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  • Users: metalhead88
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  1. metalhead88

    Tapping 0-80 in 17-4PH

    I need to tap 0-80 holes in 40 17-4PH rings. Each ring has 8 holes. It's a thru hole 1/4 deep.The mat. is not yet heat treated. Drilling wasn't a problem. I've tried several taps the best one being an EMUGE tap. I tapped 18 holes before it failed. At more than $40 a pop it's an expense I cannot...

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