Product Introduction

This rear leaf spring is a multi-leaf, heavy-duty suspension component designed for heavy-duty trucks. It consists of multiple high-strength steel leaves of graduated lengths, stacked and clamped together with metal bands to form a curved, load-bearing structure. The entire assembly is finished with a silver-gray anti-corrosion coating, and marked with specifications and branding for easy identification and traceability.

Performance

Manufactured from premium-grade spring steel (e.g., 60Si2Mn) and subjected to controlled heat treatment, this leaf spring delivers exceptional tensile strength, fatigue resistance, and consistent spring rate. It is engineered to withstand the extreme dynamic loads, impacts, and torsional forces encountered in heavy-duty operation, maintaining its structural integrity in temperatures ranging from -40°C to 120°C. The anti-corrosion coating provides superior protection against rust, salt spray, and chemical exposure, ensuring long-term durability in diverse operating environments. The multi-leaf design offers progressive stiffness, optimizing both ride comfort and load-carrying capacity.

Core Function

1. Serves as the primary load-bearing and suspension component for the rear axle, supporting the vehicle’s weight and providing a smooth, stable ride.

2. Absorbs and dissipates road impacts and vibrations, reducing stress on chassis and suspension components and extending their service life.

3. Maintains proper ride height and suspension geometry, ensuring consistent vehicle handling and stability, especially under heavy loads or during cornering, braking, and acceleration.

4. Works in conjunction with shock absorbers to control excessive suspension movement, preventing wheel hop and maintaining tire contact with the road surface for improved traction and safety.

Rear Leaf Spring WG9725520289 Sinotruk – Heavy-Duty Suspension Component for HOWO Trucks

When your heavy-duty truck carries thousands of tons over rough terrain day after day, the rear leaf spring is the unsung hero that keeps everything stable. The Rear Leaf Spring WG9725520289 Sinotruk is a factory-direct, OEM-grade multi-leaf suspension component engineered to withstand extreme loads while delivering consistent ride quality. Built from high-strength alloy steel and finished with a silver-gray anti-corrosion coating, this rear leaf spring assembly is ready to serve fleets operating in the most demanding environments worldwide.

At Mettlead, we supply genuine-quality Sinotruk chassis and suspension parts directly from China’s manufacturing base. As a result, you get competitive factory pricing without sacrificing reliability or traceability. Whether you are replacing a fatigue-damaged leaf spring or stocking your warehouse for aftermarket distribution, this part delivers the durability and fitment accuracy your customers expect.

Key Features and Benefits of the Rear Leaf Spring WG9725520289

Engineered for Extreme Load-Bearing

This multi-leaf rear spring assembly consists of multiple graduated-length steel leaves, carefully stacked and clamped together with metal bands. Consequently, the load is distributed evenly across the entire structure, which minimizes stress concentration and extends service life significantly.

Superior Anti-Corrosion Protection

Every leaf is coated with a silver-gray anti-corrosion finish that resists moisture, road salt, and chemical exposure. Therefore, even trucks operating in humid coastal regions or harsh winter climates can rely on this spring to maintain structural integrity over time.

Precise OEM Fitment

Manufactured to match Sinotruk’s original specifications, the WG9725520289 rear leaf spring drops directly into HOWO heavy-duty truck chassis without modification. This means your mechanics spend less time on installation and more time getting trucks back on the road.

Clear Identification and Traceability

Each assembly is clearly marked with part numbers, specifications, and branding stamps. As a result, warehouse teams can quickly identify and verify parts during receiving, which reduces picking errors and improves inventory management efficiency.

Cost-Effective Factory-Direct Pricing

Because Mettlead sources directly from certified manufacturers in China, you eliminate middlemen and enjoy wholesale pricing that protects your profit margins. Moreover, our flexible payment methods and reliable logistics ensure a smooth procurement experience from order to delivery.

