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  1. qcboy

    anyone know black oxide mil-std-171 3.3.4? parts are undercooked!

    I'm the QC tech at a machine shop. We just got some parts back from an outside vendor. Cert says they underwent black oxide per mil-std-171, 3.3.4. HOWEVER, our purchase order (from the owner) requested they not give the parts an acid bath before the black oxide, to preserve the tight...

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