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Nominal yield strength f_yb and ultimate tensile strength f_ub according to EN1993-1-8 Table 3.1

Bolt class	4.6	4.8	5.6	5.8	6.8	8.8	10.9
fyb (MPa)	240	320	300	400	480	640	900
fub (MPa)	400	400	500	500	600	800	1000

Nominal values for strength follow a simple mnemonic:

If bolt class is X.Y then f_yb = X * Y * 10 and f_ub = X * 100.

Y is the ratio f_yb / f_ub .

Main properties of metric hexagonal bolts

Size	Nominal diameter d mm	Width across flats s mm	Gross area Ag mm2	Stress area As mm2
M8	8	13	50.3	36.6
M10	10	16	78.5	58.0
M12	12	18	113	84.3
M14	14	21	154	115
M16	16	24	101	157
M18	18	27	254	192
M20	20	30	314	245
M22	22	34	380	303
M24	24	36	452	353
M27	27	41	573	459
M30	30	46	707	561
M33	33	50	855	694
M36	36	55	1020	817
M39	39	60	1190	976

Nominal clearances for bolts and pins according to EN1090-2

Size	Normal round holes mm a	Oversize round holes mm	Short slotted holes (on the length) mm d	Long slotted holes (on the length) (1.5d) mm d
M12	1b,c	3	4	18
M14	1b,c	3	4	21
M16	2	4	6	24
M18	2	4	6	27
M20	2	4	6	30
M22	2	4	6	33
M24	2	6	8	36
M27	3	8	10	40.5
M30	3	8	10	45
M33	3	8	10	49.5
M36	3	8	10	54
M39	3	8	10	97.5

Notes:

a) For applications such as towers and masts the nominal clearance for normal round holes shall be reduced by 0,5 mm unless otherwise specified

b) For coated fasteners, 1 mm nominal clearance can be increased by the coating thickness of the fastener.

c) Bolts with nominal diameter 12 and 14 mm, or countersunk bolts may also be used in 2 mm clearance holes under conditions
given in EN 1993-1-8.

d)For bolts in slotted holes the nominal clearances across the width shall be the same as the clearances on diameter specified
for normal round holes.