Turn or Torque—Does it Matter? (.PDF Download)

In front of you is an NPTF tapered-thread assembly. The recommendation is to turn, not torque, to tighten the assembly. But all you have is a torque wrench. Or maybe you have an SAE straight-thread port assembly, which has a suggested assembly torque, and your torque wrench is nowhere in sight. The inevitable question pops up: Can’t you just crank that fitting down and be done with it? Tight is tight, right?

Short answer: No. Turn refers to the number

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