Metric Thread Chart For Metric Bolt Sizes

Published: 11 May 2026

Thread Size	Major Diameter (mm)	Minor Diameter (mm)	Thread Pitch (mm)	Pitch Diameter (mm)	Tapping Drill Diameter (mm)	Clearance Hole Diameter (mm)
M1	1.0	0.729	0.25	0.838	0.75	1.3
M1.1	1.1	0.829	0.25	0.938	0.85	1.4
M1.2	1.2	0.929	0.25	1.038	0.95	1.5
M1.4	1.4	1.075	0.30	1.205	1.10	1.8
M1.6	1.6	1.221	0.35	1.373	1.25	2.0
M1.8	1.8	1.421	0.35	1.573	1.45	2.3
M2	2.0	1.567	0.40	1.740	1.60	2.6
M2.2	2.2	1.713	0.45	1.908	1.75	2.9
M2.5	2.5	2.013	0.45	2.208	2.05	3.1
M3	3.0	2.459	0.50	2.675	2.50	3.6
M3.5	3.5	2.850	0.60	3.110	2.90	4.2
M4	4.0	3.242	0.70	3.545	3.30	4.8
M4.5	4.5	3.688	0.75	4.013	3.80	5.3
M5	5.0	4.134	0.80	4.480	4.20	5.8
M6	6.0	4.917	1.00	5.350	5.00	7.0
M7	7.0	5.917	1.00	6.350	6.00	8.0
M8	8.0	6.647	1.25	7.188	6.80	10.0
M9	9.0	7.647	1.25	8.188	7.80	11.0
M10	10.0	8.376	1.50	9.026	8.50	12.0
M11	11.0	9.376	1.50	10.026	9.50	13.5
M12	12.0	10.106	1.75	10.863	10.20	15.0
M14	14.0	11.835	2.00	12.701	12.00	17.0
M16	16.0	13.835	2.00	14.701	14.00	19.0
M18	18.0	15.394	2.50	16.376	15.50	22.0
M20	20.0	17.294	2.50	18.376	17.50	24.0
M22	22.0	19.294	2.50	20.376	19.50	26.0
M24	24.0	20.752	3.00	22.051	21.00	28.0
M27	27.0	23.752	3.00	25.051	24.00	33.0
M30	30.0	26.211	3.50	27.727	26.50	35.0
M33	33.0	29.211	3.50	30.727	29.50	38
M36	36.0	31.670	4.00	33.402	32.00	41
M39	39.0	34.670	4.00	36.402	35.00	44
M42	42.0	37.129	4.50	39.077	37.50	47
M45	45.0	40.129	4.50	42.077	40.50	50
M48	48.0	42.857	5.00	44.752	43.00	53
M52	52.0	46.587	5.00	48.752	47.00	57
M56	56.0	50.046	5.50	52.428	50.50	61
M60	60.0	54.046	5.50	56.428	54.50	65
M64	64.0	57.505	6.00	60.103	58.00	69
M68	68.0	61.505	6.00	64.103	62.00	73

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