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Products
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.
Description
marker
Product definition and structure
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.
Core materials and characteristics
Material: Q235 carbon steel (conventional), 35CrMo alloy steel (high strength).
Features:
High sealing: The flange with gasket can enhance the sealing of the pipeline connection;
Shear resistance: The flange design reduces the shear load on the bolt and is suitable for vibration environments;
Standardization: Complies with international standards such as DIN 6921 and ISO 4014.
Functions and applicable scenarios
Function:
Fixed pipe flanges, pressure vessel interfaces and other connections that require high sealing;
Replace flat gasket + bolt combination to simplify installation.
Scenarios:
Chemical pipelines (such as oil cracking equipment), building steel structures (H-shaped steel nodes), automobile engines (cylinder connections).
Installation and maintenance
Installation:
Clean the flange surface to ensure that the gasket fits the flange;
Tighten symmetrically 2-3 times according to the torque standard (such as 8.8-grade bolts refer to ISO 898-2).
Maintenance:
Check the tightness of the flange bolts regularly, and re-tighten them in high temperature environments (>100℃);
Select hot-dip galvanizing or Dacromet treatment in corrosive environments.
Purchase recommendations
Select the coating according to the corrosiveness of the medium: galvanizing for indoor use and hot-dip galvanizing for outdoor use;
Select 35CrMo material for high-pressure pipelines, matching 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.
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Related popular products
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 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.
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.
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.
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.
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.
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.
7-shaped anchors (7-shaped anchor bolts)
The 7-shaped anchor is named because one end of the bolt is bent in a “7” shape. It is one of the most basic types of anchor bolts. Its structure includes a threaded rod body and an L-shaped hook. The hook part is buried in the concrete foundation and connected to the equipment or steel structure through a nut to achieve a stable fixation.
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.
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.
Electroplated galvanized gaskets
Electroplated galvanized gaskets are gaskets that deposit a zinc layer on the surface of carbon steel or alloy steel through an electrolytic process. The thickness of the zinc layer is usually 5-15μm. Its surface is silvery white or bluish white, and it has both anti-corrosion and decorative functions. It is one of the most commonly used surface treatment methods in the industrial field.
Black zinc plated hinge bolts
Swivel Bolt Series Structural Features • Basic Structure: Typically consists of a screw, a nut, a...
Colored zinc plated 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.
High-strength blackened gasket
High-strength blackened gasket is a gasket that forms a black Fe₃O₄ oxide film on the surface of alloy steel through chemical oxidation (blackening treatment), with a film thickness of about 0.5-1.5μm. Its base material is usually 65 manganese steel or 42CrMo alloy steel, and after quenching + tempering treatment, the hardness can reach HRC35-45.
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.
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