In critical applications, that's not far from correct. The torque wrench monitors torque vs strain. If it goes a bit non-linear, it stops. The test department will sometimes test a sample of screws of the length and diameter in fastening parts, properly lubricated, etc., until they begin to yield. Then they back off the torque a bit during assembly. Another method is to torque them slightly beyond yield as determined from testing. If ever disassembled, the screws should be scrapped. You might find this in cylinder heads, or front suspension parts, etc. For more routine assemblies, it is not so necessary to take such precautions. If it comes down to a claim against the company, they would have computer records of each critical screw installation for their defense. Back in the 80's some bad actors put out counterfeit screws which would fail in a matter of hours after being torqued into assembly. They should still be in prison..
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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