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Bolt torque estimation based on angle and material

Motor Vehicle Maintenance & Repair Asked on August 5, 2021

Is there a valid generic formula to roughly estimate a bolt’s tightening torque similar to the "tighten by hand until seated, tighten XXX degrees more with your wrench"?
I have used for many years the "tighten by hand until seated, then tighten another 180 degrees with wrench" on my gasket-type spark plug when new or "tighten by hand until seated, then tighten another 90 degrees with wrench" on retightening after inspection etc and the truth is that given the spark plug’s position on my dirt bike it would be almost impossible to tighten it with a torque wrench.

So I was wondering if, given the materials included, the thread geometry (eg A2 M10x1.5 or 8.8steel Μ10×1.25 bolt to be screwed on aluminum triple clamp etc) and any washers/stoppers/gaskets included there would be a rough generic way to estimate the applied torque by tightening angle.

One Answer

I mean i guess there is. You cant always trust it though. my rangers caliper bracket bolts were "torqued to spec" but the one still came loose on my twice so i used threadlocker and then torqued to spec. I dont really think theres a generic torque spec. Not every bolt can be turned 180 degrees past tight. I say the best thing is threadlocker and just tighten it a little past tight.

Answered by notbarnobi8585 on August 5, 2021

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