---
type: "drill-series"
series: "metric"
name: "Metric Drill Sizes"
size_count: 227
smallest: "0.2 mm"
largest: "25 mm"
range_in: "0.0079–0.9843"
range_mm: "0.200–25.000"
standard: "ANSI/ASME B94.11M; BS 328"
verified: "August 1, 2026"
url: https://shopmath.org/drills/metric
---

# Metric Drill Sizes — All 227 Sizes in Inches and Millimetres

The metric drill sizes series runs from 0.2 mm at 0.0079 in (0.200 mm) to 25 mm at 0.9843 in (25.000 mm), 227 sizes in all. Metric twist drills, 0.2 mm to 25 mm on the BS 328 increment pattern.

- **Series**: Metric Drill Sizes
- **Sizes**: 227
- **Smallest**: 0.2 mm — 0.0079 in
- **Largest**: 25 mm — 0.9843 in
- **Standard**: ANSI/ASME B94.11M; BS 328

## Every Metric Drill Size

Each size links to its page with the nearest equivalent in the other three series and the threads it taps.

| Drill | Diameter (in) | Diameter (mm) | Fraction | Taps |
| --- | --- | --- | --- | --- |
| [0.2 mm](https://shopmath.org/drills/metric/0-2mm.md) | 0.0079 | 0.200 |  |  |
| [0.22 mm](https://shopmath.org/drills/metric/0-22mm.md) | 0.0087 | 0.220 |  |  |
| [0.25 mm](https://shopmath.org/drills/metric/0-25mm.md) | 0.0098 | 0.250 |  |  |
| [0.28 mm](https://shopmath.org/drills/metric/0-28mm.md) | 0.0110 | 0.280 |  |  |
| [0.3 mm](https://shopmath.org/drills/metric/0-3mm.md) | 0.0118 | 0.300 |  |  |
| [0.32 mm](https://shopmath.org/drills/metric/0-32mm.md) | 0.0126 | 0.320 |  |  |
| [0.35 mm](https://shopmath.org/drills/metric/0-35mm.md) | 0.0138 | 0.350 |  |  |
| [0.38 mm](https://shopmath.org/drills/metric/0-38mm.md) | 0.0150 | 0.380 |  |  |
| [0.4 mm](https://shopmath.org/drills/metric/0-4mm.md) | 0.0157 | 0.400 |  |  |
| [0.42 mm](https://shopmath.org/drills/metric/0-42mm.md) | 0.0165 | 0.420 |  |  |
| [0.45 mm](https://shopmath.org/drills/metric/0-45mm.md) | 0.0177 | 0.450 |  |  |
| [0.48 mm](https://shopmath.org/drills/metric/0-48mm.md) | 0.0189 | 0.480 |  |  |
| [0.5 mm](https://shopmath.org/drills/metric/0-5mm.md) | 0.0197 | 0.500 |  |  |
| [0.52 mm](https://shopmath.org/drills/metric/0-52mm.md) | 0.0205 | 0.520 |  |  |
| [0.55 mm](https://shopmath.org/drills/metric/0-55mm.md) | 0.0217 | 0.550 |  |  |
| [0.58 mm](https://shopmath.org/drills/metric/0-58mm.md) | 0.0228 | 0.580 |  |  |
| [0.6 mm](https://shopmath.org/drills/metric/0-6mm.md) | 0.0236 | 0.600 |  |  |
| [0.62 mm](https://shopmath.org/drills/metric/0-62mm.md) | 0.0244 | 0.620 |  |  |
| [0.65 mm](https://shopmath.org/drills/metric/0-65mm.md) | 0.0256 | 0.650 |  |  |
| [0.68 mm](https://shopmath.org/drills/metric/0-68mm.md) | 0.0268 | 0.680 |  |  |
| [0.7 mm](https://shopmath.org/drills/metric/0-7mm.md) | 0.0276 | 0.700 |  |  |
| [0.72 mm](https://shopmath.org/drills/metric/0-72mm.md) | 0.0283 | 0.720 |  |  |
| [0.75 mm](https://shopmath.org/drills/metric/0-75mm.md) | 0.0295 | 0.750 |  |  |
