Products
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.
Description
marker
Product definition and structure
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.
Core materials and characteristics
Material: Q235 carbon steel (grade 4.8), 35CrMo alloy steel (grade 8.8, grade 10.9).
Characteristics:
Economical: low cost, strong versatility, suitable for large-scale procurement;
Compatibility: used with standard nuts and washers, good interchangeability;
Standardization: in line with international standards such as ISO 4014 and DIN 931.
Function and applicable scenarios
Function:
General mechanical connection (such as motor, reducer);
Temporary or semi-permanent installation, easy to disassemble.
Scenario:
Household appliances (washing machines, air conditioners), office equipment (table and chair frames), temporary buildings (scaffolding).
Installation and maintenance
Installation:
Use with standard nuts and tighten according to torque requirements (such as the torque value of 4.8-grade bolts refers to GB/T 3098.2);
Avoid direct contact with active metals such as aluminum and magnesium to prevent galvanic corrosion.
Maintenance:
Check the tightness of the nuts regularly, and the damaged parts of the galvanized layer can be treated with anti-rust spray;
It is recommended to choose Class A products (tolerance ±0.1mm) for high-precision equipment.
Purchase suggestions
Select hot-dip galvanized nuts (salt spray test ≥100 hours) for outdoor or humid environments;
Select 35CrMo material for high-temperature environments (>200℃) and match 10.9-grade bolts.
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.
contact us
Related popular products
Electrogalvanized pins
GB/T 882-2008 “Pin” standard, nominal diameter 3-100mm, materials include carbon steel, stainless steel, etc., electrogalvanized layer thickness 5-12μm, in line with c1B or c1A post-treatment requirements.
Welding nut (welding nut)
Welding nut is a nut fixed to the workpiece by welding. Common types include projection welding nut (DIN929) and spot welding nut (DIN2527). Its structure includes threaded section and welding base. The welding base has a boss or plane to enhance the welding strength.
Welding nails
Welding studs are cylindrical head welding studs fixed to the parent material by arc stud welding (standard GB/T 10433), made of SWRCH15A or ML15, with tensile strength ≥400MPa and yield strength ≥320MPa.
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.
Colored zinc-plated expansion bolts
The color zinc passivation process (c2C) is adopted, the coating thickness is 8-15μm, and the corrosion resistance of the salt spray test is more than 72 hours, which has both anti-corrosion and decorative functions.
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.
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.
Electrogalvanized expansion bolts
It consists of countersunk bolts, expansion tubes, flat washers, spring washers and hexagonal nuts. The material is mostly carbon steel (such as Q235), and the thickness of the electrogalvanized layer is 5-12μm, which meets ISO 1461 or GB/T 13912-2002 standards.
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.
Colored 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.
Carriage bolt (half-round head square neck bolt)
The head of the carriage bolt is a large semicircle, and the neck is square to prevent rotation (standard GB/T 14). Common materials are Q235 or stainless steel, with galvanized or blackened surface.
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.
Butterfly bolts
The head of the butterfly bolt is butterfly-shaped, which is easy to tighten manually without tools (standard GB/T 65). Common materials are plastic (POM, PA66) or stainless steel, with natural or electroplated surface.
T-bolt (T-slot bolt)
T-bolt is a bolt with a T-shaped head, used with a T-slot (standard DIN 3015-2), and the flange design increases the contact area and can withstand lateral shear force. Common specifications are M10-M48, thickness 8-20mm, and surface phosphating treatment for corrosion resistance.
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).
Stud bolts
Stud bolts have threads at both ends and a bare rod in the middle, which is used to connect thick plates or penetrate installation (standard GB/T 901). Common materials are 45# steel or 40Cr, with galvanized or blackened surface.
Please leave us a message
-
-
-
WeChat
