![]() No responsibility from Kennametal is assumed. * Values are calculated for Length of engagement of 5xPitch. Tap Drill Size Kennametal Tap Drill Size Calculator These calculations are based upon theoretical values and are only intended for planning purposes. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.517 - 0.527 13.132 - 13.386 D 2 Pitch Diameter 0.5349 - 0.5397 13.586 - 13.708 D Major Diameter 0.5620 (Min) 14.275 (Min) α Varation of 30° anngle (+/-) 1.25 (Ref) 31.75 (Ref) P Varation of Pitch (+/-) 0.0014 (Ref) 0.036 (Ref) Since the starting point is basic pitch diameter, dividing the limit number by 2 establishes in thousands of an inch the amount of maximum tap pitch diameter is above the basic in the H series and the amount the minimum tap pitch diameters under basic in the L series. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.5548 - 0.562 14.092 - 14.275 d 2 Pitch Diameter 0.5321 - 0.5349 13.515 - 13.586 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator ![]() To get the tap drill size in other depths, use our Tap Drill Size Calculator. You can learn more about thread depth in tapping here. * Values are calculated for Length of engagement of 5xPitch. If not specified, assume a thread depth of 75. For example, the tap drill for 3/8-16 is 5/16. ![]() * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0011 (Ref) 0.028 (Ref) d Major Diameter 0.5537 - 0.5609 14.064 - 14.247 d 2 Pitch Diameter 0.5301 - 0.5338 13.465 - 13.559 d 3 Minor Diameter Diameter of thread minus the pitch equals the tap drill size. ![]()
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