| [0.78 mm](https://shopmath.org/drills/metric/0-78mm.md) | 0.0307 | 0.780 |  |  |
| [0.8 mm](https://shopmath.org/drills/metric/0-8mm.md) | 0.0315 | 0.800 |  |  |
| [0.82 mm](https://shopmath.org/drills/metric/0-82mm.md) | 0.0323 | 0.820 |  |  |
| [0.85 mm](https://shopmath.org/drills/metric/0-85mm.md) | 0.0335 | 0.850 |  |  |
| [0.88 mm](https://shopmath.org/drills/metric/0-88mm.md) | 0.0346 | 0.880 |  |  |
| [0.9 mm](https://shopmath.org/drills/metric/0-9mm.md) | 0.0354 | 0.900 |  |  |
| [0.92 mm](https://shopmath.org/drills/metric/0-92mm.md) | 0.0362 | 0.920 |  |  |
| [0.95 mm](https://shopmath.org/drills/metric/0-95mm.md) | 0.0374 | 0.950 |  |  |
| [0.98 mm](https://shopmath.org/drills/metric/0-98mm.md) | 0.0386 | 0.980 |  |  |
| [1 mm](https://shopmath.org/drills/metric/1mm.md) | 0.0394 | 1.000 |  |  |
| [1.05 mm](https://shopmath.org/drills/metric/1-05mm.md) | 0.0413 | 1.050 |  |  |
| [1.1 mm](https://shopmath.org/drills/metric/1-1mm.md) | 0.0433 | 1.100 |  |  |
| [1.15 mm](https://shopmath.org/drills/metric/1-15mm.md) | 0.0453 | 1.150 |  |  |
| [1.2 mm](https://shopmath.org/drills/metric/1-2mm.md) | 0.0472 | 1.200 |  |  |
| [1.25 mm](https://shopmath.org/drills/metric/1-25mm.md) | 0.0492 | 1.250 |  | M1.6×0.35 |
| [1.3 mm](https://shopmath.org/drills/metric/1-3mm.md) | 0.0512 | 1.300 |  |  |
| [1.35 mm](https://shopmath.org/drills/metric/1-35mm.md) | 0.0532 | 1.350 |  |  |
| [1.4 mm](https://shopmath.org/drills/metric/1-4mm.md) | 0.0551 | 1.400 |  | M1.6×0.2 |
| [1.45 mm](https://shopmath.org/drills/metric/1-45mm.md) | 0.0571 | 1.450 |  | M1.8×0.35 |
| [1.5 mm](https://shopmath.org/drills/metric/1-5mm.md) | 0.0591 | 1.500 |  |  |
| [1.55 mm](https://shopmath.org/drills/metric/1-55mm.md) | 0.0610 | 1.550 |  |  |
| [1.6 mm](https://shopmath.org/drills/metric/1-6mm.md) | 0.0630 | 1.600 |  | M1.8×0.2, M2×0.4 |
| [1.65 mm](https://shopmath.org/drills/metric/1-65mm.md) | 0.0650 | 1.650 |  |  |
| [1.7 mm](https://shopmath.org/drills/metric/1-7mm.md) | 0.0669 | 1.700 |  |  |
| [1.75 mm](https://shopmath.org/drills/metric/1-75mm.md) | 0.0689 | 1.750 |  | M2×0.25 |
| [1.8 mm](https://shopmath.org/drills/metric/1-8mm.md) | 0.0709 | 1.800 |  |  |
| [1.85 mm](https://shopmath.org/drills/metric/1-85mm.md) | 0.0728 | 1.850 |  |  |
| [1.9 mm](https://shopmath.org/drills/metric/1-9mm.md) | 0.0748 | 1.900 |  |  |
| [1.95 mm](https://shopmath.org/drills/metric/1-95mm.md) | 0.0768 | 1.950 |  |  |
| [2 mm](https://shopmath.org/drills/metric/2mm.md) | 0.0787 | 2.000 |  |  |
| [2.05 mm](https://shopmath.org/drills/metric/2-05mm.md) | 0.0807 | 2.050 |  | M2.5×0.45 |
| [2.1 mm](https://shopmath.org/drills/metric/2-1mm.md) | 0.0827 | 2.100 |  |  |
| [2.15 mm](https://shopmath.org/drills/metric/2-15mm.md) | 0.0846 | 2.150 |  | M2.5×0.35 |
| [2.2 mm](https://shopmath.org/drills/metric/2-2mm.md) | 0.0866 | 2.200 |  |  |
| [2.25 mm](https://shopmath.org/drills/metric/2-25mm.md) | 0.0886 | 2.250 |  |  |
