Directions for assembly of Tube Nut

When assembling a tube nut and sleeve to tubing there are certain steps that need to be taken to insure that a good seal is achieved. Either a tube fitting body or pre-installation body can be used. The following steps illustrate how this process is completed.

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1.
Cut the pipe square, remove all internal
and external burrs.

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2.
Oil internal threading and cone thoroughly.
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Thoroughly oil both ring and nut (do
not grease).
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Fit both ring and nut onto the pipe.
Be careful not to fit the ring the
wrong way.

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5. Screw on the nut by hand until it touches.

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6. Push the tube against the thrust of internal cone.
A4-TUBENUT-77. Screw on until the pipe cannot turn any more. Draw a mark on the nut to improve the convenience of checking the number of turns to be given.
A4-TUBENUT-88. Give the nut a 3/4 turn, the ring clamps the pipe (the pipe must not rotate).

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9. Final clamping is achieved by tightening the nut 3/4 of a turn. Thus, the ring is sunk into the pipe wall.

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10. Next, loosen the nut and check the upset flange fills the whole cutting face of the ring. Otherwise, tighten a bit more. It does not matter if the ring rotates on the pipe.
A4-TUBENUT-1111. After loosening, the final tightening of the nut should not require excessive pressure.
A4-TUBENUT-12NOTE: The straight portion of the pipe must be 2 times the height “H” of the nut as a minimum.