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10.9S Torsion Shear Bolts
10.9S Torsion Shear Bolts are high-strength bolts designed for steel structures. The preload is controlled by twisting off the plum head at the tail (standard GB/T 3632). Each set includes bolts, nuts, and washers, which need to be manufactured in the same batch to ensure the consistency of mechanical properties.
Description
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Product Definition and Core Technology
10.9S Torsion Shear Bolts are high-strength bolts designed for steel structures. The preload is controlled by twisting off the plum head at the tail (standard GB/T 3632). Each set includes bolts, nuts, and washers, which need to be manufactured in the same batch to ensure the consistency of mechanical properties.
Core Materials and Characteristics
Material: 20MnTiB alloy steel, tensile strength ≥1040MPa, yield strength ≥940MPa.
Characteristics:
Self-check function: The twisting off of the plum head indicates that the specified preload has been reached, and no additional testing is required;
Seismic performance: The preload is highly stable and suitable for equipment foundations with frequent vibrations;
Efficient installation: The electric wrench completes the tightening in one go, and the efficiency is twice that of large hexagonal bolts.
Functions and applicable scenarios
Functions:
Fix steel components (such as H-shaped steel beams and columns) to prevent slippage;
Can replace welding and reduce on-site hot work.
Scenarios:
High-rise buildings (steel frame nodes), bridge engineering (box beam splicing), machinery manufacturing (heavy equipment base).
Installation and maintenance
Installation:
Use a special shear wrench to ensure that the torque of the plum head meets the standard (such as the final tightening torque of M20 bolts is 445N・m);
The bolt length needs to reserve 3-5 threads to avoid the plum head not being twisted off.
Maintenance:
It is forbidden to reuse the broken bolts, and the bolt pair needs to be replaced as a whole;
When exposed to a humid environment for a long time, it is recommended to apply an anti-corrosion coating.
Purchase suggestions
Select the wrench model according to the bolt diameter (such as M16-M30 corresponds to different specifications of wrenches);
Preferably choose products with anti-loosening coating to improve long-term stability.
Guide to Comparing and Selecting Sixteen Major Bolts
| Type | 10.9S large hexagonal bolt | 10.9S shear bolt | T-bolt | U-bolt | Countersunk cross bolt | Butterfly bolt | Flange bolt | Welding nail bolt | Basket bolt | Chemical bolt | Hexagonal bolt series | Carriage bolt | Hexagonal electroplated zinc | Hexagonal colored zinc | Hexagon socket bolt series | Stud bolt |
| Core advantages | Ultra-high strength, friction force transmission | Self-checking, earthquake resistance | Quick installation | Strong adaptability | Beautiful concealed, insulation | Manual convenience | High sealing | High connection strength | Tension adjustment | No expansion stress | Economical and universal | Anti-rotation and anti-theft | Basic anti-corrosion | High corrosion resistance | Beautiful anti-corrosion | High tensile strength |
| Salt spray test | 1000 hours (Dacromet) | 72 hours (galvanized) | 48 hours | 72 hours | 24 hours (galvanized) | 48 hours | 72 hours | 48 hours | 72 hours | 20 years | 24-72 hours | 72 hours | 24-72 hours | 72-120 hours | 48 hours | 48 hours |
| Applicable temperature | -40℃~600℃ | -20℃~200℃ | -20℃~80℃ | -20℃~100℃ | -20℃~100℃ | -20℃~95℃ | -20℃~200℃ | -20℃~200℃ | -20℃~150℃ | -40℃~80℃ | -20℃~80℃ | -20℃~80℃ | -20℃~80℃ | -20℃~100℃ | -20℃~100℃ | -20℃~200℃ |
| Typical scenarios | Steel structures, bridges | High-rise buildings, machinery | T-slots | Pipe fixings | Furniture, electronic equipment | Home appliances, cabinets | Pipe flanges | Steel-concrete connections | Cable wind ropes | Building reinforcement | General machinery, indoor | Wooden structures | General machinery | Outdoor equipment | Precision equipment | Thick plate connection |
| Installation method | Torque wrench | Torque shear wrench | Manual | Nut tightening | Screwdriver | Manual | Torque wrench | Arc welding | Manual adjustment | Chemical anchoring | Torque wrench | Tapping + nut | Torque wrench | Torque wrench | Torque wrench | Nut tightening |
| Environmental protection | Chrome-free Dacromet RoHS compliant | Galvanized RoHS compliant | Phosphating | Galvanized | Plastic RoHS compliant | Plastic RoHS compliant | Galvanized | Heavy metal-free | Galvanized | Solvent-free | Cyanide-free zinc plating RoHS compliant | Galvanized | Cyanide-free zinc plating | Trivalent chromium passivation | Phosphating | No hydrogen embrittlement |
Selection suggestions:
Ultra-high strength requirements: 10.9S large hexagonal bolts, matching steel structure friction type connection;
Seismic and anti-loosening: torsion shear bolts, suitable for equipment foundations with frequent vibrations;
T-slot installation: T-bolts, quick position adjustment;
Pipeline fixing: U-bolts, suitable for different pipe diameters;
Surface flatness requirements: countersunk cross bolts, beautiful and hidden;
Manual tightening: butterfly bolts, no tools required;
High sealing: flange bolts, with gaskets to enhance sealing;
Steel-concrete connection: welding nails, efficient welding;
Tension adjustment: basket bolts, precise control of wire rope tension;
Post-anchoring engineering: chemical bolts, no expansion stress;
General connection: hexagonal bolt series, the first choice for economy;
Wooden structure: carriage bolts, anti-rotation and anti-theft;
Anti-corrosion requirements: hexagonal galvanized bolts, the first choice for outdoor use;
Thick plate connection: stud bolts, suitable for different installation spaces.
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