| [2.3 mm](https://shopmath.org/drills/metric/2-3mm.md) | 0.0906 | 2.300 |  |  |
| [2.35 mm](https://shopmath.org/drills/metric/2-35mm.md) | 0.0925 | 2.350 |  |  |
| [2.4 mm](https://shopmath.org/drills/metric/2-4mm.md) | 0.0945 | 2.400 |  |  |
| [2.45 mm](https://shopmath.org/drills/metric/2-45mm.md) | 0.0965 | 2.450 |  |  |
| [2.5 mm](https://shopmath.org/drills/metric/2-5mm.md) | 0.0984 | 2.500 |  | M3×0.5 |
| [2.55 mm](https://shopmath.org/drills/metric/2-55mm.md) | 0.1004 | 2.550 |  |  |
| [2.6 mm](https://shopmath.org/drills/metric/2-6mm.md) | 0.1024 | 2.600 |  |  |
| [2.65 mm](https://shopmath.org/drills/metric/2-65mm.md) | 0.1043 | 2.650 |  | M3×0.35 |
| [2.7 mm](https://shopmath.org/drills/metric/2-7mm.md) | 0.1063 | 2.700 |  |  |
| [2.75 mm](https://shopmath.org/drills/metric/2-75mm.md) | 0.1083 | 2.750 |  |  |
| [2.8 mm](https://shopmath.org/drills/metric/2-8mm.md) | 0.1102 | 2.800 |  |  |
| [2.85 mm](https://shopmath.org/drills/metric/2-85mm.md) | 0.1122 | 2.850 |  |  |
| [2.9 mm](https://shopmath.org/drills/metric/2-9mm.md) | 0.1142 | 2.900 |  | M3.5×0.6 |
| [2.95 mm](https://shopmath.org/drills/metric/2-95mm.md) | 0.1161 | 2.950 |  |  |
| [3 mm](https://shopmath.org/drills/metric/3mm.md) | 0.1181 | 3.000 |  |  |
| [3.1 mm](https://shopmath.org/drills/metric/3-1mm.md) | 0.1220 | 3.100 |  |  |
| [3.2 mm](https://shopmath.org/drills/metric/3-2mm.md) | 0.1260 | 3.200 |  | M3.5×0.35 |
| [3.3 mm](https://shopmath.org/drills/metric/3-3mm.md) | 0.1299 | 3.300 |  | M4×0.7 |
| [3.4 mm](https://shopmath.org/drills/metric/3-4mm.md) | 0.1339 | 3.400 |  |  |
| [3.5 mm](https://shopmath.org/drills/metric/3-5mm.md) | 0.1378 | 3.500 |  | M4×0.5 |
| [3.6 mm](https://shopmath.org/drills/metric/3-6mm.md) | 0.1417 | 3.600 |  |  |
| [3.7 mm](https://shopmath.org/drills/metric/3-7mm.md) | 0.1457 | 3.700 |  |  |
| [3.8 mm](https://shopmath.org/drills/metric/3-8mm.md) | 0.1496 | 3.800 |  |  |
| [3.9 mm](https://shopmath.org/drills/metric/3-9mm.md) | 0.1535 | 3.900 |  |  |
| [4 mm](https://shopmath.org/drills/metric/4mm.md) | 0.1575 | 4.000 |  |  |
| [4.1 mm](https://shopmath.org/drills/metric/4-1mm.md) | 0.1614 | 4.100 |  |  |
| [4.2 mm](https://shopmath.org/drills/metric/4-2mm.md) | 0.1654 | 4.200 |  | M5×0.8 |
| [4.3 mm](https://shopmath.org/drills/metric/4-3mm.md) | 0.1693 | 4.300 |  |  |
| [4.4 mm](https://shopmath.org/drills/metric/4-4mm.md) | 0.1732 | 4.400 |  |  |
| [4.5 mm](https://shopmath.org/drills/metric/4-5mm.md) | 0.1772 | 4.500 |  | M5×0.5 |
| [4.6 mm](https://shopmath.org/drills/metric/4-6mm.md) | 0.1811 | 4.600 |  |  |
| [4.7 mm](https://shopmath.org/drills/metric/4-7mm.md) | 0.1850 | 4.700 |  |  |
| [4.8 mm](https://shopmath.org/drills/metric/4-8mm.md) | 0.1890 | 4.800 |  |  |
| [4.9 mm](https://shopmath.org/drills/metric/4-9mm.md) | 0.1929 | 4.900 |  |  |
