 1132 0.34
14 -4 716 - 20 716 0.44 1332 0.39
516 -5 12 - 20 12 0.50 1532 0.45
38 -6 916 - 18 916 0.56 1732 0.51
12 -8 34 - 16 34 0.75 1116 0.69
58 -10 78 - 14 78 0.88 1316 0.81
34 -12 116 - 12 1116 1.06 1 0.98
78 -14 316 - 12 316 1.19 18 1.10
1 -16 516 - 12 516 1.31 14 1.23
14 -20 58 - 12 58 1.63 916 1.54
12 -24 78 - 12 78 1.88 1316 1.79
2 -32 12 - 12 12 2.50 716 2.42


 

Flareless Compression (SAE J514)

The male half of this connection has a 240 seat with a straight thread. The female has a compression sleeve with a straight thread. Along with the sleeve, a female nut and tube partly form the female connection. With the male half, the seal forms between the 24O seat and the compression sleeve. With the female half, the seal forms between the tubing and compression sleeve. The threads mesh together to form a mechanically strong bond.


 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 516 - 24 516 0.31 932 0.27
316 -3 38 - 24 38 0.38 1132 0.34
14 -4 716 - 20 716 0.44 1332 0.39
516 -5 12 - 20 12 0.50 1532 0.45
38 -6 916 - 18 916 0.56 1732 0.51
12 -8 34 - 16 34 0.75 1116 0.69
58 -10 78 - 14 78 0.88 1316 0.81
34 -12 116 - 12 1116 1.06 1 0.98
78 -14 316 - 12 316 1.19 18 1.10
1 -16 516 - 12 516 1.31 14 1.23
14 -20 58 - 12 58 1.63 916 1.54
12 -24 78 - 12 78 1.88 1316 1.79
2 -32 12 - 12 12 2.50 716 2.42


 

O-Ring Face Seal (SAE J1453)

This connection forms an impressive leak resistance and can be used in applications up to 6000 psi. The male half of the connection has an O-ring with a straight thread. The female half has a machined flat surface with a straight thread. A seal takes place when the O-ring on the male end is squeezed onto the female flat surface seat. The swivel nut on the female half holds the connection together.



 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
14 -4 916 - 18 916 0.56 1732 0.51
38 -6 1116 - 16 1116 0.69 58 0.63
12 -8 1316 - 16 1316 0.82 34 0.75
58 -10 1 - 14 1 1.00 1516 0.93
34 -12 316 - 12 1316 1.19 18 1.11
1 -16 716 - 12 716 1.44 34 1.36
14 -20 1116 - 12 1116 1.69 58 1.61
12 -24 2-12 2 2.00 1516 1.92


 

SAE Inverted Flare (SAE J512)

Widely used in automotive systems, the inverted flare connection features a machined male connector with a 420 seat, and a flared male tubing with a 450 seat. The female side has a 420 seat that provides a sealing surface. The threads connect together to make a mechanically strong bond.


 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 516 - 28 516 0.31 932 0.27
316 -3 38 - 24 38 0.38 1132 0.34
14 -4 716 - 24 716 0.44 1332 0.39
516 -5 12 - 20 12 0.50 1532 0.45
38 -6 58 - 18 58 0.63 916 0.57
716 -7 1116 - 18 1116 0.69 58 0.63
12 -8 34 - 18 34 0.75 2332 0.70
58 -10 78 - 18 78 0.88 1316 0.81
34 -12 116 - 16 116 1.06 1 1.00


 

Four-Bolt Flange (SAE J518 and ISO 6162)

Commonly found in fluid power systems, the Four-Bolt Flange works well connecting 1/2" to 3" hose and tube. The seal forms between the O-ring on the male half and the smooth face of the female port (with the O-ring seating on the ring groove of the male). Two clamp halves, held by four bolts, hold the connection together.


These are available in two pressure groups: standard (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.
12 -8 12 316 1932 14
34 -12 78 12 2 58
1 -16 116 34 14 78
14 -20 516 2 58 18
12 -24 34 38 18 12
2 -32 116 1332 1316 18
12 -40 12 516 n/a n/a
3 -48 316 4 n/a n/a


 

O-Ring Pilot Threads

This connection is widely found in automotive and commercial air conditioning applications. Both male and female halves have a pilot (could be long or short), and the seal is made when the O-ring is compressed. Threads tightly mesh together to form a strong mechanical bond.


