Product Introduction

Structure

This leaf spring single plate is a precision-formed high-strength steel component designed for heavy-duty truck leaf spring suspension systems. It features a long, flat profile with a slight camber, precision-cut edges, and a central mounting hole for installation. The ends are formed into cylindrical spring eyes for pivot connection, and the surface is finished with a dark anti-corrosion coating. Markings such as “16X90” and part numbers are clearly visible for easy identification and traceability.

Performance

Manufactured from premium-grade spring steel (e.g., 60Si2Mn) and subjected to controlled heat treatment, this single plate delivers exceptional tensile strength, fatigue resistance, and consistent spring rate. It is designed 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.

Core Function

1. Serves as a primary load-bearing element within the leaf spring assembly, contributing to the overall spring rate and load capacity of the suspension system.

2. Works in conjunction with other leaf plates to absorb and dissipate road impacts and vibrations, ensuring a smooth, stable ride.

3. Maintains proper suspension geometry, preventing excessive deflection and ensuring consistent vehicle handling and stability.

4. Enhances vehicle safety and durability by providing a robust, reliable load-bearing solution that can withstand the extreme conditions of heavy-duty operation, reducing the risk of component failure and improving overall reliability.

Leaf Spring Single Plate WG9731520041-1 Sinotruk – Heavy-Duty Suspension Component for HOWO Trucks

When your heavy-duty truck’s suspension system demands a reliable replacement, the Leaf Spring Single Plate WG9731520041-1 Sinotruk delivers exactly what you need. Engineered from high-strength steel with precision forming, this single-plate leaf spring restores ride stability, load-bearing capacity, and road safety to your Sinotruk HOWO fleet. As a factory-direct supplier, Mettlead brings you genuine-spec components at competitive pricing — so you can keep your trucks running without breaking your budget.

Key Features and Benefits of the WG9731520041-1 Leaf Spring Single Plate

This isn’t just another suspension part sitting on a shelf. Every detail of the WG9731520041-1 leaf spring single plate is purpose-built to handle the punishing demands of heavy-duty trucking. Here’s what sets it apart:

• High-Strength Steel Construction: Manufactured from premium-grade spring steel, this single plate withstands extreme loads and repetitive stress cycles without permanent deformation.
• Precision-Formed Camber Profile: The carefully calibrated curvature ensures optimal load distribution across the suspension assembly, promoting even tire wear and stable handling.
• Cylindrical Spring Eyes: Both ends feature expertly formed spring eyes that provide smooth pivot connections, reducing friction and extending bushing life.
• Central Mounting Hole: A precisely drilled center bolt hole guarantees accurate alignment during installation, making replacement straightforward for your workshop team.
• Dark Anti-Corrosion Coating: A durable surface finish protects against rust, moisture, and road chemicals — extending service life even in harsh operating environments.
• Clear Part Identification: Visible markings including “16X90” and the OEM part number ensure easy traceability and prevent mix-ups in your parts inventory.
• Direct OEM Replacement: Designed to match original Sinotruk specifications, so installation is a bolt-on process with no modifications required.

In short, this leaf spring single plate keeps your trucks loaded, moving, and profitable — which is exactly what your fleet operation needs.

Application Scenarios – Where Does This Leaf Spring Fit?

The Leaf Spring Single Plate WG9731520041-1 is specifically engineered for the rear suspension systems of Sinotruk heavy-duty trucks. However, its applications extend across several real-world scenarios:

Compatible Vehicle Models

• Sinotruk HOWO heavy-duty trucks (various axle configurations)
• Sinotruk HOWO A7 series
• Sinotruk SITRAK series (verify part cross-reference)
• Other CNHTC-platform vehicles using the WG9731520041 leaf spring assembly

When Should You Replace This Component?

Leaf springs don’t last forever — especially under heavy payloads and rough road conditions. You should consider replacing the single plate when you notice:

• Visible Cracks or Fractures: A cracked leaf spring plate is a serious safety hazard. Even hairline fractures compromise load capacity and can lead to sudden failure.
• Sagging or Loss of Camber: When the plate loses its designed curvature, the truck sits unevenly, causing accelerated tire wear and poor handling.
• Aging and Fatigue: Years of cyclic loading cause metal fatigue. If your truck has logged high mileage without spring replacement, preventive replacement avoids costly roadside breakdowns.
• Corrosion Damage: Severe surface rust weakens the steel cross-section, reducing the plate’s effective load rating.