| [5 mm](https://shopmath.org/drills/metric/5mm.md) | 0.1968 | 5.000 |  | M6×1 |
| [5.1 mm](https://shopmath.org/drills/metric/5-1mm.md) | 0.2008 | 5.100 |  |  |
| [5.2 mm](https://shopmath.org/drills/metric/5-2mm.md) | 0.2047 | 5.200 |  |  |
| [5.3 mm](https://shopmath.org/drills/metric/5-3mm.md) | 0.2087 | 5.300 |  | M6×0.75 |
| [5.4 mm](https://shopmath.org/drills/metric/5-4mm.md) | 0.2126 | 5.400 |  |  |
| [5.5 mm](https://shopmath.org/drills/metric/5-5mm.md) | 0.2165 | 5.500 |  |  |
| [5.6 mm](https://shopmath.org/drills/metric/5-6mm.md) | 0.2205 | 5.600 |  |  |
| [5.7 mm](https://shopmath.org/drills/metric/5-7mm.md) | 0.2244 | 5.700 |  |  |
| [5.8 mm](https://shopmath.org/drills/metric/5-8mm.md) | 0.2283 | 5.800 |  |  |
| [5.9 mm](https://shopmath.org/drills/metric/5-9mm.md) | 0.2323 | 5.900 |  |  |
| [6 mm](https://shopmath.org/drills/metric/6mm.md) | 0.2362 | 6.000 |  | M7×1 |
| [6.1 mm](https://shopmath.org/drills/metric/6-1mm.md) | 0.2402 | 6.100 |  |  |
| [6.2 mm](https://shopmath.org/drills/metric/6-2mm.md) | 0.2441 | 6.200 |  |  |
| [6.3 mm](https://shopmath.org/drills/metric/6-3mm.md) | 0.2480 | 6.300 |  | M7×0.75 |
| [6.4 mm](https://shopmath.org/drills/metric/6-4mm.md) | 0.2520 | 6.400 |  |  |
| [6.5 mm](https://shopmath.org/drills/metric/6-5mm.md) | 0.2559 | 6.500 |  |  |
| [6.6 mm](https://shopmath.org/drills/metric/6-6mm.md) | 0.2598 | 6.600 |  |  |
| [6.7 mm](https://shopmath.org/drills/metric/6-7mm.md) | 0.2638 | 6.700 |  |  |
| [6.8 mm](https://shopmath.org/drills/metric/6-8mm.md) | 0.2677 | 6.800 |  | M8×1.25 |
| [6.9 mm](https://shopmath.org/drills/metric/6-9mm.md) | 0.2717 | 6.900 |  |  |
| [7 mm](https://shopmath.org/drills/metric/7mm.md) | 0.2756 | 7.000 |  | M8×1 |
| [7.1 mm](https://shopmath.org/drills/metric/7-1mm.md) | 0.2795 | 7.100 |  |  |
| [7.2 mm](https://shopmath.org/drills/metric/7-2mm.md) | 0.2835 | 7.200 |  |  |
| [7.3 mm](https://shopmath.org/drills/metric/7-3mm.md) | 0.2874 | 7.300 |  | M8×0.75 |
| [7.4 mm](https://shopmath.org/drills/metric/7-4mm.md) | 0.2913 | 7.400 |  |  |
| [7.5 mm](https://shopmath.org/drills/metric/7-5mm.md) | 0.2953 | 7.500 |  |  |
| [7.6 mm](https://shopmath.org/drills/metric/7-6mm.md) | 0.2992 | 7.600 |  |  |
| [7.7 mm](https://shopmath.org/drills/metric/7-7mm.md) | 0.3031 | 7.700 |  |  |
| [7.8 mm](https://shopmath.org/drills/metric/7-8mm.md) | 0.3071 | 7.800 |  |  |
| [7.9 mm](https://shopmath.org/drills/metric/7-9mm.md) | 0.3110 | 7.900 |  |  |
| [8 mm](https://shopmath.org/drills/metric/8mm.md) | 0.3150 | 8.000 |  |  |
| [8.1 mm](https://shopmath.org/drills/metric/8-1mm.md) | 0.3189 | 8.100 |  |  |
| [8.2 mm](https://shopmath.org/drills/metric/8-2mm.md) | 0.3228 | 8.200 |  |  |
| [8.3 mm](https://shopmath.org/drills/metric/8-3mm.md) | 0.3268 | 8.300 |  |  |
| [8.4 mm](https://shopmath.org/drills/metric/8-4mm.md) | 0.3307 | 8.400 |  |  |
