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Printable tap drill chart
Every common metric, UNC and UNF thread with its tap drill and clearance hole. The one for the wall above the drill press. One sheet, fits A4 and US Letter.
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Metric coarse (ISO) Thread Tap drill mm Clear close Clear normal M1.6×0.35 1.25 1.7 1.8 M2×0.4 1.6 2.2 2.4 M2.5×0.45 2.05 2.7 2.9 M3×0.5 2.5 3.2 3.4 M3.5×0.6 2.9 3.7 3.9 M4×0.7 3.3 4.3 4.5 M5×0.8 4.2 5.3 5.5 M6×1 5 6.4 6.6 M7×1 6 7.4 7.6 M8×1.25 6.8 8.4 9.0 M10×1.5 8.5 10.5 11.0 M12×1.75 10.2 13.0 13.5 M14×2 12 15.0 15.5 M16×2 14 17.0 17.5 M18×2.5 15.5 19.0 20.0 M20×2.5 17.5 21.0 22.0 M22×2.5 19.5 23.0 24.0 M24×3 21 25.0 26.0 M27×3 24 28.0 30.0 M30×3.5 26.5 31.0 33.0
Metric fine Fine thread Tap drill mm Clear close Clear normal M8×1 7 8.4 9.0 M10×1.25 8.8 10.5 11.0 M10×1 9 10.5 11.0 M12×1.5 10.5 13.0 13.5 M12×1.25 10.8 13.0 13.5 M14×1.5 12.5 15.0 15.5 M16×1.5 14.5 17.0 17.5 M18×1.5 16.5 19.0 20.0 M20×1.5 18.5 21.0 22.0 M24×2 22 25.0 26.0
Unified (UNC / UNF) Thread Drill in mm #4-40 UNC #43 0.0890 2.26 #4-48 UNF #42 0.0935 2.37 #6-32 UNC #36 0.1065 2.71 #6-40 UNF #33 0.1130 2.87 #8-32 UNC #29 0.1360 3.45 #8-36 UNF #29 0.1360 3.45 #10-24 UNC #25 0.1495 3.80 #10-32 UNF #21 0.1590 4.04 #12-24 UNC #16 0.1770 4.50 1/4-20 UNC #7 0.2010 5.11 1/4-28 UNF #3 0.2130 5.41 5/16-18 UNC F 0.2570 6.53 5/16-24 UNF I 0.2720 6.91 3/8-16 UNC 5/16″ 0.3125 7.94 3/8-24 UNF Q 0.3320 8.43 7/16-14 UNC U 0.3680 9.35 7/16-20 UNF 25/64″ 0.3906 9.92 1/2-13 UNC 27/64″ 0.4219 10.72 1/2-20 UNF 29/64″ 0.4531 11.51 9/16-12 UNC 31/64″ 0.4844 12.30 9/16-18 UNF 33/64″ 0.5156 13.10 5/8-11 UNC 17/32″ 0.5312 13.49 5/8-18 UNF 37/64″ 0.5781 14.68 3/4-10 UNC 21/32″ 0.6562 16.67 3/4-16 UNF 11/16″ 0.6875 17.46 7/8-9 UNC 49/64″ 0.7656 19.45 7/8-14 UNF 13/16″ 0.8125 20.64 1-8 UNC 7/8″ 0.8750 22.22 1-12 UNF 59/64″ 0.9219 23.42
Related: How tap drill charts work · Tap Drill & Thread Size Calculator
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