Gaugeable Tube Fittings and Adapter Fittings 63 Installation Instructions


Swagelok Tube Fittings Up to 1 in./25 mm These instructions apply both to traditional fittings and to fittings with the advanced back-ferrule geometry.


Fully insert the tube into the fitting and against the shoulder; rotate the nut finger-tight. High-pressure applications and high safety-factor systems: Further tighten the nut until the tube will not turn by hand or move axially in the fitting.


1. Preswage the ferrules onto the tube using a Swagelok multihead hydraulic swaging unit (MHSU).


2. Apply the lubricant packaged with the fitting lightly to the body threads and the rear surface of the back ferrule.


Mark the nut at the 6 o’clock position.


While holding the fitting body steady, tighten the nut one and one-quarter turns to the 9 o’clock position.


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


Swagelok Tube Fittings Over 1 in./25 mm


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.


Reassembly—All Sizes You may disassemble and reassemble Swagelok tube fittings many times.


 Always depressurize the system before disassembling a Swagelok tube fitting.


5. While holding the fitting body steady, tighten the nut one-half turn to the 12 o’clock position.


Use the Swagelok MHSU gap inspection gauge to ensure that the fitting has been tightened sufficiently.


Prior to disassembly, mark the tube at the back of the nut; mark a line along the nut and fitting body flats.


Use these marks to ensure that you return the nut to the previously pulled- up position.


Insert the tube with preswaged ferrules into the fitting until the front ferrule seats against the fitting body.


Over 1 in./25 mm sizes: If needed, reapply lubricant lightly to the body threads and the rear surface of the back ferrule.


 Do not use the Swagelok gap inspection gauge with reassembled fittings.


O-Seal Male Connectors 1. Turn the O-seal connector into the female end until it is finger-tight.


2. Tighten the O-seal connector until it makes metal-to-metal contact with the face of the female end.


3. Tighten slightly with a wrench.


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.


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