Thelen Tree Farm

Celebrating 17 Years - 2001 ~ 2018  



Metric Tapping Information

This page contains information regarding tap and clearance drills for metric machine screws including the decimal equivalents from 1 mm to 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