Technical Specifications – Rear Leaf Spring WG9725520289 Sinotruk

Application Scenarios – Where This Rear Leaf Spring Performs Best

The Rear Leaf Spring WG9725520289 is specifically designed for the following applications:

• Compatible Truck Models: Sinotruk HOWO series heavy-duty trucks and related chassis platforms
• System Position: Rear suspension assembly, mounted on the rear axle as a primary load-bearing chassis component
• Replacement Scenario: Ideal for replacing leaf springs that have suffered fatigue cracking, sagging, or breakage after prolonged heavy-load operation
• Maintenance Context: Routine chassis suspension overhaul, fleet preventive maintenance programs, and post-accident repair
• Operating Environments: Mining haul roads, construction sites, long-haul freight corridors, and rough unpaved terrain

If your trucks are showing signs of rear suspension fatigue—such as uneven ride height, excessive body roll under load, or visible leaf cracks—this replacement spring restores factory-level performance immediately.

OEM/ODM Capability and Custom Packaging

Mettlead understands that different markets have different branding requirements. That is why we offer flexible white-label and custom packaging solutions for bulk buyers and distributors.

• White-Label Service: We can supply this rear leaf spring without branding or with your own brand labels applied, allowing you to build your private-label parts business confidently.
• Custom Packaging: From individual protective wrapping to branded cartons with your logo and part information, our packaging team adapts to your specifications.
• Strict Quality Control: Every batch undergoes dimensional inspection, hardness testing, and fatigue simulation to ensure consistent performance across shipments.
• Factory Visits Welcome: We encourage procurement managers to visit our supply chain facilities in China for firsthand quality verification and relationship building.

Explore our full range of Sinotruk HOWO Truck Parts or browse all available Chassis Suspension Components to find exactly what your fleet needs.

Frequently Asked Questions – Rear Leaf Spring WG9725520289 Sinotruk

What are the signs that a rear leaf spring needs replacement?

Common indicators include visible cracks or fractures on individual leaves, noticeable sagging on one side of the truck, clunking noises over bumps, and uneven tire wear on the rear axle. If your HOWO truck’s rear suspension feels softer than usual under full load, the leaf spring assembly has likely reached its fatigue limit and should be replaced promptly to prevent further chassis damage.

Is the WG9725520289 rear leaf spring a direct fit for all Sinotruk HOWO models?

This part number is designed as a direct OEM replacement for specific HOWO heavy-duty truck configurations. However, since Sinotruk produces multiple chassis variants, we recommend confirming your truck’s VIN or existing part number before ordering. Our team can help you verify fitment quickly—simply contact us with your vehicle details.

How does the multi-leaf design improve durability compared to parabolic springs?

Multi-leaf springs distribute stress across several individual leaves rather than concentrating it on fewer, thicker plates. This graduated design provides progressive load support, meaning the spring stiffens naturally as weight increases. Additionally, inter-leaf friction provides inherent damping, which reduces the workload on shock absorbers and extends overall suspension system life under heavy payloads.

What material is used, and how does the coating protect against corrosion?

The leaves are manufactured from high-strength alloy spring steel that has been heat-treated for optimal hardness and flexibility. The silver-gray surface coating acts as a barrier against moisture, road chemicals, and oxidation. Together, these material choices ensure the spring maintains its mechanical properties even after years of exposure to harsh operating conditions.

Can I order this rear leaf spring in bulk with custom packaging?

Absolutely. Mettlead specializes in bulk supply for distributors and fleet operators. We offer white-label packaging, branded cartons, and custom labeling to match your market requirements. Minimum order quantities and lead times vary, so please reach out to our sales team for a tailored quotation.

How should I store rear leaf springs before installation?

Store the assembly in a dry, covered area away from direct moisture and ground contact. Keep the spring in its original packaging until installation to protect the anti-corrosion coating. Avoid stacking heavy objects on top of the spring, as this can introduce pre-stress deformation before the part is even installed.

Ready to Secure Your Supply of Rear Leaf Spring WG9725520289?

Your trucks cannot afford downtime, and your customers cannot afford delays. Get factory-direct pricing, fast delivery, and verified OEM-quality on the Rear Leaf Spring WG9725520289 Sinotruk by reaching out to our team today.

Contact Mettlead Now to request a quote, confirm fitment for your fleet, or discuss bulk order terms. Our specialists respond within 24 hours with pricing and availability.

Looking for more Sinotruk components? Browse our complete Sinotruk Truck Parts catalog for chassis, engine, transmission, and body parts—all available at competitive wholesale prices with global shipping.