Hydraulic Couplers
What Size of Hydraulic Quick Connect Couplers Do I Need?
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.
- Body style
- Body size
- 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.
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.
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
Jun
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.
| Inch size | Dash size | Threads per Inch | Male Thread O.D. (in) | Female thread I.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 |
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.
| Inch size | Dash size | Thread Size | Male Thread O.D. (in) | Female thread I.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 |
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.
| Inch size | Dash size | Thread Size | Male Thread O.D. (in) | Female thread I.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 |
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.
| Inch size | Dash size | Thread Size | Male Thread O.D. (in) | Female thread I.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 | 1 3⁄16 | 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 | 15⁄8 | 1.61 |
| 1 1⁄2 | -24 | 2-12 | 2 | 2.00 | 1 15⁄16 | 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.
I have a Massey Ferguson. GC1700 and I need a 1/4″ male and female quick connector.
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
Looking for replacement for the hydraulic couplers in service, due to leaks.
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
I am looking for the following three qd’s in stainless. I only have the Dixon Number. I will take any equivalent.
1 each
DXN F-ST16F12
DXN 16STF12-LS
DXN 6ST6-LS
pioneer 8250-4xj coupler do i need
I have a hydraulic multiplier. I had a mishap and bent one of the iso/pioneer coupliers. It has threads on one end that screws into the hydraulic box and the other end connects thru quick coulpe to the hose.
Hello, please let us know which kit you have and we can direct you to the right coupler.
Yanmar sa425 rear remote valve cupler by the manual shows 3/8 NPT ISO 7241-B so I ordered 3/8 ISO 7241-A and it is to small os I tried a Dixon fitting #AG3F3-PV that’s 3/8 NPTF this fitting is over sized so I checked the fitting on the valve # HNV38-12SAEFJ-22F0 made by faster. Need help
Hello, please use our new coupler identification video to see how to properly identify your couplers.
https://youtu.be/QQm3Q0BWbfI
Hello , I have a manitou mlt625 telehandler….it has some European fittings and I am needing to change them to work with my skid steer attachments
Hello,
We do not have any info on which fittings come on that machine. You can use our guide to help identify what those may be. You can browse our selection of fittings here:
https://summit-hydraulics.com/product-category/adapters-and-fittings/
Please not we do not carry any metric thread adapter fittings at this time.
what female do I need, mine has no markings on it. The male end has “Pioneer 1/2″ 5080-4 on it”.
Please use our guide to measure what size that coupler should be. You can also watch our video for a visual representation on how to measure.
https://youtu.be/Exjz0_UoDOY