Tool porn

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hugo7

What I'm confused about is that when you torque a bolt up, aren't you only engaging the last relevant ¼ - 2 threads?

At that point how do you ascertain friction vs torque?

Is it by feeling the friction involved in tightening up to that point?

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Grumpy_Git in reply to @hugo7

Threads are cut so that all "surfaces" should be in contact.

I've at least picked this up from the mechanical engineers at work.

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gbj_tester in reply to @Grumpy_Git

should be

Yes, should be, if everything is perfect. Nothing is perfect, and commodity fasteners are a really long way from it.
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gbj_tester in reply to @Grumpy_Git

Threads are cut

Also, threads on commodity fasteners are not usually cut, they're rolled. This is a good thing for several reasons, but not for precision.

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