Hex / Heavy Hex Bolts

High Strength Bolts with Large Hexagon Head for Steel Structures  

Grade of Property			Thread Size**		Material***		Tensile Strength Rbmin(Mpa)			Hardness (HRC)		Elongation Ratio(δ%)			Reduction of Area(ψ%)
10.9			M12～M36		40Cr		1040			32～39		9			48
Tread Size		M12		M16		M20		M22		M24		M27		M30		M36
c	min.	0.4		0.4		0.4		0.4		0.4		0.4		0.4		0.4
	max.	0.6		0.6		0.8		0.8		0.8		0.8		0.8		0.8
dw	min.	20		25		30		34		39		43.5		47.5		57
e	min.	23.91		29.56		35.03		39.55		45.20		50.85		55.37		66.44
k		8		10		13		14		15		17		19		23
s	max.	22		27		32		36		41		46		50		60
	min.	21.16		26.16		31.00		35.00		40.00		45.00		49.00		58.80
b	L	≤70	≥75	≤70	≥75	≤85	≥90	≤85	≥90	≤85	≥90	≤95	≥100	≤95	≥100	≤100	≥105
	Nominal	21	23	26	28	31	33	32	34	34	37	37	39	40	42	48	50

Thread Size		M12	M16	M20	M22	M24	M27	M30
b(Reference)		19.5	23	26	28	29.5	32.5	35
e	min.	20.88	26.17	32.95	35.03	39.55	45.20	50.85
k		8	10	13	14	15	17	19
m		10	13	16	18	19	22	24
s		19	24	30	32	36	41	46
d2	max.	18.48	23.16	29.16	31	35	40	45
	min.	13	17	21	23	25	28	31