Heat Treated Hub Bolt

Product introduction

Dacromet hub bolts are key fasteners in automobile wheel assemblies. They are specially designed for high strength and harsh environments, combining excellent mechanical properties with top-notch anti-corrosion protection. The product is made of high-quality alloy steel. After strict heat treatment process, it has extremely high strength, tensile and shear properties. It can reliably withstand the complex alternating loads generated by the wheel during driving, ensuring the safety and stability of the connection. Its core advantage lies in the Dacromet coating on the surface. This electrolytic coating technology provides rust prevention capabilities that far exceed those of traditional electroplating. Its excellent salt spray corrosion resistance can effectively resist the erosion of winter snow melting agents, road salt and humid weather. At the same time, the coating has no risk of hydrogen embrittlement, ensuring the safety performance of high-strength bolts; it can withstand high temperatures above 300°C and adapt to the high-heat environment generated by the brake disc. In addition, the precise thread design and reliable anti-loosening properties ensure long-term vibration stability. It is widely used in various types of cars, commercial vehicles, etc., and is the first choice component to ensure wheel safety and improve vehicle durability.

 

Product features

1. Super corrosion resistance

This is its core advantage. The wheel hub area is directly exposed to rain, mud, especially snow melting agents (chlorides) in winter, and the corrosive environment is extremely harsh. Dacromet coating provides excellent protection, and its salt spray resistance is 7-10 times more than that of traditional galvanizing. It can effectively prevent rust for a long time, ensuring the long-term reliability of bolts and convenient disassembly.

 

2. Extremely high mechanical strength and reliability

The bolt body is made of high-quality alloy steel and undergoes a precise heat treatment process to have extremely high tensile strength, yield strength and fatigue strength. It can stably withstand the complex alternating loads, impact loads and huge shear forces from the wheels during vehicle driving, ensuring the absolute safety of wheel connections.

 

3. Fundamentally eliminate the risk of hydrogen embrittlement

Hydrogen embrittlement is a fatal flaw that can occur in high-strength steel fasteners after pickling and plating, which can lead to sudden fracture. The Dacromet treatment process does not require pickling and electrolysis, which fundamentally eliminates the possibility of hydrogen atoms intruding into the steel, ensuring the highest safety level of the product.

 

4. Excellent high temperature resistance

When the wheels are braking, the brake discs and wheel hubs generate a lot of heat. Dacromet coating can withstand high temperatures above 300°C without discoloration, melting or performance degradation, ensuring the stability of protective performance under extreme working conditions.

 

5. Precise thread and fit performance

The product has precise thread manufacturing tolerances to ensure a precise and reliable fit with the hub nut or threaded hole. This not only provides stable pre-tightening force, but also has good anti-loosening properties, which can effectively resist vibrations during vehicle driving.

 

Product application

1. Passenger car and commercial vehicle wheel assembly

This is its core application area. As a key connection that fixes the wheel to the wheel hub, it is directly related to driving safety. Its super salt spray corrosion resistance can effectively resist the serious erosion of road snow melting agents; its high strength and anti-fatigue characteristics ensure its absolute reliability under long-term vibration and complex loads.

 

2. New energy vehicles

Especially suitable for new energy vehicles that are sensitive to weight and vibration characteristics. Its high strength and anti-vibration performance can meet the requirements of instant high torque working conditions of electric vehicles. At the same time, Dacromet processing has no risk of hydrogen embrittlement and meets the highest safety standards for key components of new energy vehicles.

 

3. Commercial vehicles and heavy machinery

Widely used in wheel hub connections of trucks, buses, construction machinery and agricultural vehicles. These vehicles have heavy loads and harsh working environments, and have extremely high requirements on the strength and corrosion resistance of bolts. Dacromet wheel hub bolts can withstand huge shear forces and provide long-term protection in harsh environments such as mud, water, sand and gravel.

 

4. High-performance modification and racing fields

On high-performance modified cars and racing cars, wheel hub bolts need to be removed and installed frequently to replace tires. The excellent wear resistance of Dacromet coating can ensure that the threads remain in good condition after repeated disassembly and assembly. At the same time, its lightweight and high reliability are also popular.

 

5. Rail transit field

It is also used to fix wheel sets or accessory parts of some rail transit vehicles. Its weather resistance and reliability can meet the long-term and high-safety operation requirements of rail transit.

 

FAQ

Q: Why is it particularly recommended to use Dacromet coating for wheel hub bolts instead of ordinary galvanizing?

A: The core reasons are corrosion resistance and safety. The wheel hub area is easily exposed to strong corrosive substances such as snow melting agents and salt. Dacromet's salt spray resistance is 7-10 times that of ordinary galvanizing, providing long-term protection. More importantly, Dacromet processing has no risk of hydrogen embrittlement and avoids the fatal risk of sudden fracture of high-strength bolts due to hydrogen embrittlement. It is much safer than the electroplating process.

 

Q: Can Dacromet hub bolts be reused?

A: It is not recommended to reuse it multiple times. Wheel hub bolts are critical safety components that are subject to precise pretension and micro-deformation each time they are tightened. Repeated use can cause: Metal fatigue: The strength of the bolt decreases and there is a risk of breakage. Thread wear: affects the accuracy of the preload force, causing looseness. Coating wear: Reduced corrosion resistance. To ensure safety, after tire replacement or repairs, it is recommended to follow the vehicle manufacturer's regulations and replace new bolts if necessary.

 

Q: When installing Dacromet hub bolts, do I need to use a torque wrench?

A: You must use a torque wrench and tighten strictly in accordance with the torque value specified by the vehicle manufacturer.

Too little torque will cause the bolts to loosen, causing the wheel to shake or even fall off; too much torque will cause the bolts to be overstretched, yielding or even breaking. Precise torque is the lifeblood of a safe wheel connection.

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