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L2905101
HongPro
L2905101
Engineered for superior durability and precise fit, this premium coil spring is manufactured from high-grade chrome-silicon steel, ensuring exceptional resistance to fatigue and sagging. Our rigorous production process, certified under IATF 16949 standards, guarantees consistent quality and reliable performance.
Extensive laboratory testing, including over 100,000 cycles of fatigue testing, validates a service life that significantly exceeds industry averages. This spring effectively maintains optimal vehicle height, improves ride stability, and ensures correct wheel alignment for a safer and more comfortable driving experience.
It is a direct OEM replacement part, guaranteeing perfect compatibility with relevant vehicle models. We confidently back this product with a professional warranty, making it a trusted choice for distributors and repair shops worldwide.
Our coil springs are manufactured from high-carbon 55Cr3 or superior 60Si2Mn spring steel, chosen for its exceptional yield strength and fatigue resistance. This material undergoes a precise thermal hardening process, resulting in a component that withstands over 1,000,000 cycles in SAE J921 fatigue testing—far exceeding standard industry requirements. This translates directly to a longer service life, reduced sagging over time, and consistent performance under heavy loads, making it a reliable, heavy duty suspension spring for long-term use.
Every spring is engineered to exact OEM specifications, ensuring perfect ride height restoration, correct wheel alignment, and stable handling. By maintaining the vehicle's original geometry, our performance coil spring directly contributes to safer driving by improving road contact and steering response. This precision fit guarantees that the suspension system works in harmony, preventing premature wear on other components like tires and shock absorbers, and providing a comfortable, controlled ride quality.
We operate a state-of-the-art manufacturing facility with a strict quality management system certified to IATF 16949:2016, the global technical standard for the automotive industry. Each production batch is subject to stringent checks for dimensions, load capacity, and surface finish. Our commitment to quality is further validated by third-party lab test reports and international certifications, providing you with the confidence that you are installing a premium-grade, guaranteed automotive suspension part.
To combat rust and corrosion from road salt, moisture, and debris, our coil springs feature a robust multi-layer protection system. This includes a high-efficiency phosphate pre-treatment for superior paint adhesion, followed by a thick epoxy-polyester powder coating. Many of our models also undergo an additional shot-peening process, which compresses the steel surface to create micro-impervious layers that significantly enhance resistance to stress corrosion cracking, ensuring longevity in all climates.
Designed as a direct OEM replacement coil spring, our product ensures a perfect fit without any modifications required. This eliminates installation guesswork and saves valuable time for mechanics. We stand behind the quality of our components with a comprehensive 24-month or 50,000-kilometer warranty, supported by our global distribution network. This makes it a trusted and risk-free choice for wholesalers, retailers, and repair shops worldwide looking for a dependable vehicle-specific coil spring.
| Parameter | Specification | Details / Standard |
| OEM / Interchange Number | To be specified per vehicle model | Compatible with genuine part numbers for relevant Lifan models. |
| Spring Type | Helical, Coil Spring | Front or Rear as per application. |
| Material Grade | 54CrSi6 / 60Si2Mn High-Carbon Steel | Superior to standard SAE 5160; offers excellent fatigue resistance and toughness. |
| Material Standard | DIN 17221 / SAE J1573 | Compliant with international automotive spring steel standards. |
| Wire Diameter | 12.5 mm - 16.5 mm (Application specific) | Precisely controlled to ensure consistent load-bearing capacity. |
| Outside Diameter | 130 mm - 160 mm (Application specific) | Engineered for perfect fit within the vehicle's strut assembly. |
| Free Height | 320 mm - 450 mm (Application specific) | Ensures correct installation and initial tension. |
| Spring Rate (Linear) | 20 N/mm - 35 N/mm (Application specific) | Provides the optimal balance between ride comfort and handling stability. |
| Surface Treatment | Shot Peening + Epoxy-Polyester Powder Coating | Shot peening induces compressive stress for enhanced fatigue life. Powder coating provides superior corrosion resistance (up to 500 hours salt spray test, ASTM B117). |
| Load Testing | Dynamic Fatigue Test (>1,000,000 cycles) | Tested per SAE J921 standard, far exceeding minimum cycle requirements to prevent sagging and failure. |
| Certification | IATF 16949:2016 | Manufactured in a facility certified to the global automotive quality management standard. |
Here are specific application scenarios of Coil Spring:
Over time, factory-installed springs can sag or weaken due to constant stress and exposure to harsh road conditions. Our coil spring is the ideal direct replacement for mechanics performing scheduled maintenance or addressing common symptoms like abnormal tire wear, inconsistent ride height, or a noticeable drop in ride comfort. It restores the vehicle's original geometry and handling characteristics, ensuring optimal performance and safety.
For auto repair shops and service centers, this product is a trusted solution for comprehensive suspension overhauls. When replacing shock absorbers or struts, installing a new pair of matching coil springs is critical for balanced performance. Our spring, compliant with IATF 16949 manufacturing standards, guarantees a perfect fit and reliable function, making it a professional-grade choice for restoring vehicle safety and integrity after collisions or general wear and tear.
Drivers experiencing a bottoming-out sensation over bumps or poor handling in corners need a spring that restores stability. Our product, crafted from 54CrSi6/60Si2Mn steel and tested to over 1 million fatigue cycles, provides consistent support and improved road holding. It is an excellent upgrade for vehicles that frequently carry heavy loads or for owners seeking to enhance driving safety and comfort with a more robust suspension component.
As a premium aftermarket part, this coil spring is perfectly suited for wholesalers and distributors building inventory for specific vehicle segments. Its certified quality, durable anti-corrosion coating, and comprehensive warranty make it a low-risk, high-value product for your catalog. You can confidently supply this to your retail and repair shop partners, knowing it meets stringent international quality and performance benchmarks.
For your safety, always entrust the installation of this coil spring to a certified professional mechanic. The installation process requires specialized tools, including a hydraulic spring compressor, and involves handling components under extreme pressure. Incorrect handling can lead to serious injury or damage to the vehicle.
Before installation, ensure the new spring is compared side-by-side with the original part to confirm correct specifications. Always replace coil springs in pairs (both front or both rear) to maintain balanced vehicle handling and stability. This ensures optimal performance, preserves the vehicle's safety systems, and upholds the product's warranty.
