10.9S Shear Bolts: Factory to Site, Anywhere in the World.

2026-01-09

10.9 S grade steel structure torsion shear bolt product introduction

1. Product overview 10.9 S grade steel structure torsion shear bolt is a high-strength fastener, which belongs to the steel structure friction type high-strength bolted connection pair, mainly used for the connection and fixation of steel structure engineering. This product complies with the GB/T3632 national standard, has excellent mechanical properties and corrosion resistance, and is an indispensable key connector in modern steel structure engineering.

2. Performance level and material Performance level: 10.9S grade means that the tensile strength of the bolt reaches 1000MPa, the yield strength is 900MPa, and the yield ratio is 0.9. The number before the decimal point indicates the tensile strength after heat treatment, and the number after the decimal point indicates the yield-strength ratio. Material requirements: Manufactured of high-strength alloy steel, mainly including 20MnTiB (manganese-titanium-boron steel), 35VB (vanadium-boron steel) and other materials. Through the dual heat treatment process of quenching + tempering, the microstructure of the bolt is uniform and the mechanical properties are stable and up to standard.
3. Product specifications Thread specifications: M16, M20, M22, M24, M27, M30 (M22, M27 are two choice series, under normal circumstances M16, M20, M24, M30 is mainly selected) Length range: 50mm-250mm (common specifications include M16×50-80, M20×50-80, M22×50-80, M24×60-90, etc.) Surface treatment: oxidized blackening, phosphating, galvanizing, dacromet, etc., The appropriate surface treatment method can be selected according to the use environment.
4. Structural characteristics Composition structure: Each connecting pair includes a high-strength torsion shear bolt, a high-strength nut, and two high-strength washers, all of which are the same batch of products and processed by the same heat treatment process. Design features: The bolt head is semicircular, the tail has a torx head and a ring groove to control the tightening torque. This design allows the bolt to be installed by unscrewing the torx head to precisely control the preload, ensuring construction quality.

5. Application areas 10.9S grade steel structure torsion shear bolts are widely used in: • Super high-rise buildings, long-span stadiums, exhibition centers • Power plants, petrochemical plant facilities, industrial plants • Railway bridges, highway bridges, pipeline bridges • Tower mast structures, boiler frames, lifting machinery • High-rise civil buildings, various towers, light steel structures 6. Construction process Installation tools: must use a special torsion shear electric wrench for installation, the initial screwing can use an impact electric wrench or a constant torque wrench, and the final screw must use a torsion shear wrench. Construction process:

1.Initial screwing: apply 50%-70% of the final screwing torque to eliminate the gap between the plate layer

2.Final screwing: Use a twist wrench to continue to tighten until the torx head breaks

3.Quality inspection: Visual inspection of neck broken traces, no need for secondary torque testing Construction points: • The friction surface needs to be sandblasted or shot blasted to meet the Sa2.5 standard • When connecting the sub-assembly, the side of the nut with round table should face the side with the chamfer of the washer • The screwing sequence should radiate from the center of the node to the surrounding area 7. Quality inspection acceptance standards: •1. Exposed thread length 2-3 turns • Neck break area should be flat without cracks • Friction surface slip resistance coefficient ≥0.45 (sandblasted surface) • Fracture rate of hexagon socket head should meet specification requirements Prohibited situations: • In humid or corrosive environments, use with weather-resistant coating • In long-term dynamic load conditions, regularly check for preload loss • After hexagon socket head fracture, bolts must not be reused VIII. Technical Advantages

1.High strength performance: tensile strength 1000MPa, yield strength 900MPa, capable of withstanding high preload and shear forces

2.Easy installation: preload can be visually verified by hexagon socket head fracture, improving construction efficiency 3. Controllable quality: installation quality is not affected by tools or human factors, ensuring stable and reliable quality

3.Fatigue resistance: high preload combined with friction-type connection significantly reduces stress amplitude under dynamic load 5. Cost-effectiveness: although the unit price is 15%-20% higher than ordinary bolts, construction efficiency increases by 30%, reducing overall project cost IX. Precautions

4.Installation temperature must not be below -10℃; take moisture protection measures in high humidity

5.Work should be stopped during rain to prevent moisture on friction surfaces

6.Take protective measures after friction surface treatment to prevent contamination by dirt and oil

7.No markings are allowed on the friction surfaces of high-strength bolt connections 5. Must not be reused; design should reserve 5% spare quantity The 10.9S grade steel structure torsional shear bolt, with its advantages of high strength, ease of installation, and controllable quality, has become a core connector in modern steel structure projects and is widely used in various large-scale steel structure projects.