| [8.5 mm](https://shopmath.org/drills/metric/8-5mm.md) | 0.3346 | 8.500 |  | M10×1.5 |
| [8.6 mm](https://shopmath.org/drills/metric/8-6mm.md) | 0.3386 | 8.600 |  |  |
| [8.7 mm](https://shopmath.org/drills/metric/8-7mm.md) | 0.3425 | 8.700 |  |  |
| [8.8 mm](https://shopmath.org/drills/metric/8-8mm.md) | 0.3465 | 8.800 |  | M10×1.25 |
| [8.9 mm](https://shopmath.org/drills/metric/8-9mm.md) | 0.3504 | 8.900 |  |  |
| [9 mm](https://shopmath.org/drills/metric/9mm.md) | 0.3543 | 9.000 |  | M10×1 |
| [9.1 mm](https://shopmath.org/drills/metric/9-1mm.md) | 0.3583 | 9.100 |  |  |
| [9.2 mm](https://shopmath.org/drills/metric/9-2mm.md) | 0.3622 | 9.200 |  |  |
| [9.3 mm](https://shopmath.org/drills/metric/9-3mm.md) | 0.3661 | 9.300 |  |  |
| [9.4 mm](https://shopmath.org/drills/metric/9-4mm.md) | 0.3701 | 9.400 |  |  |
| [9.5 mm](https://shopmath.org/drills/metric/9-5mm.md) | 0.3740 | 9.500 |  |  |
| [9.6 mm](https://shopmath.org/drills/metric/9-6mm.md) | 0.3780 | 9.600 |  |  |
| [9.7 mm](https://shopmath.org/drills/metric/9-7mm.md) | 0.3819 | 9.700 |  |  |
| [9.8 mm](https://shopmath.org/drills/metric/9-8mm.md) | 0.3858 | 9.800 |  |  |
| [9.9 mm](https://shopmath.org/drills/metric/9-9mm.md) | 0.3898 | 9.900 |  |  |
| [10 mm](https://shopmath.org/drills/metric/10mm.md) | 0.3937 | 10.000 |  |  |
| [10.1 mm](https://shopmath.org/drills/metric/10-1mm.md) | 0.3976 | 10.100 |  |  |
| [10.2 mm](https://shopmath.org/drills/metric/10-2mm.md) | 0.4016 | 10.200 |  |  |
| [10.3 mm](https://shopmath.org/drills/metric/10-3mm.md) | 0.4055 | 10.300 |  | M12×1.75 |
| [10.4 mm](https://shopmath.org/drills/metric/10-4mm.md) | 0.4094 | 10.400 |  |  |
| [10.5 mm](https://shopmath.org/drills/metric/10-5mm.md) | 0.4134 | 10.500 |  | M12×1.5 |
| [10.6 mm](https://shopmath.org/drills/metric/10-6mm.md) | 0.4173 | 10.600 |  |  |
| [10.7 mm](https://shopmath.org/drills/metric/10-7mm.md) | 0.4213 | 10.700 |  |  |
| [10.8 mm](https://shopmath.org/drills/metric/10-8mm.md) | 0.4252 | 10.800 |  | M12×1.25 |
| [10.9 mm](https://shopmath.org/drills/metric/10-9mm.md) | 0.4291 | 10.900 |  |  |
| [11 mm](https://shopmath.org/drills/metric/11mm.md) | 0.4331 | 11.000 |  |  |
| [11.1 mm](https://shopmath.org/drills/metric/11-1mm.md) | 0.4370 | 11.100 |  |  |
| [11.2 mm](https://shopmath.org/drills/metric/11-2mm.md) | 0.4409 | 11.200 |  |  |
| [11.3 mm](https://shopmath.org/drills/metric/11-3mm.md) | 0.4449 | 11.300 |  |  |
| [11.4 mm](https://shopmath.org/drills/metric/11-4mm.md) | 0.4488 | 11.400 |  |  |
| [11.5 mm](https://shopmath.org/drills/metric/11-5mm.md) | 0.4528 | 11.500 |  |  |
| [11.6 mm](https://shopmath.org/drills/metric/11-6mm.md) | 0.4567 | 11.600 |  |  |
| [11.7 mm](https://shopmath.org/drills/metric/11-7mm.md) | 0.4606 | 11.700 |  |  |
| [11.8 mm](https://shopmath.org/drills/metric/11-8mm.md) | 0.4646 | 11.800 |  |  |
| [11.9 mm](https://shopmath.org/drills/metric/11-9mm.md) | 0.4685 | 11.900 |  |  |
