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Torsional shear type high strength bolt

GB/T 3632~363 Steel structure adopts high strength torsional shear bolt type Size

Functions: torsional high strength shear type is the advanced large hexagonal high-strength bolt and high strength bolt, belonging to a kind of standard parts. After first tight and end tight construction, it is generally used for permanent connection.

Application: suitable for railway and Highway Bridge, boiler steel structure, industrial buildings, high-rise buildings, tower mast structure, hoisting machinery and other friction type high strength bolt connection.

Thread specifications -d		M16	M20	M22	M24	M27	M30
Screw pitch P		2	2.5	2.5	3	3	3.5
da	max	18.83	24.4	26.4	28.4	32.84	35.84
ds	max	16.43	20.52	22.52	24.52	27.84	30.84
ds	min	15.57	19.48	21.48	23.48	26.16	29.16
dw	min	27.9	34.5	38.5	41.5	42.8	46.5
dk	max	30	37	41	44	50	55
k,	nom	10	13	14	15	17	19
	max	10.75	13.9	14.9	15.9	17.9	20.05
	min	9.25	12.1	13.1	14.1	16.1	17.95
k'	min	12	14	15	16	17	18
k"	max	17	19	21	23	24	25
r	min	1.2	1.2	1.2	1.6	2	2
db	max	11.3	14.1	15.6	16.9	19.3	21.4
db	min	11	13.8	15.3	16.6	18.7	20.8
dc ≈		12.8	16.1	17.8	19.3	21.9	24.4
de ≈		13	17	18	20	22	24

Mechanical behavior:

Grade	Tensile strength	Yield strengthσ0.2	Elongation δ5	Shrinking percentage Ψ
	σь	Mpa	%	%
	Mpa	min
10.9S	1040~1240	940	10	42
8.8S	830~1030	660	12	45

Loading force:

Thread specifications-d		M16	M20	M22	M24	M27	M30
Pressed force section mm²		157	245	303	353	459	561
Pull force KN	10.9S	163~195	255~304	315~376	367~438	477~569	583~696
Pull force KN	8.8S	130~162	203~252	251~312	293~364	381~473	466~578

Materials for steel bolt and nut, flat pad:

Type	Performance level	Thread specifications	Materials
Bolt	10.9S	M12~M24	20MnTiB
	10.9S	M27~M30	35VB
	8.8S	M12~M16	35#
		M20~M24	20MnTiB
		M27~M30	35VB
Nut	8H 10H	M12~M30	35#
Washer	35~45 HRC	12~30	45#

Chemical component:

Materials	C%	Si%	Mn%	Ti%	V%	B%	P%	S%
20MnTiB	0.17~0.24	0.17~0.37	1.30~1.60	0.04~0.10		0.0005~0.0035	≤0.035	≤0.035
35VB	0.31~0.37	0.17~0.37	0.50~0.90		0.05~0.12	0.001~0.004	≤0.04	≤0.04
35#	0.32~0.40	0.17~0.37	0.50~0.80				≤0.035	≤0.035
45#	0.42~0.50	0.17~0.37	0.50~0.80				≤0.035	≤0.035

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Torsional shear type high strength bolt