* Values are calculated for Length of engagement of 5xPitch. Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial Drill Size Closest Imperial M1.5 x 0.35 1.5 0.35 1.15 56 1.60 55 1. Inch, Form Taps Metric, Cut Taps Metric, Form Taps This app will give you the suggested Tap Drill Sizes for: NPT (Tapered Pipe Threads) NPS (Straight Pipe Threads) Provided within this app is a full Decimal Equivalent Calculator with results for Number Drills, Letter Drills, Fractional Drills and Metric Drill diameters. * Permisable values for thread Class 2B # Description Value (Inch) Value (mm) D 1 Minor Diameter 0.0849 - 0.0948 2.156 - 2.408 D 2 Pitch Diameter 0.0958 - 0.0991 2.433 - 2.517 D Major Diameter 0.1120 (Min) 2.845 (Min) α Varation of 30° anngle (+/-) 1.75 (Ref) 44.45 (Ref) P Varation of Pitch (+/-) 0.001 (Ref) 0.025 (Ref) Metric Tap Chart Tap Drill Clearance Drill Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit. In our case, the correct tap drill would be the closest to 3.4 mm from below, and that is the 3.3 mm or 0.13-inch tap drill. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.1069 - 0.112 2.715 - 2.845 d 2 Pitch Diameter 0.0939 - 0.0958 2.385 - 2.433 d 3 Minor Diameter A rule of thumb is that the right tap drill is around 85 for coarse threads and 90 for fine threads which feature a higher number of threads per axial distance. For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch. Metric Tap Drill Size Table - Ficient Design Tap Chart Metric Threads - Carbide Depot Grace usa roll pin punch set 8-piece brass knuckles, multi borer drill. (UNR Only) 0.0815 (Ref) 2.07 (Ref) α Varation of 30° anngle (+/-) 1.75 (Ref) 44.45 (Ref) P Varation of pitch (+/-) 0.0007 (Ref) 0.018 (Ref) Tap Dill Size is the drill diameter we should use before a tapping operation. * Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0008 (Ref) 0.02 (Ref) d Major Diameter 0.1061 - 0.1112 2.695 - 2.824 d 2 Pitch Diameter 0.0925 - 0.095 2.35 - 2.413 d 3 Minor Diameter
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