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T11-2902011
HongPro
T11-2902011
Our automotive coil springs are engineered to deliver uncompromising performance, safety, and durability. Manufactured from high-grade, certified chrome-silicon or superior carbon steel, they are precisely heat-treated to achieve an optimal balance between strength and flexibility. This results in a consistent spring rate and superior resistance to sagging, fatigue, and corrosion.
Rigorously tested to meet or exceed international quality standards (such as ISO 9001), our springs undergo millions of compression cycles in fatigue testing to ensure long-term reliability. They are designed to restore original vehicle geometry, providing critical support for the suspension system, ensuring stable handling, proper tire contact, and passenger safety. Trust in our OEM-quality components, backed by data-driven manufacturing, for a perfect fit and exceptional performance in the aftermarket.
Our coil springs are crafted from high-grade 54SiCr6 Chrome-Silicon Steel, a material renowned for its exceptional yield strength and toughness. This alloy is precisely heat-treated in a computer-controlled oven and then shot-peened, a process that compresses the surface, creating microscopic resistance to crack propagation. This results in a fatigue life that exceeds 2 million cycles in rigorous dynamic testing—far surpassing standard industry requirements. This means unparalleled durability and a significantly reduced risk of spring sagging or failure over time, ensuring long-term suspension integrity.
To combat rust and ensure longevity in all climates, our springs feature a multi-stage protection system. After meticulous surface cleaning, each spring receives a robust zinc phosphate coating for superior adhesion, followed by an thick, electrostatically-applied epoxy-polyester powder coat. This combination creates a barrier that withstands over 500 hours of neutral salt spray testing (ASTM B117) without red rust. This robust defense against corrosion preserves both the spring's function and aesthetic appeal, directly translating to greater customer satisfaction and fewer returns.
Every batch of our coil springs is manufactured with CNC coiling technology, guaranteeing micrometer-level precision in wire diameter, coil pitch, and overall geometry. This ensures a consistent and accurate spring rate (typically within a 3% tolerance) across all production runs. Such precision is critical for maintaining correct vehicle ride height, ensuring stable handling, and providing optimal tire contact with the road. You can be confident that every spring you stock delivers predictable, OEM-matching performance for a safe and comfortable drive.
We operate a vertically integrated manufacturing facility certified to IATF 16949 standards, the global technical benchmark for the automotive industry. Our quality control is data-driven; from raw material spectrometry analysis to final load-deflection verification, every step is documented. Our springs are 100% load-tested and are proven to meet or exceed original equipment specifications for dimensional accuracy and performance. This commitment to quality ensures perfect fitment, reliable performance, and reinforces your brand as a source for trustworthy automotive components.
| Parameter | Specification & Data | Testing Standard / Note |
| Material Grade | 54SiCr6 (Chrome-Silicon Steel) / 55Cr3 (Chrome Steel) | Equivalent to SAE 9254 / SAE 5150; Chosen for optimal strength-to-weight ratio. |
| Tensile Strength | 1600 - 1900 MPa | Provides exceptional resistance to permanent deformation (sagging). |
| Surface Treatment | Zinc Phosphate Pre-treatment + Epoxy-Polyester Powder Coating | Superior corrosion resistance, passing 500+ hours of Neutral Salt Spray Test (ASTM B117). |
| Fatigue Life | > 1,000,000 cycles (Minimum) | Tested under dynamic load conditions simulating extreme road surfaces. |
| Wire Diameter | 10 mm - 22 mm | CNC-controlled for a tolerance of ±0.1mm, ensuring consistent spring rate. |
| Outer Diameter | 80 mm - 180 mm | Precisely engineered for specific chassis and strut assembly requirements. |
| Free Height | 200 mm - 450 mm | Manufactured to a tolerance of ±1.5% to guarantee correct vehicle ride height. |
| Spring Rate (Linear) | 15 N/mm - 60 N/mm | Controlled to within ±5% of specified value for predictable handling and comfort. |
| Load at Block Height | As per OEM-specific drawings | 100% load-tested to verify performance under maximum compression. |
Here are specific application scenarios of Coil Spring:
Over time, every vehicle's original coil springs succumb to metal fatigue and stress, leading to a drop in ride height. This compromises handling stability, accelerates tire wear, and puts additional strain on other suspension components like shock absorbers. Our direct-replacement springs are engineered to restore the vehicle's original geometry and specified spring rate, ensuring optimal alignment, predictable handling, and passenger safety. This is the essential solution for workshops addressing customer complaints of a sagging suspension or a "bottoming out" feel.
Vehicles frequently used for carrying heavy loads or towing, such as vans and light trucks, often experience accelerated spring sag. Our heavy-duty or reinforced coil springs are designed to handle increased payloads without compromising ride quality. By providing a higher spring rate and greater load capacity, they prevent the rear from squatting under weight, maintaining proper headlight alignment and ensuring stable, secure braking and handling for improved safety and vehicle longevity in demanding conditions.
For vehicles that have been out of production for years, finding quality replacement parts is a major challenge. Aged springs often lose significant height and tension. Our catalog includes specifications for a wide range of classic and niche vehicles. Using our springs restores the car's correct stance and ride characteristics, which is crucial for an authentic restoration. This application is vital for restoration specialists and enthusiasts seeking to preserve the original driving dynamics and appearance of cherished vehicles.
Enthusiasts looking to lower their vehicle's center of gravity for improved cornering and a more aggressive stance require specialized springs. Our performance-oriented variants are designed with specific, often progressive, spring rates to reduce body roll and provide a sportier, more responsive feel without the harshness of a full racing setup. This application is perfect for the aftermarket tuning sector, offering a balanced upgrade that significantly enhances handling for a more engaging drive.
Professional Installation is Strongly Recommended. The installation of coil springs involves handling components under extreme pressure. Improper handling can cause the spring to release explosively, leading to severe injury or damage. This procedure requires specialized tools like spring compressors and professional mechanical knowledge.
If you are a qualified technician, always consult the vehicle's specific service manual for torque specifications and procedures. Ensure the new spring is correctly seated and that all related components (shock absorbers, mounts) are inspected for wear during installation. After installation, a wheel alignment is essential to ensure proper vehicle handling and tire wear.
For your safety, entrust this task to a certified professional.
