SG-XXIV: METRIC CLEARANCE HOLE CHART

Metric clearance hole chart for metric bolts and screws according to ASME B18.2.8

M2 Clearance Hole :

Close fit: 2.2 mm, Normal fit: 2.4 mm , Loose fit: 2.6 mm

M3 Clearance Hole :

Close fit: 3.2 mm, Normal fit: 3.4 mm , Loose fit: 3.6 mm

M4 Clearance Hole :

Close fit: 4.3 mm, Normal fit: 4.5 mm , Loose fit: 4.8 mm

M5 Clearance Hole :

Close fit: 5.3 mm, Normal fit: 5.5 mm , Loose fit: 5.8 mm

M6 Clearance Hole :

Close fit: 6.4 mm, Normal fit: 6.6 mm , Loose fit: 7 mm

M8 Clearance Hole :

Close fit: 8.4 mm, Normal fit: 9 mm , Loose fit: 10 mm

M10 Clearance Hole :

Close fit: 10.5 mm, Normal fit: 11 mm , Loose fit: 12 mm

M12 Clearance Hole :

Close fit: 13 mm, Normal fit: 13.5 mm , Loose fit: 14.5 mm

Metric Clearance Holes Chart
Nominal Screw Size	Fit Class - Normal			Fit Class - Close			Fit Class - Loose
	Nominal Drill Size	Hole Diameter		Nominal Drill Size	Hole Diameter		Nominal Drill Size	Hole Diameter
	Nominal Drill Size	Min.	Max.	Nominal Drill Size	Min.	Max.	Nominal Drill Size	Min.	Max.
M1.6	1.8	1.8	1.94	1.7	1.7	1.8	2	2	2.25
M2	2.4	2.4	2.54	2.2	2.2	2.3	2.6	2.6	2.85
M2.5	2.9	2.9	3.04	2.7	2.7	2.8	3.1	3.1	3.4
M3	3.4	3.4	3.58	3.2	3.2	3.32	3.6	3.6	3.9
M4	4.5	4.5	4.68	4.3	4.3	4.42	4.8	4.8	5.1
M5	5.5	5.5	5.68	5.3	5.3	5.42	5.8	5.8	6.1
M6	6.6	6.6	6.82	6.4	6.4	6.55	7	7	7.36
M8	9	9	9.22	8.4	8.4	8.55	10	10	10.36
M10	11	11	11.27	10.5	10.5	10.68	12	12	12.43
Nominal Screw Size	Fit Class - Normal			Fit Class - Close			Fit Class - Loose
	Nominal Drill Size	Hole Diameter		Nominal Drill Size	Hole Diameter		Nominal Drill Size	Hole Diameter
	Nominal Drill Size	Min.	Max.	Nominal Drill Size	Min.	Max.	Nominal Drill Size	Min.	Max.
M12	13.5	13.5	13.77	13	13	13.18	14.5	14.5	14.93
M14	15.5	15.5	15.77	15	15	15.18	16.5	16.5	16.93
M16	17.5	17.5	17.77	17	17	17.18	18.5	18.5	19.02
M20	22	22	22.33	21	21	21.21	24	24	24.52
M24	26	26	26.33	25	25	25.21	28	28	28.52
M30	33	33	33.39	31	31	31.25	35	35	35.62
M36	39	39	39.39	37	37	37.25	42	42	42.62
M42	45	45	45.39	43	43	43.25	48	48	48.62
M48	52	52	52.46	50	50	50.25	56	56	56.74
Nominal Screw Size	Fit Class - Normal			Fit Class - Close			Fit Class - Loose
	Nominal Drill Size	Hole Diameter		Nominal Drill Size	Hole Diameter		Nominal Drill Size	Hole Diameter
	Nominal Drill Size	Min.	Max.	Nominal Drill Size	Min.	Max.	Nominal Drill Size	Min.	Max.
M56	62	62	62.46	58	58	58.3	66	66	66.74
M64	70	70	70.46	66	66	66.3	74	74	74.74
M72	78	78	78.46	74	74	74.3	82	82	82.87
M80	86	86	86.54	82	82	82.35	91	91	91.87
M90	96	96	96.54	93	93	93.35	101	101	101.87
M100	107	107	107.54	104	104	104.35	112	112	112.87