Galvanized Carbon Steel Serrated Hex Flange Anti-Loosening Bolt

The galvanized carbon steel serrated hex flange anti-loosening bolt is an integrated fastener combining a hexagonal drive head, one-piece flange and anti-slip serrations on the flange bottom. Constructed from high-strength carbon steel and finished with electro-galvanizing or hot-dip galvanizing, it cancels separate flat washers for streamlined assembly. The serrated profile on the flange contact face bites firmly into mounting substrates under torque load to realize mechanical anti-loosening and anti-slip locking, solving bolt loosening risks caused by long-term mechanical vibration.

Key Structural Breakdown

1. Hexagonal Drive Head: Matches standard socket and open-end wrenches for stable torque fastening during installation.
2. Integrated Serrated Flange: Replaces loose washers; circumferential serrations bite into metal plates to increase friction resistance and prevent rotational loosening under vibration.
3. Carbon Steel Shank: Available in 4.8 and 8.8 tensile strength grades for static and dynamic load-bearing requirements.
4. Full/Partial Metric Thread: Standard coarse/fine thread for reliable clamping connection.
5. Zinc Plating Coating: Electro-galvanized (yellow zinc / white zinc) or hot-dip galvanized finish blocks moisture and oxygen to resist outdoor rust and thread seizure.

Core Functional Advantages

1. Vibration-Resistant Anti-Loosening Performance

Different from ordinary hex flange bolts that only rely on planar friction for fastening, the serrated structure creates physical occlusion with the workpiece surface after tightening. It maintains stable clamping force for vibrating equipment such as commercial vehicle chassis and photovoltaic brackets to avoid bolt dropping or loosening.

2. Simplified On-Site Assembly

The bolt and flange washer are integrated into a single component. Operators skip washer placement during installation, cutting assembly time, reducing small part loss and improving overall production and construction efficiency.

3. Long-Term Outdoor Anti-Corrosion Capacity

The zinc coating effectively isolates carbon steel from rain, road salt, coastal salt mist and humid workshop air. It prevents rust formation on bolt bodies and threads to guarantee easy disassembly during later maintenance.

4. Uniform Pressure Distribution

The widened flange disperses tightening pressure evenly across contact surfaces, preventing indentation and deformation of thin steel sheets, aluminum profiles and lightweight metal plates during fastening.

Typical Application Scenarios

• Photovoltaic solar panel mounting brackets and outdoor power support frames
• Heavy-duty truck, trailer and agricultural machinery chassis connection points
• Highway guardrails, steel structure workshops and municipal traffic infrastructure
• Generator sets, water pumps and outdoor industrial equipment frames
• Electrical cabinet shells, containers and sheet metal assembly

Product Technical Specification Table

Parameter	Available Specifications
Base Material	Grade 4.8 / Grade 8.8 Carbon Steel
Surface Treatment	Electro-galvanized (White Zinc, Yellow Zinc), Hot-Dip Galvanized
Anti-Loosening Structure	Full serrated flange / Local serrated flange
Thread Standard	DIN6921, DIN933, GB Metric Thread
Regular Sizes	M6, M8, M10, M12, M14, M16, M20
Locking Feature	Vibration-resistant serrated anti-slip flange

Comparison: Serrated Flange Anti-Loosening Bolt vs Ordinary Hex Flange Bolt

1. Ordinary hex flange bolt: Relies merely on planar friction for locking; prone to loosening under continuous mechanical vibration, only suitable for static fixed connections.
2. Serrated hex flange anti-loosening bolt: Combines high friction + mechanical tooth occlusion dual anti-loosening structure, ideal for dynamic vibration working conditions with higher connection safety.

Short Foreign Trade Promotion Copy (for Listing & Cold Email)

Our galvanized carbon steel serrated hex flange anti-loosening bolt adopts integrated serrated flange design for stable anti-vibration locking. Carbon steel substrate with galvanized anti-rust coating adapts to all outdoor installation environments. The one-piece bolt and flange design cuts installation labor costs, widely used for PV supports, vehicle chassis and steel structure engineering. We provide customized strength grades, surface galvanizing treatment and full-size non-standard bolt production according to client drawings.