Product Introduction

Structure

This front leaf spring bolt is a precision-formed high-strength U-bolt, featuring a U-shaped profile with two parallel, threaded legs. It is manufactured from premium-grade carbon steel or alloy steel, with a uniform diameter throughout the bend and legs. The entire component is coated with a silver-gray zinc or Dacromet finish, providing excellent corrosion resistance. The threaded ends are precision-cut to standard pitch, ensuring compatibility with corresponding nuts and washers for secure clamping.

Performance

Crafted from high-strength steel and subjected to controlled heat treatment, this U-bolt delivers exceptional tensile strength and fatigue resistance, capable of withstanding the extreme clamping forces required to secure heavy-duty truck leaf springs. The corrosion-resistant coating offers superior protection against rust, salt spray, and chemical exposure, ensuring long-term durability in diverse operating environments. It maintains its structural integrity in temperatures ranging from -40°C to 120°C, resisting hydrogen embrittlement and fracture under repeated loading and vibration.

Core Function

1. Securely clamps the front leaf spring assembly to the axle housing, maintaining proper alignment and load distribution between the spring and axle.

2. Transmits vertical and lateral loads from the leaf spring to the axle, ensuring stable suspension performance and vehicle handling.

3. Prevents lateral movement and shifting of the leaf spring under heavy loads and dynamic driving conditions, reducing the risk of component failure and improving safety.

Bolt For Front Leaf Spring WG9925520029 Sinotruk – OEM Quality, Factory Direct Price

When it comes to heavy-duty truck suspension, every single fastener matters. The Bolt For Front Leaf Spring WG9925520029 is a critical component that keeps your Sinotruk front leaf spring assembly securely fastened and properly aligned. Engineered to meet OEM specifications, this high-strength bolt ensures reliable clamping force under extreme loads, rough terrain, and constant vibration. Whether you’re maintaining a fleet or stocking your parts warehouse, sourcing this bolt from Mettlead means you get genuine-grade quality at a competitive factory-direct price.

As a trusted global supplier of Sinotruk truck parts, Mettlead delivers the exact part number you need — no guesswork, no compatibility headaches. Let’s dive into what makes this front leaf spring bolt a must-have for your inventory.

Features and Benefits of WG9925520029 Front Leaf Spring Bolt

This isn’t just any bolt. It’s purpose-built for the demanding environment of a heavy truck’s front suspension system. Here’s what sets it apart:

• OEM Part Number WG9925520029 – Guarantees a precise fit for Sinotruk HOWO and SITRAK heavy-duty trucks, eliminating the risk of incorrect sizing or thread mismatch.
• High-Tensile Strength Steel – Manufactured from premium alloy steel with appropriate heat treatment, this bolt withstands the enormous clamping loads required to secure front leaf spring packs.
• Corrosion-Resistant Surface Treatment – A protective coating guards against rust and oxidation, extending service life even in humid or salt-exposed operating environments.
• Vibration Resistance – Engineered thread geometry and material hardness help the bolt maintain preload under continuous road vibration, reducing the risk of loosening over time.
• Direct Replacement – Drops right into the original mounting position with no modifications needed, saving your workshop valuable labor time.
• Strict Quality Control – Every batch undergoes dimensional inspection, hardness testing, and surface quality checks before shipment.

In short, this bolt delivers the durability and precision that fleet operators and repair shops demand. It keeps the front leaf spring assembly tight, which in turn maintains proper steering geometry and ride stability.

Technical Specifications

Accurate specifications are essential when sourcing suspension fasteners. Below you’ll find the key parameters for the WG9925520029 Bolt For Front Leaf Spring:

Need to cross-reference this part number with your existing inventory system? Our team can provide dimensional drawings and material certificates upon request.

Application Scenario: Where Does This Bolt Work?

The WG9925520029 front leaf spring bolt is specifically designed for Sinotruk heavy-duty trucks, including the HOWO and SITRAK series. Its primary job is to fasten the front leaf spring assembly to the front axle spring seat, ensuring the entire suspension stack stays clamped together under load.

