55
RECOMMENDED TAPPING DRILL SIZES
(For 75% thread depth)
Metric Coarse
Size
Pitch
0.4
0.45
0.5
0.6
0.7
0.75
0.8
1
1
1.25
1.25
1.5
1.5
1.75
2
2
2.5
2.5
2.5
3
3
3.5
3.5
3.5
4
4
4.5
4.5
5
5
5.5
Tapping
Drill Size (mm)
*Fluteless Tapping Drill Sizes
2
2.5
3
3.5
4
4.5
5
6
7
8
9
10
11
12
14
16
18
20
22
24
27
30
32
33
36
39
42
45
48
52
56
1.6 (1.8)*
2.05
2.5 (2.75)*
2.9 (3.2)*
3.3 (3.65)*
3.7 (4.1)*
4.2 (4.6)*
5 (5.5)*
6
6.8 (7.4)*
7.8
8.5 (9.25)*
9.5
10.2 (11.1)*
12
14
15.5
17.5
19.5
21
24
26.5
30.5
29.5
32
35
37.5
40.5
43
47
50.5
