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  1. 2muchcoffee

    Material specification vs. material grade - how do they relate?

    We are a spring manufacturer. We made springs to a customer’s drawing but they are rejecting them. Their complaint is that we used the wrong material. Their drawing calls out “Music wire per QQ-W-470, spring temper, UNS G-10800, .0220 ± .0004 dia.” We ordered - and used - music wire per...

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