Metric Tap Size Chart (M1 ~ M24)

Thread Size	Coarse Pitch (mm)	Drill Size (mm)	Fine Pitch (mm)	Drill Size (mm)
M1.0	0.25	0.75	—	—
M1.2	0.25	0.95	—	—
M1.4	0.30	1.10	—	—
M1.6	0.35	1.25	—	—
M1.8	0.35	1.45	—	—
M2.0	0.40	1.60	—	—
M2.2	0.45	1.75	—	—
M2.5	0.45	2.05	—	—
M3.0	0.50	2.50	0.35 / 0.25	2.65 / 2.75
M3.5	0.60	2.90	—	—
M4.0	0.70	3.30	0.50	3.50
M5.0	0.80	4.20	0.75 / 0.50	4.25 / 4.50
M6.0	1.00	5.00	0.75 / 0.50	5.25 / 5.50
M7.0	1.00	6.00	0.75	6.25
M8.0	1.25	6.75	1.00 / 0.75	7.00 / 7.25
M9.0	1.25	7.75	1.00	8.00
M10	1.50	8.50	1.25 / 1.00	8.75 / 9.00
M11	1.50	9.50	1.00	10.00
M12	1.75	10.20	1.50 / 1.25	10.50 / 10.75
M14	2.00	12.00	1.50	12.50
M15	2.00	13.00	1.50	13.50
M16	2.00	14.00	1.50 / 1.00	14.50 / 15.00
M18	2.50	15.50	2.00 / 1.50	16.00 / 16.50
M20	2.50	17.50	2.00 / 1.50	18.00 / 18.50
M22	2.50	19.50	2.00 / 1.50	20.00 / 20.50
M24	3.00	21.00	2.00	22.00

Notes:

Drill size is the recommended tapping drill diameter (≈ Major Diameter − Pitch).

Coarse pitch is the default ISO 261/965 standard thread.

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