Metric tap drill chart

Tap drill sizes for 29 metric threads: diameter minus pitch. Click a thread for its full page.

Metric tap drill chart
Thread	Pitch	Tap drill	Inches	Closest inch bit	Thread	Clearance, close	Clearance, medium
M1.6 x 0.35	Coarse	1.25 mm	0.0492	#55	77%	1.7 mm	1.8 mm
M2 x 0.4	Coarse	1.6 mm	0.0630	1/16"	77%	2.2 mm	2.4 mm
M2.5 x 0.45	Coarse	2.05 mm	0.0807	#46	77%	2.7 mm	2.9 mm
M3 x 0.5	Coarse	2.5 mm	0.0984	#40	77%	3.2 mm	3.4 mm
M3.5 x 0.6	Coarse	2.9 mm	0.1142	#33	77%	3.7 mm	3.9 mm
M4 x 0.7	Coarse	3.3 mm	0.1299	#30	77%	4.3 mm	4.5 mm
M5 x 0.8	Coarse	4.2 mm	0.1654	#19	77%	5.3 mm	5.5 mm
M6 x 1	Coarse	5 mm	0.1969	#9	77%	6.4 mm	6.6 mm
M7 x 1	Coarse	6 mm	0.2362	Letter B	77%	7.4 mm	7.6 mm
M8 x 1.25	Coarse	6.8 mm	0.2677	Letter H	74%	8.4 mm	9 mm
M8 x 1	Fine	7 mm	0.2756	Letter J	77%	8.4 mm	9 mm
M10 x 1.5	Coarse	8.5 mm	0.3346	Letter Q	77%	10.5 mm	11 mm
M10 x 1.25	Fine	8.8 mm	0.3465	Letter S	74%	10.5 mm	11 mm
M10 x 1	Fine	9 mm	0.3543	Letter T	77%	10.5 mm	11 mm
M12 x 1.75	Coarse	10.2 mm	0.4016	Letter Y	79%	13 mm	13.5 mm
M12 x 1.5	Fine	10.5 mm	0.4134	Letter Z	77%	13 mm	13.5 mm
M12 x 1.25	Fine	10.8 mm	0.4252	27/64"	74%	13 mm	13.5 mm
M14 x 2	Coarse	12 mm	0.4724	15/32"	77%	15 mm	15.5 mm
M14 x 1.5	Fine	12.5 mm	0.4921	1/2"	77%	15 mm	15.5 mm
M16 x 2	Coarse	14 mm	0.5512	35/64"	77%	17 mm	17.5 mm
M16 x 1.5	Fine	14.5 mm	0.5709	37/64"	77%	17 mm	17.5 mm
M18 x 2.5	Coarse	15.5 mm	0.6102	39/64"	77%	19 mm	20 mm
M18 x 1.5	Fine	16.5 mm	0.6496	21/32"	77%	19 mm	20 mm
M20 x 2.5	Coarse	17.5 mm	0.6890	11/16"	77%	21 mm	22 mm
M20 x 1.5	Fine	18.5 mm	0.7283	47/64"	77%	21 mm	22 mm
M22 x 2.5	Coarse	19.5 mm	0.7677	49/64"	77%	23 mm	24 mm
M22 x 1.5	Fine	20.5 mm	0.8071	13/16"	77%	23 mm	24 mm
M24 x 3	Coarse	21 mm	0.8268	53/64"	77%	25 mm	26 mm
M24 x 2	Fine	22 mm	0.8661	7/8"	77%	25 mm	26 mm

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