832 form tap drill size9/24/2023 * Values are calculated for Length of engagement of 5xPitch. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.821 - 0.832 20.853 - 21.133 D 2 Pitch Diameter 0.8425 - 0.848 21.4 - 21.539 D Major Diameter 0.8750 (Min) 22.225 (Min) α Varation of 30° anngle (+/-) 1.1667 (Ref) 29.634 (Ref) P Varation of Pitch (+/-) 0.0016 (Ref) 0.041 (Ref) These are commonly used in knife sheath and gun holster making to drill and tap the most common mounting screw size, 8-32. To Tap This Size Screw Or Bolt: Use This Drill Bit: (Closest Fractional:) Decimal Inches. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.8669 - 0.875 22.019 - 22.225 d 2 Pitch Diameter 0.8393 - 0.8425 21.318 - 21.4 d 3 Minor Diameter RECOMMEND TAP DRILL TO USE FOR 75 DEPTH OF THREAD. That is why helpful sizing charts of tap drills are created for that. The drill bit size for 10-32 taps is entirely different because they come in two different thread counts. The fractional drill bit measurement is 5/32. Better through blind cutting forming flood through carbide. The correct drill bit size for 10-32 tap is a 21 drill bit. For calculations of different engagement length use the Thread Calculator hole thread coolant size range grade/ coating material chamfer helix angle dimension. All carbide form taps will be changing to TiCN coating as inventory levels are.
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