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Metric tapping drill sizes

The data chart below shows the standard metric ‘coarse’ threads and their drill holes sizes were are most commonly used when tapping sheet metal fabrications.

METRIC COARSE THREAD SIZES in mm
Tap Size Drill size
M2 x 0.4 1.6
M2.5 x 0.45 2.05
M3 x 0.5 2.5
M3.5 x 0.6 2.9
M4 x 0.7 3.3
M4.5 x 0.75 3.7
M5 x 0.8 4.2
M6 x 1.0 5.0
M7 x 1.0 6.0
M8 x 1.25 6.8
M9 x 1.25 7.8
M10 x 1.5 8.5
M11 x 1.5 9.5
M12 x 1.75 10.2
M14 x 2.0 12
M16 x 2.0 14
M18 x 2.5 15.5
M20 x 2.5 17.5
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