Pre Tap Drill Size

Metric Cutting Tap

Tap
Drill Size
Decimal Equivalent
M39 x 3.00
36.00MM
1.4173
M39 x 4.00
35.00MM
1.3780
M36 x 3.00
33.00MM
1.2992
M36 x 4.00
32.00MM
1.2598
M33 x 2.00
31.00MM
1.2205
M33 x 3.50
29.50MM
1.1614
M30 x 2.00
28.00MM
1.1024
M30 x 3.50
26.50MM
1.0433
M27 x 2.00
25.00MM
0.9843
M27 x 3.00
24.00MM
0.9449
M24 x 2.00
22.00MM
0.8661
M24 x 3.00
21.00MM
0.8268
M22 x 1.50
20.50MM
0.8071
M22 x 2.50
19.50MM
0.7677
M20 x 1.50
18.50MM
0.7283
M20 x 2.50
17.50MM
0.6890
M18 x 1.50
16.50MM
0.6496
M18 x 2.50
15.50MM
0.6102
M16 x 1.50
14.50MM
0.5709
M16 x 2.00
14.00MM
0.5512
M14 x 2.00
12.00MM
0.4724
M12 x 1.25
10.80MM
0.4252
M12 x 1.75
10.20MM
0.4016
M10 x 1.25
8.70MM
0.3425
M10 x 1.50
8.50MM
0.3346
M8 x 1.00
7.00MM
0.2756
M8 x 1.25
6.70MM
0.2638
M7 x 1.00
6.00MM
0.2362
M6 x 1.00
5.00MM
0.1969
M5 x 0.80
4.20MM
0.1654
M4.5 x 0.75
3.70MM
0.1476
M4 x 0.70
3.30MM
0.1299
M3.5 x 0.60
2.90MM
0.1142
M3 x 0.50
2.50MM
0.0984
M2.5 x 0.45
2.05MM
0.0807
M2.2 x 0.45
1.75MM
0.0689
M2 x 0.40
1.60MM
0.0630
M1.8 x 0.35
1.45MM
0.0571
M1.6 x 0.35
1.25MM
0.0492