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  • Users: stfgrizz
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  1. stfgrizz

    Tap drill depths for taper reamed NPTF threads

    I have some standard minimum tap drill depths I use for up to 1 1/4 NPTF taper reamed internal threads. I'm looking for standard minimum tap drill depths for the larger sizes up to 3" and I can only find an old chart in my files for NPT threads and it is largly illegible. Thanks in advance.

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