Hub Bolt

Product introduction

Hub bolts are the core fasteners that connect the wheels and hubs of vehicles and are directly related to driving safety. It is usually made of high-strength alloy steel and undergoes quenching and tempering heat treatment. It has extremely high tensile strength, shear resistance and excellent fatigue resistance. It can withstand complex alternating loads during vehicle driving. The surface is often treated with galvanizing, Dacromet and other anti-corrosion treatments to cope with corrosion challenges under harsh road conditions. According to the model design, they can be divided into stud bolts (used with nuts) and stud bolts (screwed directly into the wheel hub) to ensure a precise fit with the wheel hub hole. This product is responsible for firmly fixing the wheel hub, brake disc and wheel to ensure the precise positioning and smooth operation of the wheel. It is a key component to ensure the safety and reliability of the automobile chassis system.

 

Product Features

1. Extremely high mechanical strength: Made of high-quality alloy steel and subjected to strict heat treatment (quenching and tempering), it has extremely high tensile strength, shear resistance and fatigue resistance. It can withstand huge dynamic loads and impacts during vehicle driving, ensuring a foolproof connection.

2. Excellent anti-loosening and shock resistance: Precision thread design (such as pitch diameter, pitch tolerance) combined with appropriate pre-tightening force can generate effective friction to prevent loosening in a continuous vibration environment and ensure the stability and reliability of the wheel assembly.

3. Excellent corrosion resistance: The surface is usually treated with anti-corrosion processes such as galvanizing and Dacromet to form a dense protective layer, which effectively resists corrosion from rain, snow melting agents, mud and other environments, prolongs the service life, and takes into account safety and durability.

4. Precise fit and positioning: The bolt shaft and the wheel hub hole adopt a transition or interference fit to ensure precise alignment during wheel installation, thereby ensuring the dynamic balance performance of the wheel and improving driving smoothness and safety.

5. Professional design and certification: Designed and manufactured in strict compliance with automotive industry standards, it must pass a series of rigorous tests and certifications to ensure that its performance fully matches the vehicle requirements, which is an important guarantee for safe driving of the vehicle.

 

Product advantages

1. Passenger car and commercial vehicle wheel fixing: This is its core application. It runs through the wheel hub unit and precisely connects the wheel, brake disc (or brake drum) and wheel hub into a whole, withstands and transmits the driving force, braking force and lateral force of the vehicle during driving, directly ensuring driving safety.

2. Installation of two wheels on commercial vehicles: On heavy-duty trucks and buses, wheel hub bolts (usually studs with nuts) are used to fix the inner and outer wheels. Their extremely high strength is the key to supporting heavy loads and ensuring the stability of the two wheels.

3. Special vehicles and mechanical equipment: widely used in off-highway vehicles such as construction machinery (such as excavators, loaders), agricultural machinery, and trailers. These working conditions are more severe and require higher strength, toughness and corrosion resistance of bolts.

4. High-performance and modified vehicles: For high-performance or modified vehicles, wheel hub bolts with higher strength levels or specially designed (such as lightweight titanium alloy bolts) will be used to meet safety requirements and performance standards under extreme working conditions.

 

FAQ

Q: What is the main reason for wheel hub bolts to break or slip?

A: The main reasons include: improper installation torque (over-tightening causes stress concentration, over-looseness causes loosening and wear), thread damage or misalignment (forcibly screwed in), material fatigue or insufficient strength, and severe corrosion. It is important to check regularly and install to the specified torque using a torque wrench.

 

Q: Can the wheel hub bolts be replaced with ordinary bolts?

A: Absolutely not. Wheel hub bolts are critical components related to life safety, and original or equivalent quality accessories with specifications and strength levels specified by the vehicle manufacturer must be used. Ordinary bolts cannot withstand huge dynamic loads and impacts, and are easily broken, leading to serious accidents.

 

Q: Do wheel hub bolts need to be checked regularly? How often should I check?

A: Yes. It is recommended that an inspection be carried out every time a tire is changed or every 10,000 kilometers driven. Mainly check for looseness, visible thread damage, excessive rust or stretching. After replacing new tires or wheels, the vehicle should be re-inspected and tightened after the first 100 kilometers of driving.

 

Q: Why do some bolts have silver or gray-black coating on their surfaces?

A: This is an anti-corrosion coating, the common ones are galvanized (silver) and Dacromet (gray black). They can effectively resist corrosion caused by rain, snowmelt, muddy water, etc., ensuring the long-term reliability of the bolts and easy disassembly.

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