Here’s where you’ll typically find this bolt in action:

• Sinotruk HOWO A7 / T7H / T5G tractor heads – Long-haul highway operations where consistent suspension integrity is critical for driver comfort and tire wear.
• Sinotruk SITRAK C7H / C5H series – Premium heavy trucks operating on mixed road conditions that demand superior fastener reliability.
• HOWO dump trucks and mixer trucks – Construction and mining applications where extreme payload and rough terrain put maximum stress on front suspension components.

Over time, front leaf spring bolts can fatigue, corrode, or lose preload due to repeated loading cycles. Replacing them during scheduled maintenance prevents costly failures like spring pack shifting, uneven tire wear, or compromised steering response. For more chassis and suspension parts, browse our full catalog.

OEM/ODM Capability – White-Label and Custom Packaging

Mettlead understands that different markets have different branding needs. That’s why we offer flexible OEM and ODM services for our fastener range:

• White-Label Packaging – We supply parts in neutral packaging so you can apply your own brand identity for resale in your local market.
• Custom Packaging – Need specific box sizes, labels, or barcodes? We accommodate custom packaging requirements to streamline your warehouse operations.
• Bulk and Assortment Orders – Combine this bolt with other Sinotruk HOWO spare parts in a single shipment to reduce freight costs.
• Quality Documentation – Material test reports, hardness certificates, and dimensional inspection records are available for every batch.

Whether you’re a parts distributor, fleet maintenance company, or aftermarket retailer, our factory-direct model eliminates middlemen and keeps your procurement costs competitive.

Frequently Asked Questions

What is the function of the front leaf spring bolt WG9925520029?

This bolt serves as the primary fastener that clamps the front leaf spring pack together and secures it to the axle spring seat. It must withstand high tensile loads and constant vibration, which is why it’s manufactured from high-grade alloy steel with a minimum grade of 10.9.

How do I know if my front leaf spring bolt needs replacement?

Look for visible signs of corrosion, thread damage, elongation, or reduced clamping force. If you notice the front leaf spring pack shifting, hear clunking noises from the front suspension, or observe uneven tire wear, the bolt may have lost its preload and should be inspected immediately.

Is WG9925520029 compatible with all Sinotruk models?

This part number is designed for Sinotruk HOWO and SITRAK heavy-duty truck models that use the standard front leaf spring suspension configuration. However, because Sinotruk produces many variants, we recommend confirming the part number against your truck’s VIN or original parts catalog before ordering.

What torque specification should I use when installing this bolt?

Always follow the torque value specified in your Sinotruk workshop manual for the front leaf spring U-bolt or center bolt application. Over-torquing can cause bolt fatigue, while under-torquing leads to loosening. Using a calibrated torque wrench is essential for proper installation.

Can I order a small quantity for testing before placing a bulk order?

Absolutely. Mettlead offers flexible minimum order quantities so you can evaluate product quality before committing to larger volumes. Simply contact us with your requirements and we’ll arrange a sample or trial order.

How is the bolt packaged for international shipping?

By default, bolts are packed in protective neutral packaging to prevent damage during transit. If you need branded or custom packaging, just let us know during the quotation stage and we’ll accommodate your specifications.

Ready to Source Your WG9925520029 Front Leaf Spring Bolt?

Stop wasting time with unreliable suppliers and inconsistent quality. Mettlead gives you direct access to factory-fresh Sinotruk parts with strict quality control, competitive pricing, and fast delivery to your door — wherever you are in the world.

Here’s how to get started:

1. Send us your part number (WG9925520029) and required quantity.
2. Receive a detailed quotation within 24 hours.
3. Confirm your order with flexible, secure payment options.
4. Get your parts shipped quickly and reliably to your location.

Have questions or need to cross-reference additional part numbers? Our experienced parts specialists are ready to help. Contact us today and let’s get your order moving.