Product Introduction

Structure

This balance shaft bolt is a custom high-strength stepped fastener assembly exclusively engineered for heavy-duty truck balance shaft systems. It features a one-piece forged structure with a precision-machined stepped shank, a full-length high-precision threaded section, and an integrated cylindrical locating base at the bottom for axial positioning. The stepped design ensures precise fit with the balance shaft and leaf spring assembly, and the thread pitch strictly complies with OE specifications for reliable locking.

Performance

Forged from premium 42CrMo alloy steel and subjected to quenching and tempering heat treatment, the bolt achieves a tensile strength grade of 10.9 or above, with exceptional fatigue resistance and impact toughness to withstand extreme alternating loads. The zinc-plated passivation finish provides superior resistance to salt spray corrosion, gravel impact, and high-temperature oxidation, effectively preventing hydrogen embrittlement.

Core Function

1. Serves as the core fastening component for the balance shaft assembly, rigidly connecting the balance shaft, leaf spring, and axle bracket to ensure the integrity of the suspension system.

2. Transmits and bears complex loads such as vertical pressure, lateral torque, and longitudinal impact during vehicle operation, maintaining the precise positional relationship of the balance shaft.

3. Prevents relative displacement between the balance shaft and related components under dynamic conditions such as vehicle acceleration, braking, and turning, avoiding abnormal wear of suspension parts.

Balance Shaft Bolt WG9725520283+013 Sinotruk – OEM-Grade Fastener for Heavy-Duty Truck Chassis

When it comes to keeping your Sinotruk heavy-duty truck running safely on the road, every single fastener matters. The Balance Shaft Bolt WG9725520283+013 is a critical chassis component that secures the balance shaft assembly firmly in place, absorbing tremendous loads and vibrations during operation. Designed to meet original Sinotruk specifications, this bolt delivers the exact torque resistance and tensile strength your fleet demands. Whether you are restocking your warehouse or fulfilling urgent client orders, Mettlead supplies this genuine-spec fastener at competitive factory-direct pricing with reliable global delivery.

Explore our full range of Sinotruk HOWO Truck Parts or browse all available Chassis Components to complement your inventory.

Key Features and Benefits of Balance Shaft Bolt WG9725520283+013

This isn’t just another bolt sitting on a shelf. The Balance Shaft Bolt WG9725520283+013 Sinotruk is engineered to perform under extreme stress conditions that heavy trucks encounter daily. Here’s what sets it apart:

• OEM-Matched Specifications – Manufactured to match the original Sinotruk part number WG9725520283+013, ensuring perfect fitment without modification.
• High Tensile Strength – Built from premium-grade alloy steel, this balance shaft bolt withstands the constant dynamic loads transmitted through the suspension system.
• Corrosion-Resistant Surface Treatment – A protective coating guards against rust and environmental degradation, extending service life even in harsh operating conditions.
• Precision Thread Engineering – Threads are rolled (not cut) to improve fatigue resistance and ensure consistent clamping force over repeated tightening cycles.
• Wholesale-Ready Packaging – Available in bulk quantities with optional white-label or custom packaging to support your brand identity.

In other words, this bolt does exactly what your customers need it to do: hold the balance shaft assembly together reliably, mile after mile, load after load.

Application Scenario – Where Does This Bolt Go?

The Balance Shaft Bolt WG9725520283+013 is specifically designed to fasten the balance shaft assembly on Sinotruk heavy-duty trucks. The balance shaft (also called an equalizing beam) sits between the rear axles on tandem-axle configurations, distributing load evenly and allowing articulation over uneven terrain.

Compatible Vehicle Models

• Sinotruk HOWO A7 (6×4, 8×4 configurations)
• Sinotruk HOWO 371 / 375 / 380 heavy-duty tractor units
• Sinotruk HOWO dump trucks with tandem rear axle
• SITRAK C7H series heavy trucks
• Other Sinotruk models utilizing the WG9725520283+013 part number in their chassis BOM

Functional Role

This bolt secures the balance shaft bracket to the chassis frame, maintaining proper alignment of the rear suspension geometry. When a balance shaft bolt fails or loosens, it can lead to uneven axle loading, accelerated tire wear, suspension misalignment, and in severe cases, catastrophic structural failure. Therefore, using a bolt that meets OEM torque and material specifications is not optional — it is essential for operational safety.

