How much torque is applied to a flare-less fitting?

How much torque is applied to a flare-less fitting?

• A. 1/4 Turn
• B. 1/8 Turn
• C. 1/6 Turn
• D. 1/2 Turn

Answer: (C)

Flareless fittings seal by a precise amount of nut rotation after the nut makes contact with the sleeve. The recommended final tightness is about one-sixth of a turn. This small rotation enough seats and deforms the ferrule to create a reliable seal without over-tightening and risking damage to the tube or seating surfaces. If you turn more, you can over-compress or crush the tube; turn less, and the joint may not seal. So the best practice is to tighten to that one-sixth-turn amount to ensure proper compression and a leak-free connection.

Flareless fittings seal by a precise amount of nut rotation after the nut makes contact with the sleeve. The recommended final tightness is about one-sixth of a turn. This small rotation enough seats and deforms the ferrule to create a reliable seal without over-tightening and risking damage to the tube or seating surfaces. If you turn more, you can over-compress or crush the tube; turn less, and the joint may not seal. So the best practice is to tighten to that one-sixth-turn amount to ensure proper compression and a leak-free connection.