OEM Replacement Leaf Spring for SINOTRUCK Truck Rear Suspension

OEM Replacement Leaf Spring for SINOTRUK Truck Rear Suspension

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OEM Replacement Leaf Spring for SINOTRUK Truck Rear Suspension​

Designed as a direct OEM replacement for SINOTRUK (China National Heavy Duty Truck Group) truck rear suspension systems, our leaf spring is engineered to restore original factory ride quality, load capacity, and durability. As a critical load-bearing component in the suspension architecture, it expertly balances the need for heavy-duty load support with the necessity of absorbing road irregularities. Whether for long-haul logistics or demanding construction applications, this spring delivers the reliability expected by commercial vehicle operators.

Technical Design & Engineering Advantages​

Precision-Engineered to OEM Specifications

Manufactured to exact dimensional tolerances and material specifications that mirror SINOTRUK’s original design parameters. This ensures a seamless, bolt-on installation without the need for modifications, guaranteeing proper alignment and compatibility with existing mounting hardware and brackets.

Optimized Multi-Leaf Configuration

Features a scientifically designed multi-leaf assembly (typically consisting of a master leaf and graduated helper leaves). This configuration provides a progressive spring rate, allowing the suspension to handle light loads with ease while offering substantial resistance and stability under maximum payload conditions. The precise curvature (camber) and arch height are maintained to ensure correct axle positioning.

Superior Material & Forging Technology

Constructed from high-grade spring steel alloy selected for its exceptional tensile strength and fatigue resistance. The leaves undergo precision hot forging and controlled quenching/tempering processes to achieve a fine-grain microstructure, significantly enhancing the component’s ability to withstand millions of load cycles, impacts, and harsh environmental conditions without failure.

Advanced Surface Protection System

To combat the rigors of heavy transport and diverse climates, the spring assembly is treated with a multi-stage corrosion protection process. This typically includes shot peening to relieve internal stresses and apply a compressive surface layer, followed by a high-performance epoxy powder coating or electrophoresis finish. This creates a robust barrier against moisture, road salt, and abrasive debris, preventing rust and ensuring long-lasting structural integrity.

Comprehensive Performance Benefits

  • Restored Load Capacity:​ Returns the vehicle’s rear suspension to its original rated payload capacity, preventing sagging and maintaining proper ride height.
  • Enhanced Stability:​ Minimizes axle wrap and body roll during acceleration, braking, and cornering, contributing to safer vehicle handling.
  • Extended Service Life:​ The combination of superior materials and protective coatings ensures a significantly longer operational lifespan compared to standard aftermarket alternatives.
  • Reduced Maintenance Costs:​ Engineered for durability, reducing the frequency of inspections and replacements, thereby lowering the total cost of ownership for fleet operators.

🏭About Zhengzhou Haishuo Automotive Parts Co., Ltd.

We are a professional manufacturer and exporter of heavy-duty truck suspension components, established in 2016 and located in Zhengzhou, Henan Province, China. Specializing in leaf springs, chassis parts, and suspension accessories, we have grown into one of the leading suppliers in China’s automotive leaf spring aftermarket.

Production Capacity: Over 4,000 tons of leaf springs in stock, enabling rapid order fulfillment

Global Reach: Exported to over 100 countries and regions, including North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and Western Europe

OEM/ODM Services: Custom manufacturing available for private label, OEM, and aftermarket projects

Quality Assurance: Backed by SGS audit certification, with dedicated QA/QC inspectors ensuring every product meets international standards

Comprehensive Product Line: Our catalog includes heavy-duty, conventional, parabolic, and trailer leaf springs, plus complete accessories like U-bolts, bushings, clips, and shackles

Leaf Spring Technical Parameters

Item Specification
Material 50CrVA / 51CrV4 / 55CrMnA / 60Si2Mn
Width 60mm – 120mm
Thickness 6mm – 30mm
Load Capacity 500kg – 20,000kg
Surface Treatment Painting / E-coating

📦Packaging, Shipping & Terms

Packaging: Standard export wooden crates or cartons with protective wrapping to prevent damage during transit

Shipping Ports: Qingdao Port, Tianjin Port and LianYun Port

Lead Time: 30 days (peak season) / 30 days (off season)

Accepted Incoterms: FOB, EXW, DDP, CIF, CFR

Payment Terms: L/C, T/T, D/P, PayPal, Western Union, small-amount payment options available

After-Sales Support: Professional sales and technical team providing order follow-up, product consultation, and after-sales service

Why Choose Our Leaf Springs

  • Manufactured using high-strength alloy steel (SUP9 / 60Si2Mn)
  • Heat-treated for improved hardness and fatigue resistance
  • Shot peening surface treatment for longer service life
  • Strict load and fatigue testing before shipment
  • OEM interchangeable fitment with Dongfeng systems
  • Stable performance under heavy-duty working conditions

FAQ

Q1: Is this part OEM or aftermarket?
A: It is an OEM-compatible replacement designed for Dongfeng truck suspension systems.

Q2: What material is used in this leaf spring?
A: High-strength alloy steel such as SUP9 or 60Si2Mn.

Q3: Can you produce customized leaf springs?
A: Yes, OEM and customized production is available.

Q4: What is your delivery time?
A: Typically 20–30 days depending on order quantity.

Q5: What vehicles is it compatible with?
A: It is suitable for various Dongfeng heavy-duty truck platforms.

Common Problems of Worn Leaf Springs

Vehicle tilting or sagging on one side
Reduced load-carrying capacity
Excessive vibration during driving
Visible cracks or deformation on spring leaves

When to Replace Leaf Springs

Leaf springs should be replaced when fatigue cracks, deformation, or reduced elasticity are observed. Delayed replacement may affect vehicle safety and suspension performance.

Important Notes

This product is an aftermarket replacement part, not an original OEM part. It is designed to fit the specified applications as a direct replacement component.

We recommend professional installation by a qualified technician to ensure proper fit, alignment, and safety.

contact us with your vehicle details or custom requirements, and our team will assist you in finding the right leaf spring solution.

Material

50CrVA, 51CrV4, 55CrMnA,60Si2Mn
Certificate

TS16949,ISO,CE
Craftsmanship

Multiple Isothermal Quenching and Tempering Proces
Specification

Customizable according to drawings
Packing

Export Standard Packing by Pallet
Weight

1500kg
Packaging size

170*60*60cm

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