| [12 mm](https://shopmath.org/drills/metric/12mm.md) | 0.4724 | 12.000 |  |  |
| [12.1 mm](https://shopmath.org/drills/metric/12-1mm.md) | 0.4764 | 12.100 |  | M14×2 |
| [12.2 mm](https://shopmath.org/drills/metric/12-2mm.md) | 0.4803 | 12.200 |  |  |
| [12.3 mm](https://shopmath.org/drills/metric/12-3mm.md) | 0.4843 | 12.300 |  |  |
| [12.4 mm](https://shopmath.org/drills/metric/12-4mm.md) | 0.4882 | 12.400 |  |  |
| [12.5 mm](https://shopmath.org/drills/metric/12-5mm.md) | 0.4921 | 12.500 |  | M14×1.5 |
| [12.6 mm](https://shopmath.org/drills/metric/12-6mm.md) | 0.4961 | 12.600 |  |  |
| [12.7 mm](https://shopmath.org/drills/metric/12-7mm.md) | 0.5000 | 12.700 |  |  |
| [12.8 mm](https://shopmath.org/drills/metric/12-8mm.md) | 0.5039 | 12.800 |  |  |
| [12.9 mm](https://shopmath.org/drills/metric/12-9mm.md) | 0.5079 | 12.900 |  |  |
| [13 mm](https://shopmath.org/drills/metric/13mm.md) | 0.5118 | 13.000 |  |  |
| [13.1 mm](https://shopmath.org/drills/metric/13-1mm.md) | 0.5157 | 13.100 |  |  |
| [13.2 mm](https://shopmath.org/drills/metric/13-2mm.md) | 0.5197 | 13.200 |  |  |
| [13.3 mm](https://shopmath.org/drills/metric/13-3mm.md) | 0.5236 | 13.300 |  |  |
| [13.4 mm](https://shopmath.org/drills/metric/13-4mm.md) | 0.5276 | 13.400 |  |  |
| [13.5 mm](https://shopmath.org/drills/metric/13-5mm.md) | 0.5315 | 13.500 |  |  |
| [13.6 mm](https://shopmath.org/drills/metric/13-6mm.md) | 0.5354 | 13.600 |  |  |
| [13.7 mm](https://shopmath.org/drills/metric/13-7mm.md) | 0.5394 | 13.700 |  |  |
| [13.8 mm](https://shopmath.org/drills/metric/13-8mm.md) | 0.5433 | 13.800 |  |  |
| [13.9 mm](https://shopmath.org/drills/metric/13-9mm.md) | 0.5472 | 13.900 |  |  |
| [14 mm](https://shopmath.org/drills/metric/14mm.md) | 0.5512 | 14.000 |  | M16×2 |
| [14.25 mm](https://shopmath.org/drills/metric/14-25mm.md) | 0.5610 | 14.250 |  |  |
| [14.5 mm](https://shopmath.org/drills/metric/14-5mm.md) | 0.5709 | 14.500 |  | M16×1.5 |
| [14.75 mm](https://shopmath.org/drills/metric/14-75mm.md) | 0.5807 | 14.750 |  |  |
| [15 mm](https://shopmath.org/drills/metric/15mm.md) | 0.5906 | 15.000 |  |  |
| [15.25 mm](https://shopmath.org/drills/metric/15-25mm.md) | 0.6004 | 15.250 |  |  |
| [15.5 mm](https://shopmath.org/drills/metric/15-5mm.md) | 0.6102 | 15.500 |  | M18×2.5 |
| [15.75 mm](https://shopmath.org/drills/metric/15-75mm.md) | 0.6201 | 15.750 |  |  |
| [16 mm](https://shopmath.org/drills/metric/16mm.md) | 0.6299 | 16.000 |  | M18×2 |
| [16.25 mm](https://shopmath.org/drills/metric/16-25mm.md) | 0.6398 | 16.250 |  |  |
| [16.5 mm](https://shopmath.org/drills/metric/16-5mm.md) | 0.6496 | 16.500 |  | M18×1.5 |
| [16.75 mm](https://shopmath.org/drills/metric/16-75mm.md) | 0.6594 | 16.750 |  |  |
| [17 mm](https://shopmath.org/drills/metric/17mm.md) | 0.6693 | 17.000 |  |  |
| [17.25 mm](https://shopmath.org/drills/metric/17-25mm.md) | 0.6791 | 17.250 |  |  |
