![]() ![]() ![]() * Values are calculated for Length of engagement of 5xPitch. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.9886 - 1 25.11 - 25.4 d 2 Pitch Diameter 0.9419 - 0.9459 23.924 - 24.026 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator In manufactured parts, holes with female screw threads are often needed they accept male screws to facilitate the building and fastening of a finished assembly. * Values are calculated for Length of engagement of 5xPitch. Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter. 75 Thread: Stainless Steel, Steels & Iron. ![]() * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0016 (Ref) 0.041 (Ref) d Major Diameter 0.987 - 0.9984 25.07 - 25.359 d 2 Pitch Diameter 0.939 - 0.9443 23.851 - 23.985 d 3 Minor Diameter Machine Screw Size: Threads Per Inch: Minor Dia: Tap Drills: Clearance Hole Drills: Alum, Brass, & Plasitcs. ![]()
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