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[quote user="ruderunner"]For many metals my understanding is that the fatigue life is well known and easily calculated. Steel is one. [/quote] Fatigue is not a fixed lifespan. The bearable number of load changes depends on the installation situation and the load combination. If the lag screw is tightened correctly their upper part has a press fit in the wood. If the screw loosens this fit can get lost and the bending moments inscrease leading to a shorter fatigue lifespan. Regards, Volker
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