Structural & Tower Bolts

Torshear Structural Bolts

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Standard / drawing type Nominal size d

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Equivalent standards

Standard	Standard body

Technical conditions and referenced standards


Category	Nut	Nut
Property class	10H	10H
Recommended materials	35, 45	ML35
Standard designation	GB/T 699	GB/T 6478
Applicable sizes	≤M30	≤M30
Thread	The basic thread dimensions shall comply with GB/T 196 for coarse-pitch metric threads ; Nut threads shall conform to tolerance class 6H ( GB/T 197).	The basic thread dimensions shall comply with GB/T 196 for coarse-pitch metric threads ; Nut threads shall conform to tolerance class 6H ( GB/T 197).
Surface treatment	To achieve the required assembly preload and corrosion resistance, the bolts, nuts and washers shall be surface-treated. The treatments may be the same or different and shall be selected by the manufacturer. After treatment, the assembly preload shall conform to Table 12.	To achieve the required assembly preload and corrosion resistance, the bolts, nuts and washers shall be surface-treated. The treatments may be the same or different and shall be selected by the manufacturer. After treatment, the assembly preload shall conform to Table 12.
Surface discontinuities	GB/T 5779.1, GB/T 5779.2	GB/T 5779.1, GB/T 5779.2


Category	Washer
Property class	–
Recommended materials	35, 45
Standard designation	GB/T 699
Applicable sizes	≤M30
Thread	–
Surface treatment	To achieve the required assembly preload and corrosion resistance, the bolts, nuts and washers shall be surface-treated. The treatments may be the same or different and shall be selected by the manufacturer. After treatment, the assembly preload shall conform to Table 12.
Surface discontinuities	Washer surfaces shall be free of cracks, burrs, superficial rust and any dents or scratches that impair use.


Category	Bolt	Bolt	Bolt	Bolt
Property class	10.9S	10.9S	10.9S	10.9S
Recommended materials	20MnTiB	ML20MnTiB	35VB	35CrMo
Standard designation	GB/T 3077	GB/T 6478	Annex A	GB/T 3077
Applicable sizes	≤M24	≤M24	M27, M30	M27, M30
Thread	The basic thread dimensions shall comply with GB/T 196 for coarse-pitch metric threads ; Bolt threads shall conform to tolerance class 6g (GB/T 197).	The basic thread dimensions shall comply with GB/T 196 for coarse-pitch metric threads ; Bolt threads shall conform to tolerance class 6g (GB/T 197).	The basic thread dimensions shall comply with GB/T 196 for coarse-pitch metric threads ; Bolt threads shall conform to tolerance class 6g (GB/T 197).	The basic thread dimensions shall comply with GB/T 196 for coarse-pitch metric threads ; Bolt threads shall conform to tolerance class 6g (GB/T 197).
Surface treatment	To achieve the required assembly preload and corrosion resistance, the bolts, nuts and washers shall be surface-treated. The treatments may be the same or different and shall be selected by the manufacturer. After treatment, the assembly preload shall conform to Table 12.	To achieve the required assembly preload and corrosion resistance, the bolts, nuts and washers shall be surface-treated. The treatments may be the same or different and shall be selected by the manufacturer. After treatment, the assembly preload shall conform to Table 12.	To achieve the required assembly preload and corrosion resistance, the bolts, nuts and washers shall be surface-treated. The treatments may be the same or different and shall be selected by the manufacturer. After treatment, the assembly preload shall conform to Table 12.	To achieve the required assembly preload and corrosion resistance, the bolts, nuts and washers shall be surface-treated. The treatments may be the same or different and shall be selected by the manufacturer. After treatment, the assembly preload shall conform to Table 12.
Surface discontinuities	GB/T 5779.1, GB/T 5779.2	GB/T 5779.1, GB/T 5779.2	GB/T 5779.1, GB/T 5779.2	GB/T 5779.1, GB/T 5779.2

Product overview

The bolt component of a torshear structural bolting assembly. This drawing covers the bolt; confirm matching nuts, washers and project requirements for the complete assembly.

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Torshear Structural Bolts

GB/T 3632-2008 dimension drawing

Specification parameters

Equivalent standards

Technical conditions and referenced standards

Product overview