Hexagon Bolt for Steel Framed Building

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The hexagon bolt is a standard part, also called hexbolt, hex cap screw, hex head cap screw, etc. In construction, it is subject to the initial tightening and final tightening. This threaded fastener is generally used for permanent connection. When applied to steel works, the hexagon bolt is used to connect the joints of steel plates.

GB/T1228 Hexagon Bolt for Steel Structures

Sizes

Thread		M12		M16		M20		M22		M24		M27		M30
Pitch		1.75		2		2.5		2.5		3		3		3.5
c	max	0.8		0.8		0.8		0.8		0.8		0.8		0.8
	min	0.4		0.4		0.4		0.4		0.4		0.4		0.4
da	max	15.23		19.23		24.32		26.32		28.32		32.84		35.84
ds	max	12.43		16.43		20.52		22.52		24.52		27.84		30.4
	min	11.57		15.57		19.48		21.48		23.48		26.16		29.16
dw	min	19.2		24.9		31.4		33.3		38		42.8		46.5
e	min	22.78		59.56		37.29		39.55		45.2		50.85		55.37
k	nominal	7.5		10		12.5		14		15		17		18.7
	max	7.95		10.75		13.4		14.9		15.9		17.9		19.75
	min	7.05		9.25		11.6		13.1		14.1		16.1		17.65
r	min	1		1		1.5		1.5		1.5		2		2
s	max	21		27		34		36		41		46		50
	min	20.16		26.16		33		35		40		45		49
b	L nominal	<45	≥45	<55	≥55	<65	≥65	<70	≥70	<75	≥75	<80	≥80	<85	≥85
	nominal	25	30	30	35	35	40	40	45	45	50	50	55	55	60

Mechanical Properties

Yield Strength σ0.2	Elongation δ5	Shrinkage Ψ
Mpa	%	%
min
940	10	42
660	12	45

Physical Tensile Load

Thread		M12	M16	M20	M22	M24	M27	M30
Stress Area(mm2)		84.3	157	245	303	353	459	561
Tensile Load (KN)	10.9S	87.7 - 104.5	163 - 195	255 - 304	315 - 376	367 - 438	477 - 569	583 - 696
Tensile Load (KN)	8.8S	70.0 - 86.8	130 - 162	203 - 252	251 - 312	293 - 364	381 - 473	466 - 578