Metric Tap Drills
| Tap size |
Major Diameter |
Millimeters |
Tap Drill |
| mm |
inch |
Per Thread |
Size |
mm |
Dia. |
| M1.6 x 0.35 |
1.6 |
.063 |
.35 |
#55 |
1.25 |
.052 |
| M2 x 0.4 |
2 |
.079 |
.4 |
#52 |
1.6 |
.064 |
| M2.5 x 0.45 |
2.5 |
.098 |
.45 |
#46 |
2.05 |
.081 |
| M3 x .05 |
3 |
.118 |
.5 |
#39 |
2.5 |
.100 |
| M3.5 x 0.6 |
3.5 |
.138 |
.6 |
#32 |
2.9 |
.116 |
| M4 x 0.7 |
4 |
.158 |
.7 |
#30 |
3.3 |
.129 |
| M5 x 0.8 |
5 |
.197 |
.8 |
#19 |
4.2 |
.177 |
| M6 x 1 |
6 |
.236 |
1 |
#8 |
5 |
.199 |
| M8 x 1.25 |
8 |
.315 |
1.25 |
H |
6.8 |
.266 |
| M8 x 1 |
8 |
.315 |
1 |
J |
7 |
.277 |
| M10 x 1.5 |
10 |
.394 |
1.5 |
R |
8.5 |
.339 |
| M10 x 1.25 |
10 |
.394 |
1.25 |
11/32 |
8.8 |
.344 |
| M12 x 1.75 |
12 |
.472 |
1.75 |
13/32 |
10.2 |
.406 |
| M12 x 1.25 |
12 |
.472 |
1.25 |
27/64 |
10.8 |
.422 |
| M14 x 2 |
14 |
.551 |
2 |
15/32 |
12 |
.469 |
| M14 x 1.5 |
14 |
.551 |
1.5 |
1/2 |
12.5 |
.500 |
| M16 x 2 |
16 |
.630 |
2 |
35/64 |
14 |
.547 |
| M16 x 1.5 |
16 |
.630 |
1.5 |
37/64 |
14.5 |
.578 |
| M18 x 2.5 |
18 |
.709 |
2.5 |
39/64 |
15.5 |
.609 |
| M18 x 1.5 |
18 |
.709 |
1.5 |
21/32 |
16.5 |
.656 |
| M20 x 2.5 |
20 |
.787 |
2.5 |
11/16 |
17.5 |
.688 |
| M20 x 1.5 |
20 |
.787 |
1.5 |
47/64 |
18.5 |
.734 |
| M22 x 2.5 |
22 |
.866 |
2.5 |
49/64 |
19.5 |
.766 |
| M22 x 1.5 |
22 |
.866 |
1.5 |
13/16 |
20.5 |
.813 |
| M24 x 3 |
24 |
.945 |
3 |
53/64 |
21 |
.828 |
| M24 x 2 |
24 |
.945 |
2 |
7/8 |
22 |
.875 |
| M27 x 3 |
27 |
1.063 |
3 |
15/16 |
24 |
.938 |
| M27 x 2 |
27 |
1.063 |
2 |
1" |
25 |
1.000 |