Dalam dunia permesinan dan fabrikasi, memilih ukuran mata bor yang sesuai sebelum melakukan proses tap adalah kunci untuk mendapatkan hasil yang maksimal dan presisi. Proses tap digunakan untuk membuat ulir dalam pada benda kerja, dan untuk memastikan ulir tersebut terbentuk dengan sempurna sesuai standar toleransi, diperlukan ukuran mata bor yang sesuai.
Berikut ini rekomendasi ukuran mata bor ( drill ) untuk tap, proses tapping, threading/pembuatan ulir metris yang digunakan pada proses hand tap atau tap mesin (machine tap) dalam standar Metric (Metrik) :
| Thread Size | Ukuran Drill (mm) | Toleransi ukuran Lubang (mm) | |
| Max. | Min. | ||
| M2 × 0.4 | 1.60 | 1.679 | 1.567 |
| M2 × 0.25 | 1.75 | 1.785 | 1.729 |
| M2.2 × 0.45 | 1.75 | 1.838 | 1.713 |
| M2.2 × 0.25 | 1.95 | 1.985 | 1.929 |
| M2.2 × 0.4 | 1.90 | 1.979 | 1.867 |
| M2.3 × 0.25 | 2.05 | 2.061 | 2.001 |
| M2.5 × 0.45 | 2.10 | 2.138 | 5.013 |
| M2.5 × 0.35 | 2.20 | 2.221 | 2.121 |
| M2.6 × 0.45 | 2.20 | 2.238 | 2.113 |
| M2.6 × 0.35 | 2.20 | 2.246 | 2.186 |
| M3 × 0.5 | 2.50 | 2.599 | 2.459 |
| M3 × 0.35 | 2.70 | 2.721 | 2.621 |
| M3.5 × 0.6 | 2.90 | 3.010 | 2.850 |
| M3.5 × 0.35 | 3.20 | 3.221 | 3.121 |
| M4 × 0.7 | 3.30 | 3.422 | 3.242 |
| M4 × 0.5 | 3.50 | 3.599 | 3.459 |
| M4.5 × 0.75 | 3.80 | 3.878 | 3.688 |
| M4.5 × 0.5 | 4.00 | 4.099 | 3.959 |
| M5 × 0.8 | 4.20 | 4.334 | 4.134 |
| M5 × 0.5 | 4.50 | 4.599 | 4.459 |
| M6 × 1 | 5.00 | 5.153 | 4.917 |
| M6 × 0.75 | 5.30 | 5.378 | 5.188 |
| M6 × 0.5 | 5.50 | 5.550 | 5.400 |
| M7 × 1 | 6.00 | 6.153 | 5.917 |
| M7 × 0.75 | 6.30 | 6.378 | 6.188 |
| M7 × 0.5 | 6.50 | 6.550 | 6.400 |
| M8 × 1.25 | 6.80 | 6.912 | 6.647 |
| M8 × 1 | 7.00 | 7.153 | 6.917 |
| M8 × 0.75 | 7.30 | 7.378 | 7.188 |
| M8 × 0.5 | 7.50 | 7.520 | 7.400 |
| M9 × 1.25 | 7.80 | 7.912 | 7.647 |
| M9 × 1 | 8.00 | 8.153 | 7.917 |
| M9 × 0.75 | 8.30 | 8.378 | 8.188 |
| M10 × 1.5 | 8.50 | 8.676 | 8.376 |
| M10 × 1.25 | 8.80 | 8.912 | 8.647 |
| M10 × 1 | 9.00 | 9.153 | 8.917 |
| M10 × 0.75 | 9.30 | 9.378 | 9.188 |
| M10 × 0.5 | 9.50 | 9.520 | 9.400 |
| M11 × 1.5 | 9.50 | 9.676 | 9.376 |
| M11 × 1 | 10.00 | 10.153 | 9.917 |
| M11 × 0.75 | 10.30 | 10.378 | 10.188 |
| M12 × 1.75 | 10.30 | 10.441 | 10.106 |
| M12 × 1.5 | 10.50 | 10.676 | 10.376 |
| M12 × 1.25 | 10.80 | 10.912 | 10.647 |
| M12 × 1 | 11.00 | 11.153 | 10.917 |
| M12 × 0.5 | 11.50 | 11.520 | 11.400 |
| M14 × 2 | 12.00 | 12.210 | 11.835 |
| M14 × 1.5 | 12.50 | 12.676 | 12.376 |
| M14 × 1 | 13.00 | 13.153 | 12.917 |
| M15 × 1.5 | 13.50 | 13.673 | 13.376 |
| M15 × 1 | 14.00 | 14.153 | 13.917 |
| M16 × 2 | 14.00 | 14.210 | 13.835 |
| M16 × 1.5 | 14.50 | 14.676 | 14.376 |
| M16 × 1 | 15.00 | 15.153 | 14.917 |
| M17 × 1.5 | 15.50 | 15.676 | 15.376 |
| M17 × 1 | 16.00 | 16.153 | 15.917 |
