Metric Tapping Information
This page contains information regarding tap and clearance drills for metric
machine screws including the decimal equivalents from 1 mm to 30 mm (~1.2 inch).
| Screw Size |
Tap Drill |
Clearance Drill |
| Nom. Dia. (mm) |
Pitch (mm) |
Series |
Drill Size
(65-75% thread) (mm) |
Dec. Equiv. (inch) |
Close Fit |
Free Fit |
| Drill Size (mm) |
Dec. Equiv. (inch) |
Drill Size (mm) |
Decimal Equiv. (inch) |
| 1 |
0.20 |
Fine |
0.80 |
0.0315 |
1.05 |
0.0413 |
1.20 |
0.0472 |
| 0.25 |
Coarse |
0.75 |
0.0295 |
| 1.1 |
0.20 |
Fine |
0.90 |
0.0354 |
1.15 |
0.0453 |
1.30 |
0.0512 |
| 0.25 |
Coarse |
0.85 |
0.0335 |
| 1.2 |
0.20 |
Fine |
1.00 |
0.0394 |
1.30 |
0.0512 |
1.50 |
0.0590 |
| 0.25 |
Coarse |
0.95 |
0.0374 |
| 1.4 |
0.20 |
Fine |
1.20 |
0.0472 |
1.50 |
0.0591 |
1.70 |
0.0669 |
| 0.30 |
Coarse |
1.10 |
0.0433 |
| 1.6 |
0.20 |
Fine |
1.40 |
0.0551 |
1.70 |
0.0669 |
2.00 |
0.0787 |
| 0.35 |
Coarse |
1.25 |
0.0492 |
| 1.8 |
0.20 |
Fine |
1.60 |
0.0630 |
1.90 |
0.0748 |
2.20 |
0.0866 |
| 0.35 |
Coarse |
1.45 |
0.0571 |
| 2 |
0.25 |
Fine |
1.75 |
0.0689 |
2.20 |
0.0866 |
2.60 |
0.1024 |
| 0.40 |
Coarse |
1.60 |
0.0630 |
| 2.2 |
0.25 |
Fine |
1.95 |
0.0768 |
2.40 |
0.0945 |
2.80 |
0.1102 |
| 0.45 |
Coarse |
1.75 |
0.0689 |
| 2.5 |
0.35 |
Fine |
2.15 |
0.0846 |
2.70 |
0.1063 |
3.10 |
0.1220 |
| 0.45 |
Coarse |
2.05 |
0.0807 |
| 3 |
0.35 |
Fine |
2.65 |
0.1043 |
3.20 |
0.1260 |
3.60 |
0.1417 |
| 0.50 |
Coarse |
2.50 |
0.0984 |
| 3.5 |
0.35 |
Fine |
3.15 |
0.1240 |
3.70 |
0.1457 |
4.20 |
0.1653 |
| 0.60 |
Coarse |
2.90 |
0.1142 |
| 4 |
0.50 |
Fine |
3.50 |
0.1378 |
4.30 |
0.1693 |
4.80 |
0.1890 |
| 0.70 |
Coarse |
3.30 |
0.1299 |
| 4.5 |
0.50 |
Fine |
4.00 |
0.1575 |
4.80 |
0.1890 |
5.30 |
0.2087 |
| 0.75 |
Coarse |
3.70 |
0.1457 |
| 5 |
0.50 |
Fine |
4.50 |
0.1772 |
5.30 |
0.2087 |
5.80 |
0.2283 |
| 0.80 |
Coarse |
4.20 |
0.1654 |
| 6 |
0.75 |
Fine |
5.25 |
0.2067 |
6.40 |
0.2520 |
7.00 |
0.2756 |
| 1.00 |
Coarse |
5.00 |
0.1969 |
| 7 |
0.75 |
Fine |
6.25 |
0.2461 |
7.40 |
0.2913 |
8.00 |
0.3150 |
| 1.00 |
Coarse |
6.00 |
0.2362 |
| 8 |
0.75 |
Fine |
7.25 |
0.2854 |
8.40 |
