12 points flange bolts are specialized fasteners designed to deliver superior strength, precise torque control, and enhanced clamping efficiency in demanding industrial applications. Recognized for their unique head design and integrated flange, these bolts are widely used in the aerospace, automotive, energy, and heavy machinery sectors where reliability and performance are critical.

Design and Structure

A 12 points flange bolt, also known as a double hex bolt, features a head with twelve equally spaced points that resemble a star-shaped pattern. This design allows for engagement with a 12-point socket or wrench, providing a tighter grip and better torque distribution than standard hex bolts. The integrated flange acts as a washer, distributing the load evenly over the contact surface and preventing damage to connected materials.

Material Composition

12 points flange bolts are typically manufactured from high-strength materials such as alloy steel, stainless steel, or titanium. Depending on the application, they may also be heat-treated or surface-coated with zinc, black oxide, or cadmium for added corrosion resistance and durability.

Key Features

High Torque Transmission – The 12-point design enables secure engagement with tools, allowing higher torque application without rounding off the bolt head.

Integrated Flange Base – The flange eliminates the need for separate washers, simplifying installation and providing better load distribution.

Precision Fit – Designed for close tolerances, ensuring alignment accuracy in high-performance assemblies.

Enhanced Strength – Made from hardened materials that can withstand extreme mechanical stress and vibration.

Corrosion Protection – Surface treatments help resist oxidation and wear in harsh operating environments.

Advantages of 12 Points Flange Bolts

Compared to conventional hexagon bolts, 12 points flange bolts offer several advantages. The multi-point head allows for use in confined spaces where tool clearance is limited. The design ensures even pressure distribution, minimizing the risk of loosening under vibration. Additionally, the aesthetic finish and precise machining make them ideal for high-performance equipment where both functionality and appearance matter.

Common Applications

Aerospace Industry – Used in aircraft engines and structural assemblies where strength-to-weight ratio and reliability are paramount.

Automotive Engineering – Commonly applied in engines, transmissions, and suspension systems that require tight tolerances and high clamping force.

Heavy Equipment – Suitable for hydraulic systems, compressors, and turbines exposed to high pressure and temperature variations.

Oil and Gas Sector – Used in pipeline flanges, pressure vessels, and offshore platforms due to their resistance to corrosion and vibration.

Power Generation – Applied in turbines, generators, and high-load machinery components for secure fastening under dynamic loads.

Installation Considerations

When installing 12 points flange bolts, proper torque settings must be followed to achieve optimal clamping force. Using calibrated torque wrenches ensures accuracy and prevents over-tightening, which could lead to bolt fatigue or joint failure. Additionally, pairing these bolts with compatible high-strength nuts ensures reliable performance under heavy mechanical loads.

Summary

12 points flange bolts represent a blend of engineering precision, durability, and efficiency. Their unique head design, combined with robust materials and corrosion resistance, makes them indispensable in modern industrial and mechanical systems. Whether in aerospace, automotive, or energy industries, these bolts deliver the strength and reliability necessary for high-stress environments where safety and performance cannot be compromised.