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Reference table

Metric Thread & Tap Drill Chart

Use as a quick reference and verify against the standard or material specification governing your work.

SizeCoarse pitch (mm)Approx. tap drill (mm)
M30.52.5
M40.73.3
M50.84.2
M61.05.0
M81.256.8
M101.58.5
M121.7510.2
M162.014.0
M202.517.5

Values are general reference values and may vary by specification, alloy, tolerance class and manufacturer.