Metric drill size chart (1–20 mm)
Metric drills in 0.5 mm steps plus every metric tap drill size, with inch equivalents and the nearest inch drill. Metric tap drills are about major diameter minus pitch: M6×1 → 5.0 mm, M8×1.25 → 6.8 mm.
| Drill | Inch | mm | Nearest other drills | Tap drill for |
|---|---|---|---|---|
| 1.0 mm | 0.0394 | 1.000 | 3/64" (0.0469) · #61 (0.0390) | — |
| 1.25 mm | 0.0492 | 1.250 | 3/64" (0.0469) · #56 (0.0465) | M1.6x0.35 |
| 1.35 mm | 0.0532 | 1.350 | 3/64" (0.0469) · #55 (0.0520) | M1.6x0.35 (50%) |
| 1.45 mm | 0.0571 | 1.450 | 1/16" (0.0625) · #54 (0.0550) | M1.6x0.35 (form) |
| 1.5 mm | 0.0591 | 1.500 | 1/16" (0.0625) · #53 (0.0595) | — |
| 1.6 mm | 0.0630 | 1.600 | 1/16" (0.0625) · #52 (0.0635) | M2x0.4 |
| 1.75 mm | 0.0689 | 1.750 | 1/16" (0.0625) · #50 (0.0700) | M2x0.4 (50%) |
| 1.8 mm | 0.0709 | 1.800 | 5/64" (0.0781) · #50 (0.0700) | M2x0.4 (form) |
| 2.0 mm | 0.0787 | 2.000 | 5/64" (0.0781) · #47 (0.0785) | — |
| 2.05 mm | 0.0807 | 2.050 | 5/64" (0.0781) · #46 (0.0810) | M2.5x0.45 |
| 2.2 mm | 0.0866 | 2.200 | 3/32" (0.0938) · #44 (0.0860) | M2.5x0.45 (50%) |
| 2.3 mm | 0.0906 | 2.300 | 3/32" (0.0938) · #43 (0.0890) | M2.5x0.45 (form) |
| 2.5 mm | 0.0984 | 2.500 | 3/32" (0.0938) · #40 (0.0980) | M3×0.5 |
| 2.65 mm | 0.1043 | 2.650 | 7/64" (0.1094) · #37 (0.1040) | M3x0.35 |
| 2.7 mm | 0.1063 | 2.700 | 7/64" (0.1094) · #36 (0.1065) | M3×0.5 (50%) |
| 2.75 mm | 0.1083 | 2.750 | 7/64" (0.1094) · #35 (0.1100) | M3x0.35 (50%) |
| 2.8 mm | 0.1102 | 2.800 | 7/64" (0.1094) · #35 (0.1100) | M3×0.5 (form) |
| 2.85 mm | 0.1122 | 2.850 | 7/64" (0.1094) · #33 (0.1130) | M3x0.35 (form) |
| 2.9 mm | 0.1142 | 2.900 | 7/64" (0.1094) · #33 (0.1130) | M3.5x0.6 |
| 3.0 mm | 0.1181 | 3.000 | 1/8" (0.1250) · #31 (0.1200) | — |
| 3.1 mm | 0.1221 | 3.100 | 1/8" (0.1250) · #31 (0.1200) | M3.5x0.6 (50%) |
| 3.2 mm | 0.1260 | 3.200 | 1/8" (0.1250) · #30 (0.1285) | M3.5x0.6 (form) |
| 3.3 mm | 0.1299 | 3.300 | 1/8" (0.1250) · #30 (0.1285) | M4×0.7 |
| 3.5 mm | 0.1378 | 3.500 | 9/64" (0.1406) · #29 (0.1360) | M4x0.5, M4×0.7 (50%) |
| 3.7 mm | 0.1457 | 3.700 | 9/64" (0.1406) · #26 (0.1470) | M4×0.7 (form), M4x0.5 (50%) |
| 3.8 mm | 0.1496 | 3.800 | 5/32" (0.1563) · #25 (0.1495) | M4x0.5 (form) |
| 4.0 mm | 0.1575 | 4.000 | 5/32" (0.1563) · #22 (0.1570) | — |
| 4.2 mm | 0.1653 | 4.200 | 11/64" (0.1719) · #19 (0.1660) | M5×0.8 |
| 4.5 mm | 0.1772 | 4.500 | 11/64" (0.1719) · #16 (0.1770) | M5x0.5, M5×0.8 (50%) |
| 4.7 mm | 0.1850 | 4.700 | 3/16" (0.1875) · #13 (0.1850) | M5x0.5 (50%) |
| 4.8 mm | 0.1890 | 4.800 | 3/16" (0.1875) · #12 (0.1890) | M5x0.5 (form) |
| 5.0 mm | 0.1968 | 5.000 | 13/64" (0.2031) · #9 (0.1960) | M6×1.0 |
