How to Correctly Install Tube Fittings

The installation of tube fittings provides higher sealing and vibration resistance through a double ferrules design, making it an ideal choice for high-pressure and dynamic systems. They are commonly used in situations requiring higher sealing and stability in pipeline connections, such as in hydraulic and pneumatic systems. Proper installation and maintenance can significantly improve the reliability and safety of the pipeline system.

Installation Instructions

Fully insert the tube into the fitting and against the shoulder, rotate the nut finger-tight.

Mark the nut at the 6 o’clock position.

1/16", 1/8", and 3/16", 2, 3, and 4 mm tube fittings, tighten the nut only three-quarters turn to the 3 o’clock position.

1/4"– 1", and 6 mm – 25 mm tube fittings, tighten the nut one and one-quarters turn to the 9 o’clock position.

1. Preswage the ferrules onto the tube using the Multihead Hydraulic Swaging Unit (MHSU).
2. Apply the lubricant lightly to the body threads and the rear surface of the back ferrule.
3. Insert the tube with preswaged ferrules into the fitting until the front ferrule seats against the fitting body; rotate the nut finger-tight.
4. Mark the nut at the 6 o'clock position.
5. While holding the fitting body steady, tighten the nut one-half turn to the 12 o'clock position.

Reassembly-All Sizes

1. You may disassemble and reassemble tube fittings many times.Always depressurize the system before disassembling.
2. Prior to disassembly, mark a line long the nut and fitting body flats.Use the marks to ensure that you return the nut to the previously pulled-up position.
3. Insert the tube with preswaged ferrules into the fitting until the front ferrule seats against the fitting body.
4. While holding the fitting body steady, rotate the nut with a wrench to the previously pulled-up position, as indicated by the marks on the tube and flats. At this point, you will feel a significant increase in resistance. Tighten the nut slightly.