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10.9S large hexagon bolts
10.9S large hexagon bolts are the core components of high-strength friction-type connections. They are composed of bolts, nuts, and double washers (standard GB/T 1228). The tensile strength reaches 1000MPa and the yield strength is 900MPa. Its surface treatment adopts Dacromet or multi-alloy co-penetration technology, and the salt spray test exceeds 1000 hours. It is suitable for extreme environments such as oceans and high temperatures.
Description
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Product definition and core technology
10.9S large hexagon bolts are the core components of high-strength friction-type connections. They are composed of bolts, nuts, and double washers (standard GB/T 1228). The tensile strength reaches 1000MPa and the yield strength is 900MPa. Its surface treatment adopts Dacromet or multi-alloy co-penetration technology, and the salt spray test exceeds 1000 hours. It is suitable for extreme environments such as oceans and high temperatures.
Core materials and characteristics
Material: 20MnTiB, 35VB alloy steel, quenched + tempered, hardness HRC35-45.
Characteristics:
Ultra-high strength: Meets the seismic design requirements of steel structures, and can withstand extreme loads such as bridges and high-rise buildings;
Friction transmission: Preload is used to generate friction resistance between the connecting plates to avoid slippage, and the safety is better than that of pressure-bearing connections;
Anti-corrosion performance: Dacromet treatment has no risk of hydrogen embrittlement, the hardness of the multi-alloy co-diffusion layer is HV400, and it is resistant to high temperatures of 600℃.
Functions and applicable scenarios
Functions:
Disperse loads, enhance node rigidity, and are suitable for full or partial penetration steel frame connections;
Reusable, and can be used again after disassembly inspection without damage.
Scenarios:
Bridge engineering (such as cable-stayed bridge tower connection), industrial plant (steel truss node), wind power equipment (tower flange).
Installation and maintenance
Installation:
Use a torque wrench to tighten according to the torque coefficient of 0.11-0.15, and the initial tightening torque is 50% of the final tightening torque;
Use special washers (GB/T 1230) to ensure that the preload is evenly distributed.
Maintenance:
Check the torque attenuation of the bolt pair regularly, and consider the influence of thermal expansion and contraction in areas with large temperature differences;
The damaged parts of the Dacromet coating can be repaired with chromium-free zinc-aluminum paint.
Purchase suggestions
For high temperature environments (>300℃), choose multi-element alloy co-penetration treatment, and for low temperature environments, choose Dacromet process;
Prioritize environmentally friendly products that have passed ISO 14001 certification.
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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