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called yield tightening
Posted by Stephen Goldberger (more from Stephen Goldberger) on Wed, 25 Jul 2012 05:32:43
In Reply to: Why extra 30 deg turn on caliper retaining bolts?, PeterH, Tue, 24 Jul 2012 15:00:30
Since you asked "why", not just "will it hold" - Just plain torquing bolts does not give a predictable amount of hold from the bolts, as the amount of rust or dirt or lubrication in the threads will affect the relationship between torque and clamping force. For ultra-critical camping (like the head bolts on a nuclear reactor) they use studs and stretch them with a machine, then snug down the nuts. THat "extra turn" is usually designed to stretch the bolt to the yield point without stretching it to the point of failure. In the case of a brake caliper hold down, that's a little over the top. Either loctite (as specified here) or "safety wires" or a turned up tab on a shim (like the 99 or early C900) combined with "good and tight" is enough. And 155 ft. lb. is definitely "good and tight" for those modest sized bolts.

posted by 24.165.160...
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