For a comprehensive overview of all Sinotruk replacement parts we carry, visit our Sinotruk Truck Parts catalog page.

Technical Specifications

Note: Specifications are based on OEM reference data. If you require a specific dimensional drawing or material certification, our team can provide detailed documentation upon request.

OEM/ODM Capability – Tailored to Your Business Needs

At Mettlead, we understand that distributors and wholesalers have unique branding and packaging requirements. That’s precisely why we offer flexible OEM and ODM services for the Balance Shaft Bolt WG9725520283+013 Sinotruk and our entire product catalog.

What We Offer

• White-Label Packaging – Receive products in neutral packaging, ready for your own branding and labeling.
• Custom Packaging Design – We can print your logo, part numbers, and brand colors directly on the packaging to strengthen your market presence.
• Strict Quality Control – Every batch undergoes dimensional inspection, material hardness testing, and surface treatment verification before shipment.
• Flexible Order Quantities – Whether you need a trial order or container-load volumes, we accommodate your purchasing cycle.
• Complete Documentation – Packing lists, commercial invoices, certificates of conformity, and material test reports are available as needed.

Additionally, because we supply the full range of Chinese truck brands — including SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON — you can consolidate multiple part numbers into a single shipment, reducing your logistics costs significantly.

Frequently Asked Questions About Balance Shaft Bolt WG9725520283+013

What exactly does the Balance Shaft Bolt WG9725520283+013 do?

This bolt fastens the balance shaft (equalizing beam) to the chassis bracket on Sinotruk tandem-axle trucks. It bears significant shear and tensile loads as the suspension articulates, so it must meet strict strength and fatigue requirements to prevent loosening or fracture under load.

Is this Balance Shaft Bolt an original Sinotruk part or aftermarket?

We supply OEM-specification aftermarket parts manufactured to match the original Sinotruk part number WG9725520283+013. The material grade, dimensions, thread pitch, and surface treatment replicate the factory original, ensuring direct drop-in replacement without any fitment issues.

What strength grade is the WG9725520283+013 bolt?

This balance shaft bolt is manufactured to Grade 10.9 high-tensile specification, which means it offers a minimum tensile strength of approximately 1,040 MPa. This grade is standard for critical chassis fasteners on heavy commercial vehicles.

How can I tell if my balance shaft bolts need replacement?

Common signs include visible thread damage or stretching, rust or pitting on the bolt shank, loss of torque (bolt feels loose during inspection), unusual clunking noises from the rear suspension, or uneven tire wear on the rear axles. If any of these symptoms appear, inspect and replace the bolts immediately.

Can I use a generic bolt instead of the WG9725520283+013?

We strongly advise against it. Generic hardware store bolts typically lack the precise material composition, heat treatment, and thread geometry required for this safety-critical application. Using an incorrect bolt can lead to premature failure, suspension damage, or even accidents. Always use the correct OEM-spec part number.

What is the recommended torque value for installing this bolt?

Torque specifications vary by specific truck model and assembly position. Generally, Grade 10.9 bolts of this size range require torque values between 280–450 Nm, but you should always refer to the Sinotruk workshop manual for the exact figure applicable to your vehicle configuration.

Do you offer bulk pricing for the Balance Shaft Bolt WG9725520283+013?

Absolutely. As a factory-direct supplier, Mettlead offers tiered wholesale pricing based on order volume. The larger your order, the more competitive your per-unit cost becomes. Contact us with your required quantity for a custom quotation.

Ready to Stock the Balance Shaft Bolt WG9725520283+013 Sinotruk?

Your customers depend on you for reliable, correctly-specified parts — and you can depend on Mettlead to deliver them. With factory-direct pricing, strict quality control, fast global shipping, and flexible payment options, we make it simple for wholesalers and distributors to maintain profitable inventory levels.

Here’s how to get started:

1. Request a Quote – Tell us your required quantity and delivery destination.
2. Receive Your Offer – We’ll respond with competitive pricing, lead time, and shipping options within 24 hours.
3. Place Your Order – Enjoy secure payment methods and transparent order tracking.

Don’t let your shelves run empty on high-demand chassis fasteners. Contact Mettlead today to request wholesale pricing on the Balance Shaft Bolt WG9725520283+013 and other Sinotruk spare parts. We also welcome factory visits — come see our quality control process firsthand.

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