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Used in industry and agriculture machine.



1. Inspect the hydraulic fitting and mating port to ensure that there is no foreign matter present or nicks in the "O" Ring to cause a leak.

2. Lubricate the "O" Ring with a light coating of oil or hydraulic fluid.

3. On the fittings adjustable thread, back the locknut off as far as possible and screw the fitting into the port until the flat back-up washer makes contact with the face of the port.

4. Align the adjustable fitting with the end of the tube assembly by unscrewing the fitting to the proper direction. (Do not unscrew the fitting more than one full turn.)

5. Using a wrench to hold the fitting in the desired position, tighten the locknut to the proper torque value as shown in the torque chart for adjustable SAE threads.

6. Visually inspect the fitting assembly to confirm that the "O" Ring has seated properly in the female ports angular seating groove and the back-up washer is seated flat against the face of the port. Inspect threads before assembly to be assured that the male thread and female port are free of burrs and other foreign matter. Lubricate the hydraulic "O" Ring before installing the fitting to prevent the "O" Ring from possible damage during installation.


NPTF threads are formed to have a 3/4" taper with tightly machined tolerances to provide contact at the crest and root of the thread as well as the flank. The metal to metal seal of the thread crest, root, and flank, together provide a complete seal to help prevent the possibility of spiral leakage. NPTF threads also provide the holding power for the connection while in high pressure service, which limits the reliability of the seal which the threads are makingwith the female port.

For high pressure applications where constant vibration is running through the hydraulic systems, hydraulic fittings with SAE straight threads which connect to female or male ports are recommended.


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