Knurled Wheel Hub Bolts

Product introduction

A knurled hub bolt is a high-strength fastener designed to secure a wheel hub to a vehicle's driveshaft. Its most distinctive identifying feature is the three-dimensional anti-slip texture (usually cross-hatch or straight texture) precisely rolled into the head of the bolt. This design is not only an industrial logo in appearance, but also the core function of realizing efficient manual preloading. In the production practice of non-standard parts factories in China, the density and angle of the knurl pattern can be customized according to the customer's brand needs to achieve the unification of function and brand recognition.

 

Product design and features

The design of this type of bolt is an example of function-oriented design. The head is knurled to provide initial installation torque, and the rod is designed to be fully threaded or with an unthreaded polished rod guide section depending on the application scenario. The thread precision is extremely high to ensure perfect engagement with the hub nut or shaft head threads. As a typical cold heading non-standard part, its production makes full use of the advantages of cold plastic deformation to make the metal streamlines complete and the internal structure dense, thus laying a high-strength foundation for the product at the source. Many professional Chinese cold heading non-standard parts factories have been able to achieve complex integrated molding and reduce secondary processing.

 

Materials, craftsmanship and core performance

Material: Mainly made of high-quality medium carbon steel, alloy steel, etc. to meet high strength requirements.

Process: The process covers precision cold heading forming, thread rolling (rather than cutting), precise heat treatment (quenching and tempering to obtain ideal core toughness and surface hardness), and professional surface treatment (such as Dacromet, zinc-nickel coating, providing anti-corrosion protection with more than 1,000 hours of salt spray testing).

Performance parameters: The performance level generally reaches level 10.9 or 12.9, which means that its tensile strength is not less than 1000MPa and 1200MPa respectively. It is a veritable "safety guard" among automotive parts fasteners and can reliably withstand alternating impact loads during vehicle driving.

 

Functions and application areas

Its core function is to provide a safe, reliable and reproducibly detachable connection to ensure that the wheel assembly remains absolutely fixed to the axle under complex forces (including shear, tensile and bending moments during acceleration, braking, and cornering).

Application fields: Widely used in passenger cars (especially the modification market), commercial vehicles, construction machinery and rail transit fields. For heavy-duty commercial vehicles, it is a key safety component in the auto parts fastener list. China's leading non-standard parts factory is providing customized solutions that meet strict standards for domestic and foreign new energy vehicle and heavy truck manufacturers.

 

Installation instructions and safety warnings

Tightening must be done using a torque wrench to the torque value specified by the vehicle manufacturer or bolt supplier. This is the absolute prerequisite for this type of product to exert its design performance and prevent bolts from breaking due to loosening due to insufficient pre-tightening force or overload. Before installation, make sure the threads are clean and free of oil, and it is recommended to check the torque regularly.

 

Quality Standards and Customization Guidelines

Products strictly follow ISO, DIN, GB and other relevant standards. Five key parameters need to be confirmed when selecting:

Thread specifications, rod length and structure, head style and size (flange surface, cone surface, etc.), performance level, and surface coating requirements can be customized according to drawings or samples. As a purchaser or engineer, cooperating with a Chinese cold heading non-standard parts factory with complete technical services and quality control systems is the key to ensuring product compliance, traceability, and long-term stable supply.

 

FAQ

Q: How to choose the correct specification of knurled wheel hub bolts?

A: The selection must be accurate. Please confirm the four key parameters in sequence: 1) Thread specification (such as M12×1.5); 2) Rod length (total length from the pressure-bearing surface); 3) Head style (such as flange surface, tapered surface) to match the hub hole; 4) Performance level (commonly used 10.9 or 12.9). The best practice is to refer to the original vehicle specifications or consult the technical staff of our China cold heading non-standard parts factory for professional selection support.

 

Q: There is no knurled design, can I replace it with a knurled bolt?

A: Yes, but the premise is that "function interchange" must be met. As long as the thread specifications, rod length, head pressure surface form, torque value and strength level of the new bolt are exactly the same as the original ones, they can be safely replaced. The knurled design only provides anti-slip convenience for installation and does not affect the core mechanical properties.

 

Q: Can knurled hub bolts be reused?

A: It is not recommended to reuse it multiple times. As a critical automotive component fastener, it may undergo microscopic deformation after each tightening. Especially after repeated disassembly and assembly, or after being subjected to extremely high loads, its preload force and fatigue resistance will decrease. To ensure absolute safety, it is recommended to replace the bolts with new ones on important occasions or after several disassembly and assembly operations.

 

Q: Can it be customized according to our special needs?

A: Absolutely. This is one of the core advantages of our China non-standard parts factory. We can customize non-standard thread lengths, head sizes, knurling styles, special coatings or branding according to your drawings or technical requirements. Welcome to provide specific needs, we will provide "one-stop" cold heading non-standard parts solutions from R&D to production.

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