| 5.4 mm | 0.2126 | 5.400 | 7/32" (0.2188) · #3 (0.2130) | M6×1.0 (50%) |
| 5.5 mm | 0.2165 | 5.500 | 7/32" (0.2188) · #3 (0.2130) | M6x0.75 (50%) |
| 5.7 mm | 0.2244 | 5.700 | 7/32" (0.2188) · #2 (0.2210) | M6x0.75 (form) |
| 6.0 mm | 0.2362 | 6.000 | 15/64" (0.2344) · Letter B (0.2380) | M7x1 |
| 6.4 mm | 0.2520 | 6.400 | 1/4" (0.2500) · Letter E (0.2500) | M7x1 (50%) |
| 6.5 mm | 0.2559 | 6.500 | 1/4" (0.2500) · Letter F (0.2570) | — |
| 6.6 mm | 0.2598 | 6.600 | 17/64" (0.2656) · Letter G (0.2610) | M7x1 (form) |
| 6.8 mm | 0.2677 | 6.800 | 17/64" (0.2656) · Letter H (0.2660) | M8×1.25 |
| 7.0 mm | 0.2756 | 7.000 | 9/32" (0.2813) · Letter J (0.2770) | M8x1 |
| 7.2 mm | 0.2835 | 7.200 | 9/32" (0.2813) · Letter K (0.2810) | M8×1.25 (50%) |
| 7.4 mm | 0.2913 | 7.400 | 19/64" (0.2969) · Letter L (0.2900) | M8x1 (50%) |
| 7.5 mm | 0.2953 | 7.500 | 19/64" (0.2969) · Letter M (0.2950) | — |
| 7.6 mm | 0.2992 | 7.600 | 19/64" (0.2969) · Letter N (0.3020) | M8x1 (form) |
| 8.0 mm | 0.3150 | 8.000 | 5/16" (0.3125) · Letter O (0.3160) | — |
| 8.5 mm | 0.3347 | 8.500 | 21/64" (0.3281) · Letter Q (0.3320) | M10×1.5 |
| 8.8 mm | 0.3465 | 8.800 | 11/32" (0.3438) · Letter S (0.3480) | M10x1.25 |
| 9.0 mm | 0.3543 | 9.000 | 23/64" (0.3594) · Letter T (0.3580) | M10x1, M10×1.5 (50%) |
| 9.2 mm | 0.3622 | 9.200 | 23/64" (0.3594) · Letter T (0.3580) | M10x1.25 (50%) |
| 9.4 mm | 0.3701 | 9.400 | 3/8" (0.3750) · Letter U (0.3680) | M10x1.25 (form), M10x1 (50%) |
| 9.5 mm | 0.3740 | 9.500 | 3/8" (0.3750) · Letter V (0.3770) | — |
| 9.6 mm | 0.3780 | 9.600 | 3/8" (0.3750) · Letter V (0.3770) | M10x1 (form) |
| 10.0 mm | 0.3937 | 10.000 | 25/64" (0.3906) · Letter X (0.3970) | — |
| 10.2 mm | 0.4016 | 10.200 | 13/32" (0.4063) · Letter Y (0.4040) | M12×1.75 |
| 10.5 mm | 0.4134 | 10.500 | 13/32" (0.4063) · Letter Z (0.4130) | M12x1.5 |
| 10.8 mm | 0.4252 | 10.800 | 27/64" (0.4219) · Letter Z (0.4130) | M12x1.25 |
| 10.9 mm | 0.4291 | 10.900 | 27/64" (0.4219) · Letter Z (0.4130) | M12×1.75 (50%) |
| 11.0 mm | 0.4331 | 11.000 | 7/16" (0.4375) · Letter Z (0.4130) | M12x1.5 (50%) |
| 11.2 mm | 0.4409 | 11.200 | 7/16" (0.4375) · Letter Z (0.4130) | M12x1.25 (50%) |
| 11.3 mm | 0.4449 | 11.300 | 7/16" (0.4375) · Letter Z (0.4130) | M12x1.5 (form) |
| 11.4 mm | 0.4488 | 11.400 | 29/64" (0.4531) · Letter Z (0.4130) | M12x1.25 (form) |
| 11.5 mm | 0.4528 | 11.500 | 29/64" (0.4531) · Letter Z (0.4130) | — |
| 12.0 mm | 0.4724 | 12.000 | 15/32" (0.4688) · Letter Z (0.4130) | M14×2.0 |
| 12.5 mm | 0.4921 | 12.500 | 31/64" (0.4844) · Letter Z (0.4130) | M14x1.5 |
| 12.7 mm | 0.5000 | 12.700 | 1/2" (0.5000) · Letter Z (0.4130) | M14×2.0 (50%) |
