The Flange Bolt is an innovative fastener that integrates a traditional hex head with a one-piece flange (washer). Its unique monolithic flange design effectively distributes load, protects connected surfaces when under preload, and provides exceptional anti-loosening performance. It has become the preferred choice for numerous demanding, high-vibration applications.

I. Core Features & Advantages

1. Expanded Bearing Surface, Protects Substrate
The integrally formed flange provides a bearing area far exceeding that of a standard bolt head. This distributes the bolt's clamping force over a larger surface area, effectively reducing pressure on the joint surface. It prevents crushing of soft materials (like aluminum alloys, composites) and minimizes damage to coated or treated surfaces.

2. Superior Anti-Loosening, Vibration-Resistant Stability
The underside of the flange is typically designed with serrations or knurls. During tightening, these teeth bite into the joint surface, creating a powerful mechanical locking effect. This greatly increases resistance to loosening under lateral vibration or alternating loads, offering an efficient alternative to the "bolt + flat washer + spring washer" assembly.

3. Simplified Installation, Enhanced Efficiency
The one-piece design means only one component needs to be handled during assembly, eliminating the need for separate washers. This simplifies inventory management and on-site installation, significantly improving assembly efficiency and reducing the risk of missing washers.

4. Robust & Durable, Comprehensive Specifications
Typically manufactured from medium carbon steel or alloy steel, and heat-treated to achieve high strength grades (e.g., Class 8.8, 10.9, 12.9). Various surface finishes are available, such as zinc plating, Dacromet®, nickel plating, etc., to meet different corrosion resistance needs. Specifications cover M6 to M20 and beyond, fulfilling various load requirements.

II. Technical Parameters Summary

III. Selection & Usage Guidelines

Prioritize Strength: Select the appropriate strength grade based on the design load and safety requirements of the joint. For critical load-bearing or dynamic load points, Class 10.9 or higher is recommended.

Anti-Loosening Choice: For applications with persistent vibration or shock, flange bolts with serrations should be prioritized for optimal anti-loosening effect.

Material Compatibility: Consider environmental corrosivity. For outdoor, coastal, or chemical environments, stainless steel (preferably A4-316) or Dacromet®-coated products should be selected.

Correct Installation: Always use a torque wrench to tighten to the recommended installation torque value. This ensures the design preload is achieved while preventing bolt stretching or fracture from over-tightening.

In summary, the Flange Bolt is a modern fastening solution that combines efficiency, reliability, and convenience. Through the intelligence of integrated design, it addresses common pain points of traditional bolt assemblies regarding loosening, vibration resistance, and substrate protection, providing powerful assurance for enhancing the connection reliability of various equipment and structures.