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RE: Sheet Metal Screw Properties

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Checking Australian code for screws it only specifies minimum forces, and states materials are not specified. I hazard a guess that the screws are smaller than any tensile test token, and would not give a reliable indicator of the strength of material in the screw. The stress distribution on the threads and between mating part also complex, so have standard tests for the screw.
Also self-cutting-tapping screws also have hardened surfaces to facilitate cutting, so the screws may be brittle. So not a good idea to place the screws in bending.