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Tap Drill Sizes for Forming Taps REFERENCE

TO ESTABLISH TAP DRILL SIZES FOR INCH SIZE ROLL FORMING TAPS TAP DRIIL SIZE = Basic Tap 0.0. — (.0068 x % of Thread Desired) Threads Per Inch 068 x 250 — = .228 Dia. (EXAMPLE 1/4-20 Tap with 65% Thread) = . PRACTICAL FORMULA - METRIC SIZES TO ESTABLISH TAP DRILL SIZES FOR METRIC SIZE ROLL FORMING TAPS TAP DRIIL SIZE …

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