![]() ![]() ![]() * Values are calculated for Length of engagement of 5xPitch. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.798 - 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) 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. 005' for the drill size for pitches less than 10 TPI take the amount from step 1 and multiply x.05 ( 5 ) and add this to the drill size. * 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 ![]() Major Diameter Minor Diameter Drill Size. For calculations of different engagement length use the Thread Calculator Tap Drill Chart: Tapped Hole Stainless Steel, Steels, Iron Microform Precision. * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0015 (Ref) 0.038 (Ref) d Major Diameter 0.8632 - 0.8735 21.925 - 22.187 d 2 Pitch Diameter 0.8222 - 0.8271 20.884 - 21.008 d 3 Minor Diameter Form taps require a larger drilled hole size prior to tapping than corresponding cutting taps. ![]()
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