Product Introduction

Structure

This front main leaf spring is a single-leaf parabolic spring assembly, precision-formed from high-strength spring steel. It features a long, slender parabolic profile that tapers from the center to the ends, with cylindrical eyelets at both ends for mounting to the chassis and axle. The eyelets are fitted with rubber bushings to provide a flexible, vibration-damping connection. The entire spring is coated with a black anti-corrosion finish to protect against rust and wear.

Performance

Crafted from premium 60Si2Mn spring steel and subjected to quenching and tempering heat treatment, this leaf spring delivers exceptional tensile strength, fatigue resistance, and elastic recovery. The parabolic design optimizes stress distribution, reducing weight while enhancing load-carrying capacity and ride comfort. It operates reliably in temperatures ranging from -40°C to 120°C, resisting permanent set and fracture under heavy loads and repeated flexing. The rubber bushings isolate road vibrations, improving driver comfort and reducing component wear.

Core Function

1. Supports the vehicle’s front axle and distributes the load evenly across the chassis, maintaining proper ride height and stability.

2. Absorbs and dampens road impacts and vibrations, providing a smooth, comfortable ride while protecting the chassis and cargo from damage.

3. Works in conjunction with other suspension components to maintain wheel alignment and tire contact with the road, enhancing handling, traction, and braking performance.

4. Enhances vehicle safety and durability by withstanding the extreme loads and stresses encountered in heavy-duty operation, reducing the risk of suspension failure and improving overall reliability.

Front Main Leaf Spring WG9725520072 Sinotruk – Heavy-Duty OEM Replacement

When your Sinotruk heavy truck hits the road loaded to capacity, every component in the suspension system earns its keep. The Front Main Leaf Spring WG9725520072 sits at the heart of that system, quietly absorbing punishing road shocks while carrying thousands of kilograms of payload. Engineered to OEM specifications, this leaf spring delivers the durability and ride stability that fleet operators and workshop managers demand — without the inflated price tag of dealership sourcing.

At Mettlead, we supply this genuine-spec front main leaf spring directly from our factory network in China, giving procurement managers a faster, more cost-effective path to keeping their Sinotruk fleets rolling. Whether you manage a logistics company in Africa, a mining operation in Southeast Asia, or a distribution fleet in the Middle East, this part is built to perform under the toughest conditions on earth.

Key Features and Benefits of the WG9725520072 Front Main Leaf Spring

Engineered for Maximum Load-Bearing Performance

This front main leaf spring is manufactured from high-grade alloy spring steel, heat-treated and shot-peened to resist fatigue cracking over millions of load cycles. It is purpose-built to bear the front axle load of Sinotruk heavy-duty trucks, distributing weight evenly across the chassis and preventing premature frame stress.

Superior Shock Absorption on Any Terrain

Road surfaces in many operating regions are far from perfect. Potholes, unpaved haul roads, and uneven terrain generate constant vertical impacts that punish suspension components. The WG9725520072 leaf spring flexes progressively under load, cushioning the cab and chassis from harsh vibrations. As a result, drivers experience less fatigue, and cargo stays better protected during transit.

Direct OEM Fitment — No Modifications Required

Dimensional accuracy matters when you are replacing a critical suspension part. This leaf spring matches the original Sinotruk factory blueprint for length, width, thickness, eye diameter, and arch height. That means it bolts directly into place with no drilling, trimming, or adapter brackets needed — saving your workshop valuable labor hours.

Extended Service Life Under Harsh Conditions

Thanks to its anti-corrosion surface treatment and optimized metallurgical composition, this leaf spring resists rust, pitting, and stress fractures even in humid, dusty, or salt-laden environments. Fleet operators consistently report service intervals that match or exceed OEM expectations.

Factory-Direct Pricing That Protects Your Margins

Because Mettlead sources directly from certified manufacturing facilities in China, we eliminate middlemen and pass the savings on to you. Bulk buyers and repeat customers benefit from competitive tiered pricing that keeps per-unit costs low — a critical advantage for procurement managers working within tight budgets.

