You can't blame engineers for using breaking load as a criterion for selecting chain. Breaking load was one of the earliest chain standards, so engineers got used to specifying it that way and many of them still do. The task now is to instil an understanding among specifiers that breaking load is no guide to chain performance, and that chain strength is not the best measure of chain life. In fact, high tensile strength can actually lead to a shortened working life if component strength has been achieved by making parts hard but brittle.
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