Product Introduction

Structure

This leaf spring pressure block is a precision-cast ductile iron component designed for heavy-duty truck leaf spring suspension systems. It features a robust, semi-oval body with eight evenly spaced mounting holes (four in the top row, four in the bottom row) for secure attachment. The surface is embossed with identification markings (including “AD”, “82800”, and “AZ9925520366”) for easy recognition and traceability, and the entire component is finished with a glossy dark gray anti-corrosion coating.

Performance

Constructed from high-grade ductile iron, this pressure block offers exceptional structural rigidity, impact resistance, and fatigue strength, capable of withstanding the extreme loads and stresses encountered in heavy-duty operation. The precision-machined mounting holes ensure accurate alignment and secure attachment, while the semi-oval shape is optimized for uniform load distribution across the leaf spring. The anti-corrosion coating provides superior protection against rust, salt spray, and chemical corrosion, ensuring long-term durability in diverse operating conditions, with a temperature range of -40°C to 120°C.

Core Function

1. Serves as a critical load-bearing and clamping component in leaf spring suspension systems, distributing clamping force evenly across the spring leaves and maintaining their alignment and structural integrity.

2. Transmits and distributes complex loads such as vertical pressure, lateral torque, and longitudinal impact from the leaf spring to the chassis, maintaining the integrity of the suspension system.

3. Maintains precise alignment of the leaf spring leaves, preventing relative displacement under dynamic conditions such as vehicle acceleration, braking, and turning, avoiding abnormal wear of suspension parts.

Leaf Spring Pressure Block WG9925520366 – Genuine Sinotruk Chassis Component

When your heavy-duty truck tackles unforgiving roads under full payload, every single chassis component matters. The Leaf Spring Pressure Block WG9925520366 is a critical fastening element designed to secure the leaf spring assembly on Sinotruk HOWO and SITRAK heavy trucks. Built to absorb tremendous driving loads and maintain stable suspension geometry, this pressure block ensures your fleet stays on the move — safely and reliably.

At Mettlead, we supply this OEM-referenced part directly from trusted Chinese factories, which means you get factory-direct pricing without sacrificing quality. Whether you are maintaining a single vehicle or replenishing stock for an entire workshop, this page gives you everything you need to make a confident purchasing decision.

Key Features and Benefits of the WG9925520366 Pressure Block

Understanding why this particular pressure block outperforms generic alternatives starts with its engineering purpose. Here is what sets it apart:

• Precision-Machined Dimensions – Manufactured to exact OEM tolerances, ensuring a perfect fit between the leaf spring pack and the axle seat without excessive play or misalignment.
• High-Strength Material – Forged from premium-grade steel that resists deformation under continuous heavy loads, even during extended highway hauls or rough off-road conditions.
• Corrosion-Resistant Surface Treatment – A protective coating guards against rust and oxidation, extending the service life in humid, dusty, or salt-exposed environments.
• Load Distribution Optimization – The block evenly distributes clamping force across the leaf spring leaves, preventing localized stress points that can lead to premature spring fracture.
• Drop-In Replacement – Designed as a direct replacement for the original WG9925520366 part, so installation requires no modifications or special tooling.

In short, choosing this genuine-spec pressure block protects your suspension system, reduces unplanned downtime, and lowers your total cost of ownership over time.

Application Scenario: Where Does This Part Fit?

The Leaf Spring Pressure Block WG9925520366 is specifically engineered for the rear suspension assembly of Sinotruk heavy-duty vehicles. Here is how it functions in real-world operation:

• Compatible Vehicles – Fits Sinotruk HOWO, HOWO A7, SITRAK C7H, and other heavy-truck models equipped with multi-leaf spring rear suspension.
• Primary Function – Secures and clamps the leaf spring pack to the rear axle housing, preventing lateral and longitudinal movement during transit.
• Operating Conditions – Engineered to withstand continuous driving loads including braking torque, acceleration forces, and vertical impact from road irregularities.
• Maintenance Trigger – Should be inspected during routine suspension checks. Replace immediately if cracking, deformation, or excessive wear is detected to avoid cascading damage to U-bolts and spring leaves.

For a broader range of chassis and suspension components, browse our complete Chassis Parts Category.

Technical Specifications

Need to cross-reference this part with other Sinotruk components? Visit our dedicated Sinotruk Truck Parts hub for a comprehensive catalog.

OEM and ODM Capabilities

Mettlead understands that different markets have different needs. That is why we offer flexible manufacturing and branding services alongside our standard parts supply:

• White-Label Packaging – Receive parts in neutral boxes ready for your own branding, ideal for distributors building a regional aftermarket brand.
• Custom Packaging – We print your logo, part numbers, and barcodes directly on the packaging to streamline your warehouse operations.
• Strict Quality Control – Every batch undergoes dimensional inspection, hardness testing, and surface quality checks before shipment.
• Bulk Order Flexibility – Whether you need 50 pieces or 5,000, our factory partners scale production to match your demand cycles.
• Fast and Reliable Delivery – Established logistics partnerships ensure competitive shipping times to Africa, the Middle East, Southeast Asia, South America, and CIS countries.

Explore the full Sinotruk HOWO Parts Brand Page to discover more components we can supply under your brand.

Frequently Asked Questions

What exactly does a leaf spring pressure block do?

Think of it as the anchor between your leaf spring pack and the axle. The pressure block sits between the U-bolt clamp and the spring leaves, distributing clamping force evenly so the springs stay firmly seated on the axle pad. Without it — or with a worn one — the springs can shift, causing noise, uneven tire wear, and potential safety hazards.

How do I know if my WG9925520366 pressure block needs replacing?

Look for visible cracks, deformation, or uneven wear marks on the contact surfaces. Additionally, if you notice clunking noises from the rear suspension during braking or over bumps, the pressure block may have lost its clamping integrity. A quick visual inspection during routine U-bolt torque checks usually reveals the issue.

Is this pressure block compatible with other Sinotruk models beyond HOWO?

Yes. The WG9925520366 is used across several Sinotruk platforms including HOWO A7 and SITRAK series trucks that share the same rear suspension architecture. However, always confirm the OEM part number against your vehicle’s maintenance manual before ordering.

Can I install this pressure block without special tools?

Absolutely. Since it is a direct OEM replacement, standard workshop tools — a torque wrench, socket set, and jack stands — are all you need. Simply remove the U-bolts, swap the old block for the new one, and torque everything to factory specifications.

What is the expected service life of this component?

Under normal operating conditions and proper torque settings, the WG9925520366 pressure block typically lasts as long as the leaf spring assembly itself — often 200,000 km or more. Harsh operating environments or chronic overloading may reduce this lifespan, so periodic inspection is always recommended.

Ready to Order? Let’s Talk.

Securing the right parts at the right price keeps your fleet — and your business — moving forward. Whether you need a single piece for urgent maintenance or a bulk shipment for your warehouse, Mettlead is here to help.

• Factory-direct pricing with no middlemen
• Flexible, secure payment options
• Fast global shipping
• On-site factory visits welcome

Get your personalized quote today. Contact Us with your required quantity and destination, and our team will respond within 24 hours with pricing and lead time.