12 Point Flange Bolt

In heavy machinery, automotive engineering, and high-vibration industrial environments, standard hexagonal bolts often fail to meet application requirements. They are either difficult to install in confined spaces such as engine compartments and equipment interiors, resulting in low alignment and engagement efficiency; or they are prone to loosening under continuous vibration, leading to connection failure risks and directly impacting equipment operational safety and personnel safety.

We are a source factory with over 15 years of experience in 12 Point Flange Bolt research, development, and manufacturing. For many years, we have been deeply involved in key sectors such as oil and gas, mining equipment, and high-end automotive manufacturing, serving numerous global industry clients. Based on our deep understanding of the pain points in these high-load scenarios, we know that the reliability of fasteners in critical areas is paramount.

Core Technological Advantages

1. Unique 12-Point Head Design: Efficient Installation and Strong Torque Transmission

Fast alignment, improved installation efficiency: The double hexagonal (spline) structure with 12 contact points allows the wrench to complete an engagement with only a 30-degree rotation, compared to 60 degrees for traditional hexagonal heads. This advantage is particularly evident in confined spaces and poorly visible installation environments, such as inside engine compartments and equipment housings, significantly shortening installation time and improving operational efficiency.

Superior torque transmission, less prone to damage: The 12-point structure more tightly grips the socket, reducing wear on the bolt head and preventing slippage when applying tightening torque. This feature allows for greater torque application while avoiding head damage, better meeting high-strength fastening requirements.

Compatible with specialized tools, more convenient operation: When used with a dedicated 12-point socket, it precisely fits the head, preventing slippage during operation and further enhancing the safety and stability of the installation process.

2. Integrated Flange Design: Anti-loosening, Vibration-resistant, and Workpiece Protection

Superior anti-loosening, suitable for vibrating conditions: The flange surface has a serrated structure; when tightened, the serrations firmly "bite" into the surface of the connected part, generating strong frictional resistance and effectively preventing the bolt from loosening due to equipment vibration, especially suitable for heavy machinery, automotive chassis, and other continuously vibrating scenarios. Evenly distributed load protects the workpiece surface: The integrated flange increases the pressure-bearing area between the bolt and the workpiece, effectively preventing the bolt head from embedding into soft materials such as aluminum, plastic, and composite materials. This also ensures that the pre-tightening force is evenly distributed, preventing excessive local stress that could damage the workpiece and improving connection stability.

3. High-strength materials and processes for stable and reliable performance

High-quality material selection: High-quality carbon steel or alloy steel (such as 40Cr, 35CrMo) is used as the raw material. These materials possess excellent mechanical properties, laying the foundation for the high strength of the bolts and meeting the requirements of high-load applications.

Rigorous heat treatment process: All 12 Point Flange Bolt undergo rigorous tempering heat treatment, precisely balancing core toughness and surface hardness. This ensures that the bolts have sufficient tensile strength and wear resistance, while also resisting impact and preventing problems such as fracture and deformation during use.

Core Technical Parameters

Typical Application Scenarios

With years of industry service experience, our 12-Point Flange Bolts have been successfully applied in various demanding environments, becoming a trusted choice for numerous customers:

1. Heavy-duty and Commercial Vehicles: Used for connecting wheels, suspension systems, and engine mounts in heavy trucks and buses. They can withstand continuous vibration during long-distance transportation, offering excellent anti-loosening performance and ensuring secure connections during vehicle operation, guaranteeing driving safety.

2. Construction and Mining Machinery: Suitable for critical structural connections in equipment such as excavators, bulldozers, and road rollers. They can withstand high-intensity impacts and loads, maintaining stable connections in harsh construction environments and preventing equipment malfunction due to bolt failure.

3. Industrial Manufacturing and Energy Sector: Applied in petrochemical equipment, wind turbines, and large motor assemblies. Under complex working conditions of high temperature, high pressure, and high vibration, they ensure long-term stability and safety of connections, guaranteeing the continuous and efficient operation of energy equipment.

4. Aerospace (Specific Models): High-precision models conforming to the IFI 115 standard are used for fastening critical parts such as aircraft engines and landing gear. With ultra-high strength and reliability, they meet the stringent requirements for fasteners in the aerospace industry.

Company Strength and Quality Assurance

We are Ningbo Gangtong Zheli Fasteners Co., Ltd. Since our establishment in 2001, we have built a mature system encompassing R&D, production, and sales of fasteners. Our factory is located in the Zhenhai Chemical Industrial Zone of Ningbo, and our headquarters and foreign trade sales department are located in the Ningbo Jiangdong Eastern Business Center.  Our factory covers an area of 15,000 square meters, with a stable monthly production capacity of 2,000 tons and annual sales exceeding US$15 million. The company is equipped with a professional R&D team, a full-process supply chain management system, and large-scale warehousing facilities, focusing on the production of various fasteners and providing integrated MRO procurement and distribution services for metal fasteners to fully meet the diverse procurement needs of our customers.

In the fastener industry, quality is the bottom line. Through rigorous control throughout the entire process, we ensure that every 12-point flange bolt is trustworthy:  During raw material warehousing, each batch of raw materials undergoes spectral analysis to precisely control chemical composition, eliminating material defects from the source; during production, key indicators such as bolt hardness and tensile strength are fully inspected to prevent unqualified semi-finished products from entering the next process; in the finished product stage, multiple tests such as salt spray testing and torque testing are strictly conducted to comprehensively verify corrosion resistance and fastening reliability. The company fully implements the ISO 9001 quality management system standard and strictly follows international standards such as IFI 115-2002 for production. We can provide material reports (MTC) according to customer needs, ensuring that the product's chemical composition and mechanical properties fully meet the standards. At the same time, we implement strict batch management, with clear product identification, ensuring traceability of origin and destination, giving customers peace of mind.

Our product range is extensive, covering heavy-duty hexagonal bolts, heavy-duty hexagonal nuts, threaded rods, studs, washers, screws, etc., with materials including carbon steel, alloy steel, and stainless steel. We strictly adhere to international standards such as DIN, ISO, EN, JIS, ASTM/ANSI/ASME/SAE, BS, and AS. Our products are exported to North America, Europe, Australia, Southeast Asia, the Middle East, Latin America, and many other regions, and are suitable for various fields such as building steel structures, bridges, oil pipelines, mechanical equipment, ships, and railways.

Reasons to Choose Us

1. Direct supply from the source factory, superior quality and price: As a physical manufacturer located in Ningbo, the fastener capital of China, we have advanced cold heading, heat treatment, and testing equipment, achieving independent production throughout the entire process from raw materials to finished products. Without intermediaries, we can provide customers with highly competitive factory prices. We have sufficient stock of standard specifications and can quickly respond to delivery needs.

2. Technology-driven, rapid response: Our engineering team has rich experience in the research and development and production of high-strength fasteners, and is familiar with the standard requirements of different regions around the world. We can provide professional non-standard customization (OEM/ODM) services based on drawings or samples provided by customers; we can quickly respond to technical problems encountered by customers during use and provide targeted solutions. 3. Global Service Experience, Hassle-Free Cooperation: Our products have been exported to North America, Europe, Australia, and Southeast Asia, and we have a comprehensive logistics and after-sales service system. We can accurately match the procurement needs of global customers and are committed to establishing long-term and stable cooperative relationships with our clients.