Stainless Steel Flange Bolt With Nut

Product introduction

Flange bolt is a special fastener that integrates the flange plate and the bolt. The lower end of the head is equipped with an integral washer (flange plate). The diameter of the plate is much larger than that of the standard bolt head and is designed with serrated or anti-slip textures. This integrated structure can provide a larger load-bearing contact surface and achieve excellent compression resistance and anti-loosening properties. It is especially suitable for working conditions where high loads or strong vibrations need to be dispersed. It simplifies the installation process and eliminates the need for additional flat washers. Products are often made of high-strength alloy steel, and surface treatments such as galvanizing and Dacromet are applied to enhance corrosion resistance. Flange bolts are widely used in key parts such as automobile wheels, engineering machinery, steel structure connections and heavy equipment. They are an efficient solution to achieve reliable flange connections.

 

Product Features

1. Integrated design, large load-bearing area: The head comes with an integral flange, which is equivalent to a bolt and a washer in one. This enlarged contact surface can effectively disperse the pressure on the surface of the connection, prevent soft materials from being dented, and reduce the risk of bolt loosening.

2. Excellent anti-loosening and anti-vibration performance: The bottom surface of the flange is usually processed with radial or concentric anti-slip tooth patterns. These tooth patterns will bite into the surface of the connected parts when tightening, creating huge mechanical resistance, thus providing excellent anti-loosening effect in vibration and shock environments.

3. Simplify installation and improve efficiency: Since the step of installing gaskets separately is eliminated, the number of parts is reduced, making the assembly process more simplified, helping to improve installation efficiency and reducing the risk of missing gaskets.

4. Good connection rigidity and strong sealing: The larger contact area and pressing force make the connection stiffer and provide more effective sealing, especially suitable for flange connection occasions that require a certain degree of sealing.

 

Product application

1. Automobile industry: key applications: Automobile wheel hubs are the most classic application scenarios for flange bolts. It firmly connects the hub to the wheel and directly bears the huge torsion, impact and vibration during driving. Its anti-loosening reliability is crucial. Other applications: Connection of key parts such as engines, gearboxes, chassis suspensions, etc.

2. Heavy machinery and equipment: widely used in engineering machinery (such as excavators, cranes), agricultural machinery, mining equipment, etc. The steel structure connections and track connections of these equipments vibrate strongly, and flange bolts can provide stable and reliable fastening.

3. Steel structure buildings and bridges: used to connect large steel beams, trusses, support members, etc. Its expanded contact surface can better distribute the load and improve the stiffness and stability of the connection nodes.

4. Wind power and new energy fields: In wind turbines, high-strength flange bolts are widely used in key parts such as tower flanges and cabin interiors to cope with extreme alternating loads and wind-borne vibrations.

5. Piping system and valve pump body: used for docking of flanges. It can provide uniform pressing force to ensure the sealing of flange connections and prevent fluid leakage. It is commonly used in pipeline projects such as petroleum, chemical industry, and water conservancy.

 

FAQ

Q: What is the function of the "anti-slip serrations" on flange bolts? Will the contact surface be damaged with every use?

A: The core function of the anti-skid tooth pattern is to bite into the contact surface through local plastic deformation to generate a huge mechanical meshing force to prevent the bolt from rotating loose. Slight bite is expected by design and is necessary to ensure safety for most industrial applications (e.g. automotive wheels, steel structures). After disassembly, tooth marks will be left on the contact surface. This is normal.

 

Q: How to select and install flange bolts?

A: Dimensional specifications: It is necessary to confirm the nominal diameter (such as M12), pitch, nominal length and flange size. Performance level: Select according to the stress requirements. For example, grade 10.9 or grade 12.9 high-strength bolts are commonly used in automobile wheels. Surface treatment: Select according to the environment, such as galvanizing, Dacromet, geometric phosphating, etc. to provide corrosion resistance and lubricity. Installation: A torque wrench must be used to tighten strictly in accordance with the manufacturer's recommended torque values ​​to ensure sufficient preload and clamping force.

 

Q: Can flange bolts be reused?

A: It is not recommended to reuse key safety parts (such as car hubs and spindle connections). Because after one tightening, the bolt may have undergone plastic deformation and the anti-skid tooth pattern has been worn. Repeated use cannot guarantee the original pre-tightening force and anti-loosening performance, posing safety risks. For non-critical occasions, it can be reused with caution depending on the situation, but careful inspection is required.

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