Spanner Selection | Central Engineering

Spanner Selection

Spanner Selection Chart (Hex Head Bolt)

Metric
Thread Size	Spanner Size A/F DIN (mm)	Spanner Size A/F ISO (mm)
M1.6	3.2	3.2
M2	4	4
M2.5	5	5
M3	5.5	5.5
M3.5	6	6
M4	7	7
M5	8	8
M6	10	10
M7	11	-
M8	13	13
M10	17	16
M12	19	18
M14	22	21
M16	24	24
M18	27	27
M20	30	30
M22	32	34
M24	36	36
M27	41	41
M30	46	46
M33	50	50
M36	55	55
M39	60	60
M42	65	65
M45	70	70
M48	75	75
M52	80	80
M56	85	85
M60	90	90
M64	95	95
M68	100	-
M72	105	-
M76	110	-
M80	115	-
M90	130	-
M100	145	-
M110	155	-
M125	180	-
M140	200	-
M160	230	-

Inch
Thread Size	Spanner Size A/F ASME (inch)	Spanner Size A/F BS (inch)
1/4	0.438	0.445
5/16	0.500	0.525
3/8	0.562	0.600
7/16	0.625	0.710
1/2	0.750	0.820
9/16	0.812	0.920
5/8	0.938	1.010
3/4	1.125	1.200
7/8	1.312	1.300
1	1.500	1.480
1.1/8	1.688	1.670
1.1/4	1.875	1.860
1.3/8	2.062	2.050
1.1/2	2.250	2.220
1.3/4	2.625	2.580
2	3.000	2.760
2.1/4	3.375	-
2.1/2	3.750	-
2.3/4	4.125	-
3	4.500	-

For detailed information, please refer to complete governing standards.

Note: 1 inch = 25.4 mm