Thread: need advice
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Old 07-21-2015, 06:52 AM
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probably the biggest reason to replace studs is not because the studs have reached their service limits, but because the threads in that case, and the threads on that stud, both become worn smoother with each application. this does not weaken either, but instead reduces installation friction, which accounts for as much as or even more than half of the installation torque. so, therein lies the answer to why holes strip out at factory installation torque specs upon reinstallation. because torque specs rely so heavily on an unknown (and, as illustrated here, changing) friction coefficient, they really are a shot in the dark to some extent.

so, if you reuse studs, reduce installation torque. how much? it's anybody's guess.

use new studs, then at least one of two mating surfaces will have a friction coefficient somewhat close to what was assumed when torque values were calculated by the factory.
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