Tap Drill Sizes (metric)
| Size (mm) |
Pitch (mm) |
Drill (mm) |
Inch Equiv. |
Drill Inch |
| M1.6 | 0.35 | 1.25 | 0.049 | 3/64 |
| M2 | 0.4 | 1.6 | 0.063 | 1/16 |
| M2.5 | 0.45 | 2.05 | 0.081 | 46 |
| M3 | 0.5 | 2.5 | 0.098 | 40 |
| M4 | 0.7 | 3.3 | 0.130 | 30 |
| M5 | 0.8 | 4.2 | 0.165 | 19 |
| M6 | 1.0 | 5.0 | 0.197 | 9 |
| M6.3 | 1.0 | 5.3 | 0.209 | 4 |
| M7 | 1.0 | 6.0 | 0.236 | 15/64 |
| M8 | 1.25 1.0 |
6.75 7.0 |
0.266 0.276 |
17/64 J |
| M10 | 1.5 1.25 |
8.5 8.75 |
0.335 0.344 |
Q 11/32 |
| M12 | 1.75 1.25 |
10.2 10.7 |
0.402 0.421 |
Y 27/64 |
| M14 | 2.0 1.5 |
12.0 12.5 |
0.472 0.492 |
15/32 31/64 |
| M16 | 2.0 1.5 |
14.0 14.5 |
0.551 0.571 |
35/64 9/16 |
| M18 | 2.5 1.5 |
15.5 16.5 |
0.610 0.650 |
39/64 41/64 |
| M20 | 2.5 1.5 |
17.5 18.5 |
0.689 0.728 |
11/16 23/32 |
| M24 | 3.0 2.0 |
21.0 22.0 |
0.827 0.866 |
53/64 55/64 |
| M30 | 3.5 2.0 |
26.5 28.0 |
1.043 1.102 |
1 3/64 1 7/64 |
| M33 | 3.5 2.0 |
29.5 31.0 |
1.161 1.220 |
1 11/64 1 7/32 |
| M36 | 4.0 3.0 |
32.0 33.0 |
1.260 1.299 |
1 1/4 1 19/64 |
| M39 | 4.0 3.0 |
35.0 36.0 |
1.378 1.417 |
1 3/8 1 27/64 |