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Roll form tap drill chart11/28/2023 ![]() ![]() ![]() ![]() Thread Calculator and Chart for metric thread, npt thread, bsp thread, unf thread, unc thread, acme thread, bspp thread, un thread, bspt thread, pipe thread, stub acme thread and buttress thread.* Permisable values for thread Class 4g # Description Value (mm) Value (Inch) es Allowance 0.032 (Ref) 0.0013 (Ref) d Major Diameter 15.818 - 15.968 0.6228 - 0.6287 d 2 Pitch Diameter 14.904 - 14.994 0.5868 - 0.5903 R Root Radius 0.188 (Min) 0.0074 (Min) C Root Truncation 0.188 - 0.342 0.0074 - 0.0135 LE Normal Length of Engagement 5.6 - 16 0.2205 - 0.6299 ![]()
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