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Hot-dip galvanized chemical bolts
Chemical bolts fix the screw in a substrate such as concrete through a chemical anchoring agent, and are composed of a screw, a hose, and a washer (standard GB 50367). Common materials are galvanized steel or stainless steel, and the anchoring depth is ≥8d (d is the bolt diameter).
Description
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Product definition and core technology
Chemical bolts fix the screw in a substrate such as concrete through a chemical anchoring agent, and are composed of a screw, a hose, and a washer (standard GB 50367). Common materials are galvanized steel or stainless steel, and the anchoring depth is ≥8d (d is the bolt diameter).
Core materials and characteristics
Material: Q235 galvanized steel (conventional), 304 stainless steel (corrosion-resistant).
Features:
High bearing capacity: pull-out force can reach more than 100kN, suitable for heavy-load anchoring;
No expansion stress: chemical bonding avoids cracking of the substrate, suitable for sensitive structures;
Weather resistance: the anchor is acid and alkali resistant, low temperature resistant (-40℃), and has a service life of more than 20 years.
Functions and applicable scenarios
Functions:
Fix steel structures, curtain wall brackets, equipment foundations, etc.;
Replace embedded parts, suitable for post-anchoring renovation projects.
Scenario:
Building reinforcement (beam-column nodes), bridge maintenance (support replacement), mechanical installation (heavy equipment base).
Installation and maintenance
Installation:
Clear the hole with high-pressure air after drilling to ensure that there is no dust;
Insert the hose, screw the bolt to the bottom of the hole, and wait for curing (about 30 minutes at room temperature).
Maintenance:
Avoid welding in the anchoring area to prevent high temperature from damaging the adhesive;
Long-term immersion environment requires sealing to prevent the anchor from failing.
Purchase suggestions
Choose anchoring agent according to substrate strength: C30 concrete uses Class A glue, C20 concrete uses Class B glue;
Areas with seismic fortification intensity ≥8 degrees need to choose products that have passed seismic 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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