Technical Specifications

Application Scenario

The Front Main Leaf Spring WG9725520072 is specifically designed to fit Sinotruk HOWO heavy-duty trucks. Installed on the front axle, it serves as the primary load-bearing and shock-dampening element of the front suspension assembly. In practical terms, this means it carries the weight of the loaded front axle while simultaneously cushioning the cab and frame against road surface impacts — from highway expansion joints to unpaved mining haul roads.

Typical applications include long-haul logistics trucks, construction site tippers, mining transport vehicles, and municipal utility trucks operating under Sinotruk platforms. If your fleet runs HOWO trucks in demanding environments, this leaf spring is the component that keeps the front end stable, predictable, and safe under load.

Looking for more Sinotruk chassis and suspension components? Browse our full Chassis Parts Category or explore the complete Sinotruk HOWO Parts Collection for everything from brake drums to cabin accessories.

OEM/ODM Capability

White-Label and Custom Packaging

Mettlead understands that distributors and resellers often need parts delivered under their own brand identity. We offer flexible white-label packaging as well as fully customized boxes, labels, and documentation. Whether you need neutral export cartons or retail-ready branded packaging, our team handles it seamlessly.

Strict Quality Control at Every Stage

Every WG9725520072 leaf spring passes through a multi-point inspection process before it leaves our facility. Dimensional checks, hardness testing, surface finish verification, and load simulation ensure that each piece meets the performance benchmarks your customers expect. We do not ship parts that fall outside tolerance — period.

Flexible Order Quantities

Whether you need a trial order of a few pieces or a container-load shipment for warehouse replenishment, our production capacity scales to match your demand. We work with procurement teams to align delivery schedules with your inventory planning, reducing both stockout risk and warehousing costs.

Factory Visits Welcome

Transparency builds trust. Mettlead welcomes international buyers to visit our partner factories in China, inspect production lines, and verify quality systems firsthand. If you prefer to see before you buy, we will arrange the visit for you.

Frequently Asked Questions

What trucks does the WG9725520072 front main leaf spring fit?

This leaf spring is designed as a direct replacement for Sinotruk HOWO heavy-duty trucks that use the OEM part number WG9725520072 on the front axle. It matches the original dimensions and load rating, so it installs without any modification to the mounting points or U-bolt spacing.

How can I tell if my front main leaf spring needs replacing?

Common signs include visible cracks or fractures in the leaf, excessive sagging of the front end under load, uneven tire wear on the front axle, and a noticeably rougher ride quality. If the spring eye bushings are worn out or the center bolt is sheared, replacement is also recommended rather than repair.

Is this an original Sinotruk part or an aftermarket replacement?

This is a high-quality aftermarket part manufactured to OEM specifications. It matches the original Sinotruk blueprint for material grade, dimensions, and performance characteristics. Many fleet operators choose aftermarket-spec parts like this because they deliver equivalent durability at a significantly lower cost per unit.

What material is the WG9725520072 leaf spring made from?

It is forged from high-grade alloy spring steel — typically 60Si2Mn or an equivalent specification — which offers an excellent balance of elasticity, tensile strength, and fatigue resistance. The surface is shot-peened to relieve stress concentrations and coated to resist corrosion in humid or salt-exposed environments.

Can I order just one piece, or is there a minimum order quantity?

Mettlead accommodates both sample orders and bulk purchases. For exact MOQ details and pricing tiers, please contact our sales team directly — we respond within 24 hours on business days.

How is the leaf spring packaged for international shipping?

Each leaf spring is individually wrapped in protective material and packed in a reinforced carton or wooden crate suitable for ocean freight, air cargo, or express courier. Custom packaging and branding are available upon request at no excessive additional cost.

Ready to Secure Your Supply of WG9725520072 Front Main Leaf Springs?

Getting a quote is simple. Tell us the quantity you need, your preferred shipping method, and your delivery timeline — our team will respond with a competitive offer within 24 hours. We handle export documentation, customs-friendly invoicing, and flexible payment terms so you can focus on running your business rather than chasing paperwork.

Contact Mettlead Now to request pricing, confirm fitment details, or arrange a factory visit. Let us become your reliable long-term source for Sinotruk truck parts.

You can also explore our full range of Sinotruk Truck Parts to find everything your fleet needs in one place — from engine components to chassis hardware and beyond.