| 13.0 mm | 0.5118 | 13.000 | 33/64" (0.5156) · Letter Z (0.4130) | M14x1.5 (50%) |
| 13.1 mm | 0.5158 | 13.100 | 33/64" (0.5156) · Letter Z (0.4130) | M14×2.0 (form) |
| 13.3 mm | 0.5236 | 13.300 | 17/32" (0.5313) · Letter Z (0.4130) | M14x1.5 (form) |
| 13.5 mm | 0.5315 | 13.500 | 17/32" (0.5313) · Letter Z (0.4130) | — |
| 14.0 mm | 0.5512 | 14.000 | 35/64" (0.5469) · Letter Z (0.4130) | M16×2.0 |
| 14.5 mm | 0.5709 | 14.500 | 37/64" (0.5781) · Letter Z (0.4130) | M16x1.5 |
| 14.75 mm | 0.5807 | 14.750 | 37/64" (0.5781) · Letter Z (0.4130) | M16×2.0 (50%) |
| 15.0 mm | 0.5906 | 15.000 | 19/32" (0.5938) · Letter Z (0.4130) | M16x1.5 (50%) |
| 15.25 mm | 0.6004 | 15.250 | 19/32" (0.5938) · Letter Z (0.4130) | M16x1.5 (form) |
| 15.5 mm | 0.6102 | 15.500 | 39/64" (0.6094) · Letter Z (0.4130) | M18x2.5 |
| 16.0 mm | 0.6299 | 16.000 | 5/8" (0.6250) · Letter Z (0.4130) | — |
| 16.5 mm | 0.6496 | 16.500 | 21/32" (0.6563) · Letter Z (0.4130) | M18x1.5, M18x2.5 (50%) |
| 17.0 mm | 0.6693 | 17.000 | 43/64" (0.6719) · Letter Z (0.4130) | M18x2.5 (form), M18x1.5 (50%) |
| 17.25 mm | 0.6791 | 17.250 | 43/64" (0.6719) · Letter Z (0.4130) | M18x1.5 (form) |
| 17.5 mm | 0.6890 | 17.500 | 11/16" (0.6875) · Letter Z (0.4130) | M20×2.5 |
| 18.0 mm | 0.7087 | 18.000 | 45/64" (0.7031) · Letter Z (0.4130) | M20x2 |
| 18.5 mm | 0.7284 | 18.500 | 47/64" (0.7344) · Letter Z (0.4130) | M20x1.5, M20×2.5 (50%) |
| 18.75 mm | 0.7382 | 18.750 | 47/64" (0.7344) · Letter Z (0.4130) | M20x2 (50%) |
| 19.0 mm | 0.7480 | 19.000 | 3/4" (0.7500) · Letter Z (0.4130) | M20x2 (form), M20x1.5 (50%) |
| 19.25 mm | 0.7579 | 19.250 | 49/64" (0.7656) · Letter Z (0.4130) | M20x1.5 (form) |
| 19.5 mm | 0.7677 | 19.500 | 49/64" (0.7656) · Letter Z (0.4130) | M22x2.5 |
| 20.0 mm | 0.7874 | 20.000 | 25/32" (0.7813) · Letter Z (0.4130) | — |
Common questions
- What is 6.8 mm in inches?
- 0.2677 in, the M8×1.25 tap drill; the nearest inch drill is a letter H (0.266 in).
- What metric drill replaces a #7?
- 5.1 mm (0.2008 in) is the closest to a #7 (0.201 in).
Calculators that use this data
Drill Chart & Size FinderNearest-drill finder over the full drill chart (#97-#1, A-Z, 1/64-4 in, 0.1-60 mm), drill speeds and pecks, Silver & Deming, aircraft and center drills, counterbores and reamer pre-drills.Tap Drill & Thread % CalculatorPercent of thread for any drill (cut and form taps), 75 / 65 / 50% tap drills, UNC / UNF / metric chart with thread limits, every thread to 4 in and M64, pipe taps and STI / Helicoil.Drilling CalculationsDrilling RPM, feed per revolution, point allowance and cutting time.
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