Hole machining
Thread Pilot Hole Diameters Before Forming
M
MF
Metric ISO coarse pitch thread DIN 13 and DIN ISO 965-1
Metric ISO fine pitch thread DIN 13 and DIN ISO 965-1
D
D
Diameter
Diameter
Diameter x P
Diameter
M3.5
3.25 3.70 4.65 5.55 7.40 9.30
M4x0.5 M5x0.5 M6x0.5 M6x0.75 M7x0.75 M8x0.75
3.80 4.80 5.80 5.65 6.65 7.65 7.55 9.65 9.55 9.40
M4 M5 M6 M8
M10 M12 M14 M16 M18 M20
11.20 13.10 15.10 16.90 18.90
M8x1
M10x0.75
M10x1
M10x1.25
M12x1
11.55 11.40 11.30 13.55 13.30 15.55 15.30 17.55 17.30 19.30 19.10 21.30
M12x1.25 M12x1.5
M14x1
M14x1.5
M16x1
M16x1.5
M18x1
M18x1.5 M20x1.5
M20x2
M22x1.5
UNC
UNF
Coarse thread ASME B1.1 standard
Fine thread ASME B1.1 standard
D
D
Diameter 6-32 UNC 8-32 UNC 10-24 UNC
Diameter
Diameter 6-40 UNF 8-36 UNF 10-32 UNF
Diameter
3.15 3.80 4.30 5.00 5.75 7.25 8.75
3.20 3.85 4.45 5.05 5.90 7.45 9.00
12-24 UNC 1/4-20 UNC 5/16-18 UNC 3/8-16 UNC 7/16-14 UNC 1/2-13 UNC 9/16-12 UNC 5/8-11 UNC 3/4-10 UNC
12-28 UNF 1/4-28 UNF 5/16-24 UNF 3/8-24 UNF 7/16-20 UNF 1/2-20 UNF 9/16-18 UNF 5/8-18 UNF 3/4-16 UNF
10.30 11.80 13.30 14.80 17.90
10.50 12.10 13.70 15.25 18.40
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