Product Introduction

This U-bolt is a heavy-duty fastening component specifically designed for the rear leaf spring suspension of heavy-duty trucks. It features a U-shaped, high-strength steel bolt with a durable anti-corrosion coating, paired with two precision-threaded hexagonal nuts. The robust construction ensures secure clamping of the rear leaf springs to the axle housing under extreme loads and harsh operating conditions.

Performance

• Manufactured from high-grade alloy steel for exceptional tensile strength and resistance to shear forces, making it suitable for heavy-duty rear suspension applications.

• The anti-corrosion coating provides long-term protection against rust, road salt, and environmental damage, extending the component’s service life.

• Precision-engineered threads ensure a secure, uniform clamping force, preventing loosening under constant vibration and dynamic stress.

• Operates reliably in temperatures ranging from -40°C to 120°C, suitable for all heavy-duty operating conditions.

Core Function

1. Serves as a critical fastening component in the rear leaf spring suspension system, securely clamping the leaf springs to the axle housing.

2. Transmits and distributes suspension loads evenly across the rear axle, maintaining proper axle alignment and vehicle stability.

3. Withstands extreme loads generated by heavy payloads, off-road conditions, and dynamic suspension movement.

4. Contributes to overall vehicle safety and reliability by preventing component separation and maintaining the integrity of the rear suspension system.

U-Bolt For Rear Leaf Spring WG9112520312 – Genuine Sinotruk Heavy-Duty Fastener

When your heavy-duty truck faces punishing road conditions day after day, every fastener matters. The U-Bolt for Rear Leaf Spring WG9112520312 is a precision-engineered clamping solution built exclusively for Sinotruk heavy-duty platforms. Manufactured from high-strength steel with a durable anti-corrosion surface treatment, this U-bolt delivers the reliable axle-to-spring clamping force that keeps your rear suspension intact — even under maximum payload. As a factory-direct supplier with over 10 years of experience, Mettlead ensures you receive authentic-quality parts at competitive pricing with fast, dependable delivery worldwide.

Key Features & Benefits of the WG9112520312 U-Bolt

Understanding what sets this U-bolt apart helps you make a confident purchasing decision. Here’s why fleet managers and procurement professionals trust this component:

• Premium High-Strength Steel Construction: Forged from carefully selected alloy steel, this U-bolt withstands extreme tensile loads without deformation, ensuring long-term clamping integrity on the rear axle assembly.
• Advanced Anti-Corrosion Coating: A multi-layer surface treatment resists rust, road salt, and chemical exposure — extending service life significantly compared to uncoated alternatives.
• Precision-Threaded Hexagonal Nuts Included: Each U-bolt ships with two matched hex nuts featuring fine-pitch threads, providing uniform torque distribution and vibration resistance during operation.
• OEM-Equivalent Dimensional Accuracy: Manufactured to exact Sinotruk OEM specifications (part number WG9112520312), guaranteeing a perfect fit without modification during installation.
• Reduced Downtime & Maintenance Costs: The robust design minimizes the frequency of re-torquing and replacement, which translates directly into lower total cost of ownership for your fleet.
• Strict Quality Control: Every batch undergoes hardness testing, dimensional inspection, and surface coating thickness verification before shipment.

Technical Specifications – U-Bolt WG9112520312 Sinotruk

Below you’ll find the detailed technical parameters for this rear leaf spring U-bolt. These specifications are critical for verifying fitment and ensuring compatibility with your specific vehicle configuration:

Application Scenarios – Where This U-Bolt Performs

This U-Bolt for Rear Leaf Spring WG9112520312 is specifically designed to serve across multiple critical applications in the Sinotruk heavy-duty truck ecosystem:

• Compatible Vehicle Models: Sinotruk HOWO, HOWO A7, T7H, SITRAK (Steer & Drive Axle Variants), and related CNHTC platforms.
• New Vehicle Assembly: Ideal for OEM production lines requiring consistent, high-volume supply of rear suspension fasteners.
• Replacement & Aftermarket Service: A direct drop-in replacement when existing U-bolts show signs of fatigue, corrosion, or thread damage during routine maintenance inspections.
• Chassis Overhaul & Repair: Essential during comprehensive rear axle rebuilds, leaf spring replacements, or suspension upgrades on aging fleet vehicles.

