Form tap minor diameter chart9/7/2023 ![]() ![]() There are published charts in our catalogs detailing other sizes and fit. * Values are calculated for Length of engagement of 5xPitch. Some factors need to be considered before proceeding with roll form taps such. ![]() * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.3678 - 0.375 9.342 - 9.525 d 2 Pitch Diameter 0.3452 - 0.3479 8.768 - 8.837 d 3 Minor Diameter ![]() For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch. * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0011 (Ref) 0.028 (Ref) d Major Diameter 0.3667 - 0.3739 9.314 - 9.497 d 2 Pitch Diameter 0.3432 - 0.3468 8.717 - 8.809 d 3 Minor Diameter Tap Chart - UNC/UNF Threads Tap size NF/NC UNF/UNC Threads per inch Basic major dia (inches) Basic effective dia (inches) Basic minor dia of ext. ![]()
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