At JUNWEI, we understand that vehicle safety starts with the basics. Wheel lug bolts are the unsung heroes, shouldering the heavy responsibility of securing the wheels—the vehicle's sole point of contact with the road. A failure can be not only inconvenient but potentially catastrophic. Understanding how these critical components ensure safety is crucial.
Wheel lug bolts generate clamping force, securely securing the wheel assembly to the hub. This connection must withstand:
Dynamic Forces: The constant stresses of acceleration, braking, cornering, and collisions with uneven roads.
Vibration: Engine vibrations and road-induced shaking can gradually loosen inadequately tightened fasteners.
Thermal Cycling: Expansion and contraction caused by brake heat and ambient temperature fluctuations.
Environmental Attack: Exposure to water, road salt, dirt, and chemicals can cause corrosion.
We primarily utilize high-grade carbon and alloy steels, and for specific high-performance or corrosive environments, we employ stainless steel or special coatings. Precision cold forging enhances grain fluidity, resulting in inherent strength and fatigue resistance that surpasses machined bolts.
| Material Grade | Minimum Tensile Strength (MPa) | Minimum Yield Strength (MPa) | Key Safety Benefit |
| Carbon Steel 8.8 | 800 | 640 | Reliable strength for standard passenger vehicles |
| Carbon Steel 10.9 | 1040 | 940 | Higher clamping force, increased fatigue resistance |
| Alloy Steel 12.9 | 1220 | 1100 | Maximum strength, high fatigue resistance under extreme loads |
| Stainless A2-70 | 700 | 450 | Excellent corrosion resistance, good strength |
| Stainless A4-80 | 800 | 600 | Superior corrosion resistance (marine grade), enhanced strength |
Manufactured on multiple machining centers, our wheel lug bolts produce precise, clean, and consistent threads. Precise thread pitch and shape ensure optimal engagement with the wheel and hub, evenly distributing clamping force and preventing stress concentrations or thread stripping—critical for maintaining torque.
When a bolt is tightened to the specified torque value, the correct clamping force is generated. Our wheel lug bolts are designed to achieve and maintain this clamping force. Precisely controlled hardness prevents stretching under load and avoids brittle fracture. Our wheel lug bolts can withstand the required high torque without deformation or breakage.
