What Size of Hydraulic Quick Connect Couplers Do I Need?

FF12 Flat Face Female Hydraulic Coupler

What size quick connect couplers do I need?

Frequently Asked Questions About Hydraulic Quick Connect Couplers

There are three factors in determining what Hydraulic Quick Connect Couplers are right for you.

  1. Body style
  2. Body size
  3. Thread size.

These three questions below are everything you need to identify the correct hydraulic quick connect couplers you’re looking for. 

Click here to view our hydraulic quick connect coupler identification chart. You can print out this identification chart to match up the the outlines of the male hydraulic couplers. 

 

Graphic showing how to measure body size of FF12-08N

View our Body Size Quick Connect Coupler Chart, to see the dimensions of male flat face, ISO 7241-B, ISO 7241-A, and agricultural style hydraulic couplers.

 

Graphic showing how to measure thread size of FF12-08N

This article will go through the steps of how to identify thread sizes to help you determine the correct size thread you need for your application.

How to Identify Thread Sizes

 
NPT Thread Chart

This article will go through the steps of how to identify thread sizes to help you determine the correct size thread you need for your application.

Measure the diameter of the thread

The first step to identify thread sizes of your components is measuring the diameter. You will need a caliper to do this. If you are measuring the male half of the coupling (external thread) make sure you use the bottom clamps of the caliper, and if you are measuring the female half of the coupling (internal thread) use the top clamps of the caliper to get the right measure.

These measurements will be part of the data you need to match with the information in the selection charts, but keep in mind that your measurement may not give you the exact number appearing on the chart. This can because of manufacturing tolerance or wear, but do not worry, usually the difference is minimal and you just have to choose the closest number from the selection chart.

Popular threads found in the most common fittings

National Pipe Thread (NPT): 

The special characteristic of this style of thread that is going to help you identify it is the presence of an inverted 30° seat in the female half and an 30° internal chamfer in the male half.

Hydraulic Coupler NPT Thread Chart
NPT Thread Chart 
Inch size
Dash size Threads per Inch Male Thread O.D. (in) Female thread I.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

 

SAE Straight Thread O-Ring (ORB)

These are the SAE J1926-1 and ISO 11296-1 styles which also conform to MS16142, UN/UNF threads which are recommended for medium and high pressure hydraulic systems. Here, the characteristics to identify are the presence of an o-ring on the male half and a small chamfer to accept the o-ring on the female half.

Hydraulic Coupler SAE O-Ring Thread Chart
SAE O-Ring Thread Chart
Inch size
Dash size Thread Size Male Thread O.D. (in) Female thread I.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 – 12 116 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

 

JIC 37° Flare or SAE J514

This is a style commonly found in fluid power systems. The special characteristic to identify it is the presence of a 37° flared seat in both the male and female halves.

Hydraulic Coupler JIC Thread Chart
JIC Thread Chart
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread I.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 – 12 116 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 (ORFS) or SAE J1453

The male connector of this style presents an o-ring located in its face. On the other hand, the female half has a machined flat face where the o-ring is compressed to create the seal.

Hydraulic Coupler Flat Face O-Ring Seal Thread Chart
Flat Face O-Ring Seal Thread Chart
Inch size Dash size Thread Size Male Thread O.D. (in) Female thread I.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 – 12 316 1.19 18 1.11
1 -16 716 – 12 716 1.44 34 1.36
14 -20 1116 – 12 1116 1.69 158 1.61
12 -24 2-12 2 2.00 1516 1.92

 

Final considerations

There are other numbers that can be found on the selection charts such as dash numbers and the nominal size. If you already know the style of your fitting and one of this number it is enough to select the one you need quickly and easily. However, as the name itself says, these are only nominal (name) expressions to represent the fitting. If you are not sure, the safest way to proceed is following the steps presented to you in this article.

 

4 thoughts on “What Size of Hydraulic Quick Connect Couplers Do I Need?

    • Steve Sandefur says:

      Hello James,

      We have a wide variety of 1/4″ body quick couplers. You will just need to use this guide to also identify the style, thread type and thread size.

      Regards,

      Steve

    • Steve Sandefur says:

      Hello Terry,

      This guide should help if you need identifying what those leaky couplers are. Please feel free to reach out to us if you have any questions though. We would be happy to help!

      Regards,

      Steve

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