 
Inch size Dash size Male Thread Female thread
Thread size Thread O.D. Thread size Thread I.D.
38 -6 58 - 18 58 58 - 18 916
12 -8 34 - 18 34 34 - 16 1116
58 -10 78 - 18 78 78 - 14 1316
34 -12 116 - 16 116 116 - 14 1


 
Inch size Dash size Long pilot Short pilot
Bead O.D. (in) Pilot Length (in) Bead O.D. (in) Pilot Length (in)
38 -6 0.52 0.28 0.52 0.19
12 -8 0.64 0.39 0.64 0.19
58 -10 0.77 0.39 0.77 0.19
34 -12 0.91 0.39 0.91 0.19




 

International Connections

British Standard Pipe

British connections are available in two categories: British Standard Pipe Parallel (BSPP), and British Standard Pipe Tapered (BSPT).


 

British Standard Pipe Parallel (BSPP)

The male end has a 300 seat, which tapered nose of the female swivel makes the seal with.

Note: Although the male end is comparable to the American National Pipe Straight Mechanical (NPSM) male, they not interchangeable, due to their different thread pitches.


 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 18 - 28 38 0.38 1132 0.35
14 -4 14 - 19 3364 0.52 1532 0.47
38 -6 38 - 19 2132 0.65 1932 0.60
12 -8 12 - 14 1316 0.82 34 0.75
58 -10 58 - 14 78 0.88 1316 0.80
34 -12 34 - 14 132 1.04 3132 0.97
1 -16 1 - 11 516 1.30 732 1.22
14 -20 14 - 11 2132 1.65 916 1.56
12 -24 12 - 11 78 1.88 2532 1.79
2 -32 2 - 11 1132 2.35 14 2.26


 

British Standard Pipe Tapered (BSPT)

The tapered male connects with a tapered female, with the seal forming in the threads.

Note: Although the BSPT male end is comparable to the National Pipe Tapered Fuel (NPTF), they are not interchangeable, due to their different size and thread form.


 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 18 - 28 38 0.38 1132 0.35
14 -4 14 - 19 3364 0.52 1532 0.47
38 -6 38 - 19 2132 0.65 1932 0.60
12 -8 12 - 14 1316 0.82 34 0.75
58 -10 58 - 14 78 0.88 1316 0.80
34 -12 34 - 14 132 1.04 3132 0.97
1 -16 1 - 11 516 1.30 732 1.22
14 -20 14 - 11 2132 1.65 916 1.56
12 -24 12 - 11 78 1.88 2532 1.79
2 -32 2 - 11 1132 2.35 14 2.26


 

Flat Face Port with British Standard Pipe Parallel Threads (ISO 1179-1)

DIN 3852, Part 2

The parallel threads make a seal using a number of different rings or washers. The seal forms between the male end, and the smooth flat surface on the female end.



 

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

DIN 3852, Part 1

The parallel threads make a seal using a number of different rings or washers. The seal forms between the male end, and the smooth flat surface on the female end.

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

The male half has an O-ring and a straight thread, while the female half has a machined surface, a chamfer, and a straight thread. The O-ring on the male half compresses on the chamfer of the female port, to make the seal. (The ISO 6149 is the same as the SAE J1926-1O-ring Boss, except the ISO 6149 has metric threads.) The straight threads mesh to form a strong mechanical bond.


 
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

The male connector has a 60° recessed cone and a straight thread; the female has a straight thread as well, and a globeseal seat. The seal forms between the recessed cone on the male and the tapered nose of the female. The threads of both halves mesh to form a strong mechanical bond. This connection is common in hydraulic systems.


 
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)

The male connector has a 240 Cone with a straight thread, while the three female connectors have straight threads with a sealing surface. The seal forms between the cone on the male and the sealing areas on the females.

Fittings are available in two categories: DIN 2353 L (light) and DIN 2353 S (heavy) classes. Each has its own tube sizes and thread dimensions as shown in the following table:


 
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

The male half has a 30° seat with a straight thread, while the female has a 300 seat with a straight thread as well. This connection and the 37° Flare are alike, however it's 30° seat and BSPP-like thread dimensions make it different from the American 37° Flare.


 
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread O.D (in)
18 -2 18 - 28 38 0.38 1132 0.35
14 -4 14 - 19 3364 0.52 1532 0.47
38 -6 38 - 19 2132 0.65 1932 0.60
12 -8 12 - 14 1316 0.82 34 0.75
58 -10 58 - 14 78 0.88 1316 0.80
34 -12 34 - 14 132 1.04 3132 0.97
1 -16 1 - 11 516 1.30 732 1.22
14 -20 14 - 11 2132 1.65 916 1.56
12 -24 12 - 11 78 1.88 2532 1.79
2 -32 2 - 11 1132 2.35 14 2.26


 

Komatsu 30° Flare (JIS Metric)

This connection has parallel metric threads with a 30° seat, and is common on Komatsu equipment. While the JIS metric connection and the JIS 300 flare are alike, the latter has BSPP-like thread dimensions.


 
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

 


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