At Huazhe, we call this Bottom Arm Ball Joint the "dedicated partner" for the lower control arm. It is specifically designed for the vehicle's lower control arm and serves as the key connection between the lower control arm and the steering link. Its core function is to transmit steering forces stably, allow multi-directional wheel movement, and coordinate the operation of both the steering and suspension systems.
A repair shop customer once told us, "Some universal ball joints installed on lower control arms never feel quite right. After a while, they loosen. Model-specific parts with original specifications work much better." This taught us that Bottom Arm Ball Joint must be model-specific to ensure reliable performance.
Precision Ground Ball Surface: Ra0.2 for Smooth Rotation
This Bottom Arm Ball Joint is made from high-quality, international standard alloy steel. It is optimized for the load characteristics of the lower control arm. Its tensile strength exceeds 850 MPa, providing excellent fatigue and wear resistance.
The main body is precision-forged, producing a dense material structure with high strength. Forged blanks undergo flaw detection to ensure no internal defects. Dimensional consistency is strictly controlled to provide a reliable foundation for subsequent finishing. The ball surface undergoes precision grinding and is paired with specialized grease for smooth rotation, even wear, and long service life. After grinding, the ball surface roughness is controlled to Ra 0.2 or less.
Cationic Electrophoresis for Rust Protection: 96% Installation Success
The surface receives cationic electrophoretic coating for corrosion and rust resistance. In salt spray tests, it lasts 48 hours without red rust. This ball joint adapts to a variety of climates and prevents corrosion-related damage.
It precisely matches the lower control arm structure and mounting dimensions of mainstream vehicle models, requiring no modifications for installation. It can be directly installed as a replacement for the original part. During development, we studied lower control arm parameters across mainstream models to ensure broad compatibility.
This Bottom Arm Ball Joint passed rigorous testing:
Adaptability test: over 96% installation success across 15 mainstream models
Fatigue test: 2.5 million reciprocating cycles with clearance change under 0.12 mm
Salt spray test: 48 hours with no red rust
Reliable, precise, and model-specific-this ball joint ensures smooth steering and long-lasting lower control arm performance.
Key Specifications
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Project |
Specifications |
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Product Name |
Bottom arm ball joint |
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Compatible Models |
Passenger Vehicles & Commercial Vehicles |
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Main Material |
High-Quality Alloy Steel |
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Surface Finish |
Cathodic Electrophoretic Coating |
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Compatible Components |
Lower Control Arm & Steering Tie Rod |
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Core Function |
Connects the lower control arm to the steering tie rod; transmits steering forces |
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Key Advantages |
Precision-Engineered Fit, Precise Steering, High Durability |
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Installation Method |
Direct replacement for OEM parts; no modifications required |
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