![]() * Values are calculated for Length of engagement of 5xPitch. A smaller Thread height means a larger tap. A larger Thread height means a smaller tap drill size. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.369 - 0.375 9.373 - 9.525 d 2 Pitch Diameter 0.3523 - 0.3547 8.948 - 9.009 d 3 Minor Diameter In tapping, it is customary to express the thread height (Sometimes called thread depth) as the relation in percentage between the actual depth and the maximum depth. For calculations of different engagement length use the Thread Calculator
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