Non-Adjustable Parallel Thread Port End Assembly Instructions for Hydraulic Fittings

Non-adjustable parallel thread port end assembly instructions for hydraulic fittings from Parker Hannifin.

No matter what type of port or tube ends your fittings have, it's important to know and use the proper assembly and installation steps. Today we are talking about proper assembly of non-adjustable parallel thread port ends, which include SAE straight threads (SAE J1926 / ISO 11926), ISO 6149, JIS B2351, BSPP flat face (ISO 1179), and DIN metric flat face (ISO 9974). Unlike tapered threads, parallel thread ports do not require sealing by the threads. The seal is obtained by other means, typically an elastomeric seal. When assembled properly, parallel thread ports provide the best leak-free port connection available. Therefore, proper fitting assembly and installation is key to ensuring leak-free parallel thread port connections in your system. 

Watch the video to learn the proper process for assembly and installation of non-adjustable parallel thread port ends, or follow the steps outlined below. 


Proper non-adjustable parallel thread port assembly and installation steps:

Step 1: Inspect the threads.
Start by inspecting the thread and sealing surfaces. They must be free of burrs, nicks, scratches, and any foreign material. You will not be able to achieve a proper seal if any of these are present. Also, if your fitting has a male port end that requires an o-ring, seal, washer, or retaining ring with o-ring make sure that there is one properly installed before moving to the next step. 

Step 2: Lubricate the o-ring (if it applies). 
For male port ends with o-rings, you will need to lubricate the o-ring using a light coat of system fluid or a compatible lubricant. This will allow the o-ring to smoothly transition into the port. 

Step 3: Finger tight. 
Screw the connector into the port until finger tight. 

Step 4: Tighten to proper torque.
Use the torque values shown in the Assembly and Installation section of the Parker Catalog 4300

Step 5: For port ends with o-rings or seals present, Inspect the assembly.
Make sure to check the finished assembly to assure that the o-ring is not visible and that the fitting is fully seated on the flat surface of the port.

By following these steps your non-adjustable parallel thread port end connections should be leak-free. To help you ensure that all of your hydraulic fitting connections are installed leak-free, Parker Tube Fittings Division has created a series of tube and port end assembly and installation videos for the most common hydraulic fitting connections, which will be shared on over the next couple of months. You can also find detailed assembly and installation information for port end threads and tube fittings in the Assembly/Installation section of our Catalog 4300

Refer to our Tube Fittings Division Frequently Asked Questions page,, for a wealth of information and resources. 

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Burleigh Bailey Engineer at Parker Tube Fittings Division

Contributed by Burleigh Bailey, senior product engineer at Parker Tube Fittings Division




Additional related content about hydraulic tube, hose, and port fitting connections:

Tapered Thread Port Assembly Instructions for Hydraulic Fittings 
Turn vs. Torque? How Making the Right Choice Keeps Your Hydraulic Fitting Connections Leak-Free
How Many Times Can I Reassemble a Hydraulic Fitting?
Tube End Preparation Best Practices for Leak-Free Hydraulic Tube Fitting Connections


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Comments for Non-Adjustable Parallel Thread Port End Assembly Instructions for Hydraulic Fittings

Rick Brown
Another great video!

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