* Values are calculated for Length of engagement of 5xPitch. Tap Fractional Drill Bit Number Drill Bit Letter Drill Bit 0-80: 3/64'-1-64-53-2-56-50-3-48-47-4-40: 3/32' 43. in diameter, and for a 10-32 thread, the drill diameter is 0.190 0.032 0.159 in. Tap-drill diameter equals nominal diameter minus thread pitch. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.798 - 0.814 20.269 - 20.676 D 2 Pitch Diameter 0.8286 - 0.835 21.046 - 21.209 D Major Diameter 0.8750 (Min) 22.225 (Min) α Varation of 30° anngle (+/-) 0.9167 (Ref) 23.284 (Ref) P Varation of Pitch (+/-) 0.0018 (Ref) 0.046 (Ref) I quickly calculate proper tap-drill diameters using this simple formula. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.8647 - 0.875 21.963 - 22.225 d 2 Pitch Diameter 0.8249 - 0.8286 20.952 - 21.046 d 3 Minor Diameter Tap Drill Chart Metric Tap Drill Size (Recommended Drill Sizes Suitable for 6H Tolerance) Tap Size Cutting Tap Drill Size Roll Form Tap Drill Size Tap Size Cutting Tap Drill Size Roll Form Tap Drill Size Tap Size Cutting Tap Drill Size M1.6 x 0.35 1.25MM M10 x 1.5 8.5MM 9.20MM M24 x 3 53/64 M1.8 X 0.35 1.45 MM M10 x 1.25 8.75MM U M24 x. For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch.
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