0.3307 |
10.00 |
0.3937 |
| 1.00 |
Fine |
7.50 |
0.2953 |
| 1.25 |
Coarse |
6.80 |
0.2677 |
| 9 |
0.75 |
Fine |
8.25 |
0.3248 |
9.50 |
0.3740 |
10.50 |
0.4134 |
| 1.00 |
Fine |
8.00 |
0.3150 |
| 1.25 |
Coarse |
7.80 |
0.3071 |
| 10 |
0.75 |
Fine |
9.25 |
0.3642 |
10.50 |
0.4134 |
12.00 |
0.4724 |
| 1.00 |
Fine |
9.00 |
0.3543 |
| 1.25 |
Fine |
8.80 |
0.3465 |
| 1.50 |
Coarse |
8.50 |
0.3346 |
| 11 |
0.75 |
Fine |
10.25 |
0.4035 |
12.00 |
0.4724 |
13.00 |
0.5118 |
| 1.00 |
Fine |
10.00 |
0.3937 |
| 1.50 |
Coarse |
9.50 |
0.3740 |
| 12 |
1.00 |
Fine |
11.00 |
0.4331 |
13.00 |
0.5118 |
15.00 |
0.5905 |
| 1.25 |
Fine |
10.75 |
0.4232 |
| 1.50 |
Fine |
10.50 |
0.4134 |
| 1.75 |
Coarse |
10.20 |
0.4016 |
| 14 |
1.00 |
Fine |
13.00 |
0.5118 |
15.00 |
0.5905 |
17.00 |
.6693 |
| 1.25 |
Fine |
12.80 |
0.5039 |
| 1.50 |
Fine |
12.50 |
0.4921 |
| 2.00 |
Coarse |
12.00 |
0.4724 |
| 15 |
1.00 |
Fine |
14.00 |
0.5512 |
16.00 |
0.6299 |
18.00 |
0.7087 |
| 1.50 |
Fine |
13.50 |
0.5315 |
| 16 |
1.00 |
Fine |
15.00 |
0.5906 |
17.00 |
0.6693 |
19.00 |
0.7480 |
| 1.50 |
Fine |
14.50 |
0.5709 |
| 2.00 |
Coarse |
14.00 |
0.5512 |
| 17 |
1.00 |
Fine |
16.00 |
0.6299 |
18.00 |
0.7087 |
20.00 |
0.7874 |
| 1.50 |
Fine |
15.50 |
0.6103 |
| 18 |
1.00 |
Fine |
17.00 |
0.6693 |
19.00 |
0.7480 |
21.00 |
0.8268 |
| 1.50 |
Fine |
16.50 |
0.6496 |
| 2.00 |
Fine |
16.00 |
0.6299 |
| 2.50 |
Coarse |
15.50 |
0.6102 |
| 20 |
1.00 |
Fine |
19.00 |
0.7480 |
21.00 |
0.8268 |
24.00 |
0.9449 |
| 1.50 |
Fine |
18.50 |
0.7283 |
| 2.00 |
Fine |
18.00 |
0.7087 |
| 2.50 |
Coarse |
17.50 |
0.6890 |
| 30 |
1.00 |
Fine |
29.00 |
1.1417 |
31.00 |
1.2205 |
35.00 |
1.3779 |
| 1.50 |
Fine |
28.50 |
1.1220 |
| 2.00 |
Fine |
28.00 |
1.1024 |
| 3.00 |
Fine |
27.00 |
1.0630 |
| 3.50 |
Coarse |
26.50 |
1.0433 |
| Nom. Dia. (mm) |
Pitch (mm) |
Series |
Drill Size
(65-75% thread) (mm) |
Dec. Equiv. (inch) |
Drill Size (mm) |
Dec. Equiv. (inch) |
Drill Size (mm) |
Dec. Equiv. (inch) |
| Close Fit |
Free Fit |
| Screw Size |
Tapping Drill |
Clearance Drill |
This page was last updated 04/24/06 10:42 AM 5715
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