Replacing a worn or broken leaf spring single plate promptly protects your cargo, your driver, and your delivery schedule. Browse more chassis and suspension components to keep your fleet in top condition.

Technical Specifications

Accurate specifications matter when you’re sourcing parts for a mixed fleet. The table below provides the key parameters for the WG9731520041-1 Sinotruk leaf spring single plate:

Need to cross-reference this part with other Sinotruk components? Visit our complete Sinotruk truck parts catalog for full compatibility information.

OEM/ODM Capability – Tailored to Your Business Needs

At Mettlead, we understand that every market has unique requirements. That’s why we offer flexible manufacturing and branding solutions for the WG9731520041-1 leaf spring single plate and our entire product range:

• White-Label Packaging: Sell under your own brand with professional neutral packaging — ideal for distributors building regional brand equity.
• Custom Packaging: We produce packaging with your logo, part numbers, and branding guidelines to create a seamless customer experience.
• Strict Quality Control: Every leaf spring plate undergoes hardness testing, dimensional inspection, and surface quality checks before shipment. We don’t cut corners on QC.
• Bulk Order Flexibility: Whether you need 50 pieces or 5,000, our production capacity scales to match your procurement cycle.
• Factory Visits Welcome: We invite procurement managers to visit our facility, inspect production lines, and verify quality systems firsthand.

Explore our full range of Sinotruk HOWO truck parts and spare parts to consolidate your sourcing with one trusted supplier.

Frequently Asked Questions – Leaf Spring Single Plate WG9731520041-1

What is the exact cross-section size of this leaf spring single plate?

The WG9731520041-1 leaf spring single plate measures 16 mm in thickness and 90 mm in width, as indicated by the “16X90” marking on the component. This cross-section is specifically designed to handle the load requirements of Sinotruk HOWO rear suspension assemblies.

How can I tell if my leaf spring single plate needs replacement?

Look for visible signs such as surface cracks, loss of camber (the plate appears flat or inverted), heavy corrosion that has reduced material thickness, or uneven truck stance when loaded. Additionally, if you hear clunking noises from the rear suspension during driving, a fractured or fatigued leaf spring plate is often the culprit.

Is this leaf spring plate a direct fit for my Sinotruk HOWO truck?

Yes. The WG9731520041-1 is manufactured to OEM dimensional and material specifications for Sinotruk HOWO heavy-duty trucks. It installs directly into the existing leaf spring pack without any drilling, cutting, or modification. Simply match the part number to your truck’s service manual to confirm compatibility.

What material is used, and how does it resist fatigue?

This single plate is made from high-strength spring steel that has been heat-treated to achieve optimal hardness and elasticity. Spring steel is specifically chosen for its ability to absorb repeated flexing cycles without cracking — which is exactly what a leaf spring does millions of times over its service life. The anti-corrosion coating adds another layer of protection against environmental degradation.

Can I order just one plate, or do I need to buy the full leaf spring assembly?

You can order individual single plates. This is particularly useful when only one plate in your leaf spring pack has failed, saving you the cost of replacing the entire assembly. However, if multiple plates show wear, replacing the full pack is recommended for balanced suspension performance.

How should I store leaf spring plates before installation?

Store them in a dry, covered area away from direct moisture and ground contact. Although the anti-corrosion coating provides protection, prolonged exposure to standing water or high humidity can still initiate surface rust over time. Keep them on a rack or pallet, ideally in their original packaging.

Ready to Source Your Leaf Spring Single Plate WG9731520041-1?

Getting the right parts at the right price shouldn’t be complicated. At Mettlead, we make it simple: factory-direct pricing, fast lead times, and a dedicated team that understands heavy truck parts inside and out.

Here’s how to move forward:

1. Send us your inquiry — include the part number WG9731520041-1, your required quantity, and destination country.
2. Receive a competitive quote — we typically respond within 24 hours with pricing, lead time, and shipping options.
3. Confirm and ship — flexible payment methods and reliable logistics get your parts to your warehouse fast.

Whether you need this single leaf spring plate or a full container of Sinotruk suspension components, we’re ready to support your business.

Contact us now to request a quote — let’s get your trucks back on the road.