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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).
Description
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Product definition and structure
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).
Core materials and characteristics
Material: Q235 carbon steel (conventional), 45# steel (high strength), surface electroplated zinc (thickness 5-15μm), salt spray test 24-72 hours without white rust, special sealing process can be extended to more than 200 hours.
Features:
High stability: The flange design reduces stress concentration and is suitable for connection scenarios with large bolt holes (such as pipe flanges);
Anti-loosening performance: The toothed model embeds the surface of the connected parts through the teeth to enhance the friction anti-loosening ability;
Standardization: Complies with GB/T 6177.1, DIN6923 and other standards, with optional specifications from M5 to M20.
Function and applicable scenarios
Function:
Fixed pipes, pressure vessels, mechanical flanges and other connections that require high sealing;
Replace the flat washer + nut combination to simplify the installation process.
Scenario:
Chemical pipelines (such as oil cracking equipment), building steel structures (such as H-shaped steel nodes), automobile chassis (such as suspension systems).
Installation and maintenance
Installation:
Clean the surface of the connected parts to ensure that the flange fits the contact surface;
Tighten with a torque wrench according to the torque standard (such as 8.8 grade bolts refer to ISO 898-2) to avoid over-tightening and damage to the coating.
Maintenance: Check the flange edge regularly for deformation, and reapply zinc-rich paint to damaged galvanized layers.
Purchase recommendations
Choose materials based on load: Q235 is suitable for static loads, and 45# steel is suitable for vibration environments;
For high corrosion scenarios, thickened galvanized layers (12-15μm) or hot-dip galvanizing processes are preferred.
Comparison and selection guide of the six major nuts
| Type | Electroplated galvanized flange nut | Electroplated galvanized nut | Colored zinc-plated nut | Anti-loosening nut | High-strength blackened nut | Welding nut |
| Core advantages | Dispersed pressure, anti-loosening | Low cost, strong versatility | High corrosion resistance, color identification | Anti-vibration, removable | High strength, high temperature resistance | Permanent connection, convenient |
| Salt spray test | 24-72 hours | 24-72 hours | 72-120 hours | 48 hours (nylon) | 48 hours without red rust | 48 hours (galvanized) |
| Applicable temperature | -20℃~80℃ | -20℃~80℃ | -20℃~100℃ | -56℃~170℃ (all metal) | -40℃~200℃ | -20℃~200℃ |
| Typical scenarios | Pipe flange, steel structure | General machinery, indoor environment | Outdoor equipment, humid environment | Engine, vibration equipment | High temperature machinery, vibration equipment | Automobile manufacturing, construction machinery |
| Installation method | Torque wrench tightening | Torque wrench tightening | Torque wrench tightening | Torque wrench tightening | Torque wrench tightening | Welding fixation |
| Environmental protection | Cyanide-free process complies with RoHS | Cyanide-free process complies with RoHS | Trivalent chromium is more environmentally friendly | Nylon complies with RoHS | No heavy metal pollution | No special requirements |
Selection suggestions:
High sealing requirements: electroplated zinc flange nut, with gasket to enhance sealing;
High corrosion environment: color-plated zinc nut, chromium-free passivation process is preferred;
Vibration environment: anti-loosening nut, all-metal type is suitable for high temperature scenes;
High temperature and high load: high-strength blackened nut, matched with 10.9 grade bolts;
Permanent connection: welding nut, projection welding or spot welding type is selected according to the process.
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