Whether you’re managing a logistics fleet in Africa, a mining operation in Southeast Asia, or a construction project in the Middle East, this U-bolt delivers the durability your trucks demand. Explore more compatible components in our Sinotruk HOWO Truck Parts catalog or browse our full Chassis Parts Category.

OEM/ODM Capability – Tailored to Your Business Needs

At Mettlead, we understand that different markets have different requirements. That’s precisely why we offer flexible manufacturing and branding solutions:

• White-Label Packaging: Receive U-bolts in neutral packaging, ready for your own brand labeling — perfect for distributors building a private-label parts business.
• Custom Packaging & Branding: We can produce parts with your company logo, part numbers, and packaging design for a fully branded customer experience.
• Bulk & Volume Pricing: As a factory-direct source, we eliminate middlemen. The more you order, the more competitive your per-unit cost becomes.
• Flexible MOQ: Whether you need a trial order of 50 pieces or a container load of 10,000+, our production line adapts to your procurement schedule.
• Quality Certification Support: We provide material test reports, hardness certificates, and dimensional inspection records upon request to satisfy your internal QC requirements.

For a comprehensive overview of all available Sinotruk components, visit our Sinotruk Truck Parts page.

Frequently Asked Questions – U-Bolt WG9112520312

What is the exact function of U-Bolt WG9112520312 in the rear suspension?

This U-bolt serves as the primary clamping fastener that secures the rear leaf spring pack to the axle housing. It wraps around the axle tube in a U-shape, and when the nuts are torqued to specification, it creates a rigid connection that prevents lateral and vertical movement of the spring relative to the axle. Without properly functioning U-bolts, the rear axle can shift under load, leading to dangerous handling instability.

What steel grade is used in this Sinotruk rear leaf spring U-bolt?

The WG9112520312 U-bolt is manufactured from high-strength alloy steel conforming to Grade 8.8 or 10.9 property class standards. This ensures a minimum tensile strength of 800–1,040 MPa, which is essential for withstanding the dynamic shock loads encountered in heavy-duty trucking applications.

How can I verify that this U-bolt fits my specific Sinotruk model?

The most reliable method is to cross-reference the OEM part number WG9112520312 against your vehicle’s parts catalog or VIN-based lookup system. This U-bolt is confirmed compatible with Sinotruk HOWO, T7H, and SITRAK rear axle configurations. If you’re uncertain, simply share your vehicle model and chassis number with our team, and we’ll confirm fitment within 24 hours.

Does the anti-corrosion coating affect torque specifications during installation?

No. The electrophoretic/zinc-plated coating is engineered to be thin enough (typically 8–15 microns) that it does not interfere with thread engagement or alter the friction coefficient significantly. You should still apply the manufacturer-recommended torque values and use a calibrated torque wrench for proper installation.

What are the signs that a rear leaf spring U-bolt needs replacement?

Watch for these warning indicators: visible rust penetration beyond surface patina, thread stripping or nut loosening despite re-torquing, elongation or bending of the U-bolt legs, cracking at the bend radius, or uneven tire wear suggesting axle misalignment. If any of these conditions are present, immediate replacement with a new WG9112520312 U-bolt is strongly recommended.

Can I order this U-bolt with custom thread lengths or diameters?

Yes. While the standard WG9112520312 matches OEM dimensions exactly, Mettlead’s ODM capability allows us to produce modified versions with adjusted leg lengths, thread pitches, or material upgrades for specialized applications. Contact our engineering team to discuss your custom requirements.

Ready to Secure Your Supply? Get a Quote Now

Every day without reliable parts in stock is a day your customers — and your revenue — are waiting. As a trusted factory-direct supplier with 10+ years of experience in Chinese heavy-duty truck parts, Mettlead delivers the U-Bolt for Rear Leaf Spring WG9112520312 Sinotruk with competitive pricing, strict quality assurance, and fast global shipping.

Here’s what happens when you reach out:

1. Submit your inquiry with quantity and destination details.
2. Receive a detailed quotation within 24 hours — including FOB/CIF pricing options.
3. Approve samples or proceed directly to bulk order with flexible payment terms.

Don’t let suspension failures cost your fleet time and money. Contact Us Today to request pricing, check stock availability, or discuss your custom packaging needs. Our team is standing by to support your next order.