| [17.5 mm](https://shopmath.org/drills/metric/17-5mm.md) | 0.6890 | 17.500 |  | M20×2.5 |
| [17.75 mm](https://shopmath.org/drills/metric/17-75mm.md) | 0.6988 | 17.750 |  |  |
| [18 mm](https://shopmath.org/drills/metric/18mm.md) | 0.7087 | 18.000 |  | M20×2 |
| [18.25 mm](https://shopmath.org/drills/metric/18-25mm.md) | 0.7185 | 18.250 |  |  |
| [18.5 mm](https://shopmath.org/drills/metric/18-5mm.md) | 0.7283 | 18.500 |  | M20×1.5 |
| [18.75 mm](https://shopmath.org/drills/metric/18-75mm.md) | 0.7382 | 18.750 |  |  |
| [19 mm](https://shopmath.org/drills/metric/19mm.md) | 0.7480 | 19.000 |  |  |
| [19.25 mm](https://shopmath.org/drills/metric/19-25mm.md) | 0.7579 | 19.250 |  |  |
| [19.5 mm](https://shopmath.org/drills/metric/19-5mm.md) | 0.7677 | 19.500 |  | M22×2.5 |
| [19.75 mm](https://shopmath.org/drills/metric/19-75mm.md) | 0.7776 | 19.750 |  |  |
| [20 mm](https://shopmath.org/drills/metric/20mm.md) | 0.7874 | 20.000 |  | M22×2 |
| [20.25 mm](https://shopmath.org/drills/metric/20-25mm.md) | 0.7972 | 20.250 |  |  |
| [20.5 mm](https://shopmath.org/drills/metric/20-5mm.md) | 0.8071 | 20.500 |  | M22×1.5 |
| [20.75 mm](https://shopmath.org/drills/metric/20-75mm.md) | 0.8169 | 20.750 |  |  |
| [21 mm](https://shopmath.org/drills/metric/21mm.md) | 0.8268 | 21.000 |  | M24×3 |
| [21.25 mm](https://shopmath.org/drills/metric/21-25mm.md) | 0.8366 | 21.250 |  |  |
| [21.5 mm](https://shopmath.org/drills/metric/21-5mm.md) | 0.8465 | 21.500 |  |  |
| [21.75 mm](https://shopmath.org/drills/metric/21-75mm.md) | 0.8563 | 21.750 |  |  |
| [22 mm](https://shopmath.org/drills/metric/22mm.md) | 0.8661 | 22.000 |  | M24×2 |
| [22.25 mm](https://shopmath.org/drills/metric/22-25mm.md) | 0.8760 | 22.250 |  |  |
| [22.5 mm](https://shopmath.org/drills/metric/22-5mm.md) | 0.8858 | 22.500 |  |  |
| [22.75 mm](https://shopmath.org/drills/metric/22-75mm.md) | 0.8957 | 22.750 |  |  |
| [23 mm](https://shopmath.org/drills/metric/23mm.md) | 0.9055 | 23.000 |  |  |
| [23.25 mm](https://shopmath.org/drills/metric/23-25mm.md) | 0.9154 | 23.250 |  |  |
| [23.5 mm](https://shopmath.org/drills/metric/23-5mm.md) | 0.9252 | 23.500 |  |  |
| [23.75 mm](https://shopmath.org/drills/metric/23-75mm.md) | 0.9350 | 23.750 |  |  |
| [24 mm](https://shopmath.org/drills/metric/24mm.md) | 0.9449 | 24.000 |  | M27×3 |
| [24.25 mm](https://shopmath.org/drills/metric/24-25mm.md) | 0.9547 | 24.250 |  |  |
| [24.5 mm](https://shopmath.org/drills/metric/24-5mm.md) | 0.9646 | 24.500 |  |  |
| [24.75 mm](https://shopmath.org/drills/metric/24-75mm.md) | 0.9744 | 24.750 |  |  |
| [25 mm](https://shopmath.org/drills/metric/25mm.md) | 0.9843 | 25.000 |  | M27×2, M30×2, M30×3.5, M33×2, M33×3.5, M36×3, M36×4, M39×3, M39×4, M42×3, M42×4.5, M45×3, M45×4.5, M48×3, M48×5, M52×4, M52×5, M56×4, M56×5.5, M60×4, M60×5.5, M64×4, M64×6 |

