UNC (Unified Coarse Thread) Angle of Thread 60 Degrees

 

Actions Size Outside Dia Inch Tpi Pitch Inch Thread Depth Thou Core Dia Male Inch Core Dia Female Inch Hex A/flats Inch Tapping Drill Size Inch Tapping Drill Size mm Letter Or Number
3 - 1/2 3.500 4 0.250 153 3.193 3.229 3.268 83.0 3 - 1/4
3 - 3/4 3.750 4 0.250 153 3.413 3.479 3.504 89.0 3 - 1/2
4 4.000 4 0.250 153 3.693 3.729 3.760 95.5 3 - 3/4