| M18 × 2.5 | 15.50 | 15.744 | 15.294 |
| M18 × 2 | 16.00 | 16.210 | 15.835 |
| M18 × 1.5 | 16.50 | 16.676 | 16.376 |
| M18 × 1 | 17.00 | 17.153 | 16.917 |
| M20 × 2.5 | 17.50 | 17.744 | 17.294 |
| M20 × 2 | 18.00 | 18.210 | 17.835 |
| M20 × 1.5 | 18.50 | 18.676 | 18.376 |
| M20 × 1 | 19.00 | 19.153 | 18.917 |
| M22 × 2.5 | 19.50 | 19.744 | 19.294 |
| M22 × 2 | 20.00 | 20.210 | 19.835 |
| M22 × 1.5 | 20.50 | 20.673 | 20.376 |
| M22 × 1 | 21.00 | 21.153 | 20.917 |
| M24 × 3 | 21.00 | 21.252 | 20.752 |
| M24 × 2 | 22.00 | 22.210 | 21.835 |
| M24 × 1.5 | 22.50 | 22.676 | 22.376 |
| M24 × 1 | 23.00 | 23.153 | 22.917 |
| M25 × 2 | 23.00 | 23.210 | 22.835 |
| M25 × 1.5 | 23.50 | 23.676 | 23.376 |
| M25 × 1 | 24.00 | 24.153 | 23.917 |
| M26 × 1.5 | 24.50 | 24.676 | 24.376 |
| M27 × 3 | 24.00 | 24.252 | 23.752 |
| M27 × 2 | 25.00 | 25.210 | 24.835 |
| M27 × 1.5 | 25.50 | 25.676 | 25.376 |
| M27 × 1 | 26.00 | 26.153 | 25.917 |
| M28 × 2 | 26.00 | 26.210 | 25.835 |
| M28 × 1.5 | 26.50 | 26.676 | 26.376 |
| M28 × 1 | 27.00 | 27.153 | 26.917 |
| M30 × 3.5 | 26.50 | 26.771 | 26.211 |
| M30 × 3 | 27.00 | 27.252 | 26.752 |
| M30 × 2 | 28.00 | 28.210 | 27.835 |
| M30 × 1.5 | 28.50 | 28.676 | 28.376 |
| M30 × 1 | 29.00 | 29.153 | 28.917 |
| M32 × 2 | 30.00 | 30.210 | 29.835 |
| M32 × 1.5 | 30.50 | 30.676 | 30.376 |
| M33 × 3.5 | 29.50 | 29.771 | 29.211 |
| M33 × 3 | 30.00 | 30.252 | 29.752 |
| M33 × 2 | 31.00 | 31.210 | 30.835 |
| M33 × 1.5 | 31.50 | 31.676 | 31.376 |
| M35 × 1.5 | 33.50 | 33.676 | 33.376 |
| M36 × 4 | 32.00 | 32.270 | 31.670 |
| M36 × 3 | 33.00 | 33.252 | 32.752 |
| M36 × 2 | 34.00 | 34.210 | 33.835 |
| M36 × 1.5 | 34.50 | 34.676 | 34.376 |
| M38 × 1.5 | 36.50 | 36.676 | 36.376 |
| M39 × 4 | 35.00 | 35.270 | 34.670 |
| M39 × 3 | 36.00 | 36.252 | 35.752 |
| M39 × 2 | 37.00 | 37.210 | 36.835 |
| M39 × 1.5 | 37.50 | 37.676 | 37.376 |
| M40 × 3 | 37.00 | 37.252 | 36.752 |
| M40 × 2 | 38.00 | 38.210 | 37.835 |
| M40 × 1.5 | 38.50 | 38.676 | 38.376 |
| M42 × 4.5 | 37.50 | 37.799 | 37.129 |
| M42 × 4 | 38.00 | 38.270 | 37.670 |
| M42 × 3 | 39.00 | 39.252 | 38.752 |
| M42 × 2 | 40.00 | 40.210 | 39.835 |
| M42 × 1.5 | 40.50 | 40.676 | 40.376 |
| M45 × 4.5 | 40.50 | 40.799 | 40.129 |
| M45 × 4 | 41.00 | 41.270 | 40.670 |
| M45 × 3 | 42.00 | 42.252 | 41.752 |
| M45 × 2 | 43.00 | 43.210 | 72.835 |
| M45 × 1.5 | 43.50 | 43.676 | 73.376 |
| M48 × 5 | 43.00 | 43.297 | 42.587 |
| M48 × 4 | 44.00 | 44.270 | 43.670 |
| M48 × 3 | 45.00 | 45.252 | 44.752 |
| M48 × 2 | 46.00 | 46.210 | 45.835 |
| M48 × 1.5 | 46.50 | 46.676 | 46.376 |
| M50 × 3 | 47.00 | 47.252 | 46.752 |
| M50 × 2 | 48.00 | 48.210 | 47.835 |
| M50 × 1.5 | 48.50 | 48.676 | 48.376 |
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