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Products
Hexagon socket colored zinc-plated bolts
The hexagon socket bolt head has a hexagon socket hole and needs to be tightened with a hexagon socket wrench (standard GB/T 70.1). Common materials are 35CrMo or 42CrMo, and the surface treatment is divided into three types: electrogalvanized, color zinc-plated, and black zinc-plated.
Description
marker
Product definition and structure
The hexagon socket bolt head has a hexagon socket hole and needs to be tightened with a hexagon socket wrench (standard GB/T 70.1). Common materials are 35CrMo or 42CrMo, and the surface treatment is divided into three types: electrogalvanized, color zinc-plated, and black zinc-plated.
Core materials and characteristics
Material: 35CrMo alloy steel (grade 8.8), 42CrMo alloy steel (grade 10.9).
Characteristics:
High strength: tensile strength ≥800MPa, suitable for high load scenarios;
Anti-corrosion performance:
Electro-galvanizing: no white rust in 24-72 hours of salt spray test, suitable for indoor use;
Colored zinc plating: no white rust in 72-120 hours of salt spray test, suitable for outdoor use;
Black zinc plating: no red rust in 48 hours of salt spray test, both beautiful and anti-corrosion.
Surface hardness: The hardness of the colored zinc plating layer is HV200-300, and the wear resistance is better than that of electro-galvanizing.
Functions and applicable scenarios
Functions:
Fix precision equipment (such as machine tool spindles), automobile engine parts;
Replace hexagonal bolts to save installation space.
Scenario:
Mechanical manufacturing (reducer gearbox), automobile maintenance (engine cylinder head), electronic equipment (heat sink fixing).
Installation and maintenance
Installation:
Use a torque wrench to tighten according to the standard torque (such as the torque value of 10.9 grade bolts refers to GB/T 3098.1);
Avoid zinc-plated bolts from contact with aluminum and magnesium to prevent galvanic corrosion.
Maintenance:
Regularly apply anti-rust oil to electroplated galvanized bolts, and wipe zinc-plated bolts with neutral detergent;
Use zinc-plated with caution in high-temperature environments (>200℃), as the passivation film may decompose.
Purchase suggestions
Choose zinc-plated for highly corrosive environments, and black zinc-plated for indoor precision equipment;
Use stainless steel hexagon socket bolts for high-temperature scenes (>300℃).
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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Related popular products
Colored zinc-plated expansion hook
Rainbow chromate passivation (c2C) is performed on the basis of electrogalvanizing to form a colored passivation film with a thickness of about 8-15μm. The salt spray test can last for more than 72 hours without white rust.
Hot-dip galvanized 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.
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.
Electrogalvanized embedded plate
Q235 or Q355 carbon steel, the thickness of the steel plate is usually 6-50mm, the diameter of the anchor bar is 8-25mm, in line with GB/T 700 or GB/T 1591 standards.
Colored zinc plated countersunk cross bolts
The head of the countersunk cross bolt is conical and can be completely embedded in the surface of the connected parts to maintain a smooth appearance (standard GB/T 68). Common materials are carbon steel, stainless steel or engineering plastics (such as nylon 66), with galvanized or natural color treatment on the surface.
Hexagon socket black zinc-plated bolts
The hexagon socket bolt head has a hexagon socket hole and needs to be tightened with a hexagon socket wrench (standard GB/T 70.1). Common materials are 35CrMo or 42CrMo, and the surface treatment is divided into three types: electrogalvanized, color zinc-plated, and black zinc-plated.
Hexagon socket electrogalvanized bolts
The hexagon socket bolt head has a hexagon socket hole and needs to be tightened with a hexagon socket wrench (standard GB/T 70.1). Common materials are 35CrMo or 42CrMo, and the surface treatment is divided into three types: electrogalvanized, color zinc-plated, and black zinc-plated.
Hexagon socket hot-dip galvanized bolts
The hexagon socket bolt head has a hexagon socket hole and needs to be tightened with a hexagon socket wrench (standard GB/T 70.1). Common materials are 35CrMo or 42CrMo, and the surface treatment is divided into three types: electrogalvanized, color zinc-plated, and black zinc-plated.
Electrogalvanized nuts
Electrogalvanized nuts are the most common standard nuts. A zinc layer is deposited on the surface of carbon steel through an electrolytic process. The surface is silvery white or bluish white, and has both anti-corrosion and decorative functions. Its structure includes a hexagonal head, a threaded section, and a galvanized layer, which complies with GB/T 6170 and other standards.
Electro-galvanized countersunk cross bolts
The head of the countersunk cross bolt is conical and can be completely embedded in the surface of the connected parts to maintain a smooth appearance (standard GB/T 68). Common materials are carbon steel, stainless steel or engineering plastics (such as nylon 66), with galvanized or natural color treatment on the surface.
Black zinc-plated hexagonal drill tail wire
Through the black passivation liquid treatment containing silver salt (c2D), a 10-15μm coating is formed, and the salt spray test is more than 96 hours. Environmentally friendly black zinc plating uses trivalent chromium passivation, does not contain hexavalent chromium, and complies with RoHS standards.
Welded plate anchor (welded plate anchor bolt)
The welded plate anchor consists of a threaded rod, a welded pad and a stiffening rib. The pad is fixed with bolts by welding to form an integrated structure of “bolt + pad”. The pad increases the contact area with the concrete, disperses the load and improves stability.
Black zinc plated hinge bolts
Swivel Bolt Series Structural Features • Basic Structure: Typically consists of a screw, a nut, a...
Umbrella handle anchor (J-type anchor bolt/umbrella handle embedded bolt)
The umbrella handle anchor is named because the end of the bolt is a J-shaped hook (similar to the umbrella handle). It consists of a threaded rod and a J-shaped hook. The hook part is completely embedded in the concrete to provide pull-out resistance.
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 nuts
Colored zinc-plated nuts are passivated on the basis of electrogalvanizing to form a rainbow-colored passivation film (containing trivalent chromium or hexavalent chromium) with a film thickness of about 0.5-1μm. Its anti-corrosion performance is significantly better than ordinary electrogalvanizing, and the surface color is bright, with both functionality and decorativeness.
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Rainbow Inc.
Attn: Katherine Tan
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Statement Updates
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Date.
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