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  • Users: Dockken
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  1. Dockken

    Countersink dim

    The question is Countersink dim. for a 4-40, 100 deg. c'sink Helical sharp dim. for this screw is .225 print size callout is .231 + - .005 = .226 to .236 is this a aerospace standed the low end seams to close to helical Max dim. of .225 or a case of lazy engineering, just use = + -...

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