FORJAY Machine Shop

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