Hole machining
Thread Pilot Hole Diameters Before Tapping M Metric ISO coarse pitch thread DIN 13 and DIN ISO 965-1
MF
Metric ISO fine pitch thread DIN 13 and DIN ISO 965-1
D
D1
D
D1
Max (mm) 5H/6H
Diameter
Min ( mm)
Diameter
Max (mm) 5H/6H
Diameter x P M3.5x0.35 M4x0.35 M4x0.5 M4.5x0.5 M5x0.35
Diameter
M4
3.242 3.688 4.134 4.917 5.917 6.647 7.647 8.376 9.376
3.422 3.878 4.334 5.153 6.153 6.912 7.912 8.676 9.676
3.30 3.70 4.20 5.00 6.00 6.80 7.80 8.50 9.50
3.221 3.721 3.599 4.099 4.721 4.599 4.378 5.599 5.378 6.599 6.378 7.599 7.378 7.153 8.378 8.153 9.599 9.378 9.153 8.912
3.15 3.65 3.50 4.00 4.65 4.50 4.20 5.50 5.25 6.50 6.25 7.50 7.25 7.00 8.25 8.00 9.50 9.25 9.00 8.75
M4.5
M5 M6 M7 M8 M9
M5x0.5 M5x0.75 M5x0.5 M6x0.75 M7x0.5 M7x0.75 M8x0.5 M8x0.75
M10 M11 M12 M14 M16 M18 M20 M22
10.106 11.835 13.835 15.294 17.294 19.294
10.441 12.210 14.210 15.744 17.744 19.744
10.20 12.00 14.00 15.50 17.50 19.50
M8x1
M9x0.75
UNC
M9x1
Coarse thread ASME B1.1 standard
M10x0.5 M10x0.75
M10x1
D
D1
M10x1.25
Diameter P Gg/1" 8-32 UNC 10-24 UNC 12-24 UNC
Min (mm) 2B/3B
Max (mm) 2B
M11x1
10.153 11.599 11.153 10.912 10.676 12.153 13.378 13.153 12.912 12.676 14.153 13.676 15.378 15.153 14.912 14.676 16.153 17.153 16.676
10.00 11.50 11.00 10.75 10.50 12.00 13.20 13.00 12.75 12.50 14.00 13.50 15.20 15.00 14.80 14.50 16.00 17.00 16.50 16.00 19.00 18.50 18.00
Diameter
M12x0.5
3.302 3.683 4.343
3.531 3.962 4.597 5.268 6.734 8.164 9.550
3.50 3.90 4.50 5.10 6.60 8.00 9.40
M12x1
M12x1.25 M12x1.5
1/4-20 UNC 4.976 5/16-18 UNC 6.411 3/8-16 UNC 7.805 7/16-14 UNC 9.149 1/2-13 UNC 10.584 9/16-12 UNC 11.996 5/8-11 UNC 13.376 3/4-10 UNC 16.299 7/8-9 UNC 19.169
M13x1
M14x0.75
M14x1
M14x1.25 M14x1.5
11.013 12.456 13.868 16.833 19.748
10.28 12.20 13.50 16.50 19.50
M15x1
M15x1.5 M16x0.75
M16x1
M16x1.25 M16x1.5
UNF
Fine thread ASME B1.1 standard
M17x1 M18x1
D
D1
M18x1.5
M18x2 M20x1
16.21
Diameter P Gg/1" 8-36 UNF 10-32 UNF 12-28 UNF
Min (mm) 2B/3B
Max (mm) 2B
Diameter
19.153 18.676
M20x1.5
3.404 3.962 4.496 5.367 6.792 8.379 9.738
3.607 4.166 4.724 5.580 7.038 8.626
3.50 4.10 4.60 5.50 6.90 8.50 9.90
M20x2
18.21
1/4-28 UNF 5/16-24 UNF 3/8-24 UNF 7/16-20 UNF 1/2-20 UNF
10.030 11.618 13.084 14.671 17.689
11.326
11.50 12.90 14.50 17.50
9/16-18 UNF 12.761
5/8-18 UNF 3/4-16 UNF
14.348 17.330
420
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