* Values are calculated for Length of engagement of 5xPitch. You can find the tap-drill for any size 60 degree thread, subtract one pitch length from the major diameter. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.132 - 0.138 3.353 - 3.505 d 2 Pitch Diameter 0.1156 - 0.1177 2.936 - 2.99 d 3 Minor Diameter Tap Drill Size Tap Basic Major Diameter - (Pitch ÷ 2) Drill Size Major Diameter - (0.0068 x desired of thread) ÷Threads per Inch Drill Size (mm) Major Diameter - 0. For calculations of different engagement length use the Thread Calculator You can check the minor diameter of an internal thread created with a roll tap and check the amount of material deformation that is formed into the minor. Maximum rounded form minor diameter d 3max d 2max - (0. The rest of the dimensions are tabulated values from the ASME standard. Once you know your wire diameter, you need to find out what is the premissable Measurement for your pitch diameter. It is mostly used when a manufacturer does not have a Go/Nogo gauge for a thread. (UNR Only) 0.0999 (Ref) 2.537 (Ref) α Varation of 30° anngle (+/-) 1.5 (Ref) 38.1 (Ref) P Varation of pitch (+/-) 0.0008 (Ref) 0.02 (Ref) Note-1: Maximum rounded form minor diameter is calculated with following formula. OverWire is a measuring method to obatin the pitch diameter of threads.
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