_Diameters are nominal. The taps column lists the threads this drill is the recommended tap drill for at the default engagement._

## Sources and Method for the Metric Drill Series

### Metric drill sizes

- **Source**: Number/letter: bd_warehouse drill_sizes.csv (Apache-2.0) cross-checked against Wikipedia Drill bit sizes (CC BY-SA 4.0). Fractional: computed 1/64 in steps per ANSI B94.11M. Metric: computed BS 328 increment pattern.
- **Method**: computed
- **Verified against**: Wikipedia Drill bit sizes (CC BY-SA 4.0); 31/31 checks passed

### Assumptions

- Drill diameters are nominal. A worn or run-out drill cuts oversize.
- Dataset scope: Number sizes #61-#80 are stored but tagged demandTier 'extended' — query-space-map.md Appendix A found the tail thinning in the 60s. Sizes below #80 and metric sizes above 25.0 mm excluded.

**Data last verified**: August 1, 2026

## Related pages

- All drill series: [Drill bit size reference](https://shopmath.org/drills.md)
- Every series interleaved by diameter: [Drill size chart](https://shopmath.org/charts/drill-sizes.md)
- Tap drills by thread: [Tap drill chart](https://shopmath.org/charts/tap-drill.md)

---

*Source: [ShopMath](https://shopmath.org/drills/metric) — data verified August 1, 2026. Reference data; verify against the governing standard before manufacture.*