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

- Jan 18, 2019 -

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. 

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. 

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.

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.

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