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Choice of pre-hole diameter

Tapping
dimensions

Diameters of pre-holes
for a tolerance 6H (mm)

Diameters of pre-holes
for a tolerance 6G (mm)

75%
65%
55%
75%
65%
55%
M1.6 x 0.35
1.46
1.48
1.49
1.47
1.50
1.52
M2 x 0.40
1.83
1.85
1.87
1.86
1.88
1.90
M2.5 x 0.45
2.31
2.33
2.36
2.34
2.37
2.39
M3 x 0.50
2.79
2.81
2.84
2.82
2.84
2.87
M3.5 x 0.60
3.24
3.27
3.30
3.27
3.30
3.33
M4 x 0.70
3.68
3.72
3.75
3.72
3.75
3.78
M5 x 0.80
4.63
4.67
4.71
4.67
4.71
4.75
M6 x 1.00
5.54
5.59
5.64
5.57
5.62
5.67
M8 x 1.00
7.54
7.59
7.64
7.57
7.62
7.67
M8 x 1.25
7.40
7.46
7.52
7.44
7.50
7.57
M10 x 1.50
9.27
9.35
9.42
9.31
9.39
9.46
M12 x 1.50
11.27
11.35
11.42
11.31
11.39
11.46
M12 x 1.75
11.14
11.23
11.32
11.18
11.25
11.35
M14 x 1.50
13.27
13.35
13.42
13.31
13.39
13.46
M16 x 1.50
15.27
15.35
15.42
15.31
15.39
15.46

Tapping
dimensions

Diameters of pre-holes for a tolerance 2B (mm)

75%
65%
55%
0-80
1.39
1.40
1.42
1-64
1.68
1.70
1.73
1-72
1.70
1.73
1.75
2-56
1.98
2.01
2.03
2-64
2.01
2.03
2.06
3-48
2.29
2.31
2.34
3-56
2.31
2.34
2.36
4-40
2.54
2.57
2.62
4-48
2.62
2.64
2.67
5-40
2.87
2.80
2.95
5-44
2.90
2.92
2.97
6-32
3.15
3.18
3.20
6-40
3.20
3.23
3.25
8-32
3.78
3.81
3.86
8-36
3.84
3.86
3.89
10-24
4.32
4.37
4.42
10-32
4.45
4.47
4.52
12-24
4.98
5.03
5.08
12-28
4.05
5.11
5.16
1/4-20
5.72
5.77
5.84
1/4-28
5.92
5.97
6.02
5/16-18
7.24
7.29
7.39
5/16-24
7.42
7.47
7.54
3/8-16
8.74
8.81
8.89
3/8-24
9.02
9.04
9.12
7/16-14
10.21
10.29
10.39
7/16-20
10.52
10.57
10.62
1/2-13
11.73
11.84
11.94
1/2-20
12.07
12.12
12.19
9/16-12
13.21
13.31
13.41
9/16-18
13.59
13.64
13.72
5/8-18
15.19
15.24
15.32

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