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U-bolts
U-bolts are U-shaped with threads at both ends, and are used to fix cylindrical objects such as pipes and plates (standard JB/ZQ 4321). Common specifications are M6-M64, made of carbon steel or stainless steel, with galvanized or blackened surface.
Description
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Product definition and structure
U-bolts are U-shaped with threads at both ends, and are used to fix cylindrical objects such as pipes and plates (standard JB/ZQ 4321). Common specifications are M6-M64, made of carbon steel or stainless steel, with galvanized or blackened surface.
Core materials and features
Material: Q235 carbon steel (conventional), 304/316 stainless steel (corrosion resistant).
Features:
Strong adaptability: The arc can be customized according to the pipe diameter to adapt to pipes of different outer diameters;
Anti-loosening design: Use double nuts or spring washers to enhance vibration resistance;
Lightweight: Stainless steel is lightweight and suitable for high-altitude operations.
Functions and applicable scenarios
Functions:
Fix water pipes, gas pipes, cable trays, etc.;
Connection of automotive leaf springs and suspension systems.
Scenarios:
Municipal engineering (pipeline brackets), automobile manufacturing (chassis components), ship decks (cable fixing).
Installation and maintenance
Installation:
Select the inner diameter of the U-bolt according to the pipe diameter (recommended to be 2-3mm larger than the pipe diameter);
Reserve 2-3 threads after tightening the nut to avoid stress concentration.
Maintenance:
Regularly check the integrity of the galvanized layer in outdoor environments, and apply anti-rust paint to damaged areas;
Avoid contact with chloride ions for stainless steel materials to prevent pitting.
Purchase recommendations
Select 316 stainless steel for highly corrosive environments, and carbon steel + epoxy coating for low-temperature environments;
For heavy-duty scenarios (such as bridge pipelines), it is recommended to choose thickened pipe wall models.
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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Colored zinc-plated nuts
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Electrogalvanized cross countersunk drill thread
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High-strength blackened nuts
High-strength blackened nuts are nuts that form a black Fe₃O₄ oxide film on the surface of alloy steel through chemical oxidation (blackening treatment). The base material is usually 42CrMo or 65 manganese steel. After quenching + tempering treatment, the hardness can reach HRC35-45.
T-bolt (T-slot bolt)
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Electroplated galvanized flange nut (flange face nut)
Electroplated galvanized flange nut is a special nut with a circular flange added to one end of the hexagonal nut. The flange increases the contact area with the connected parts, disperses the pressure and enhances the shear resistance. Its structure includes threaded section, flange and galvanized layer. Some models have anti-slip teeth on the surface of the flange (such as DIN6923 standard).
Electrogalvanized hexagonal bolts
Hexagonal bolts are the most common standard bolts with hexagonal heads and are used with nuts (standard GB/T 5780). Common materials are Q235 or 35CrMo, with galvanized or blackened surfaces.
Colored zinc-plated expansion hook
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Black zinc flange bolts
The head of the flange bolt has a round flange to increase the contact area and disperse the pressure (standard GB/T 5787, GB/T 5789). Common specifications M6-M30, material Q235 or 35CrMo, surface galvanized or blackened.
Colored zinc-plated gaskets
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Basket bolts
The basket bolt consists of an adjustment rod and a nut with left and right thread, which is used to tighten the wire rope or adjust the tension (standard JB/T 5832). Common materials: Q235 or stainless steel, with galvanized or blackened surface.
Electrogalvanized chemical bolts
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Electro-galvanized countersunk cross bolts
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