Product Introduction

This U-bolt is a heavy-duty fastening component designed for heavy-duty truck suspension systems. It features a U-shaped, high-strength steel bolt with a black anti-corrosion coating, paired with two precision-threaded hexagonal nuts. The robust design ensures secure clamping of suspension components under extreme loads and harsh operating conditions.

Performance

• Manufactured from high-grade alloy steel for exceptional tensile strength and resistance to shear forces.

• The black anti-corrosion coating provides long-term protection against rust and environmental damage, extending service life.

• Precision threads ensure a secure, uniform clamping force, preventing loosening under 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 suspension systems, securely clamping leaf springs to the axle housing.

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

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

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

U-bolt AZ9925520028 Sinotruk – Heavy-Duty Suspension Fastener for HOWO & SITRAK Trucks

When your heavy-duty truck suspension demands uncompromising clamping force, the U-bolt AZ9925520028 Sinotruk delivers exactly that. Engineered specifically for Sinotruk’s flagship platforms, this U-bolt secures rear axle leaf spring assemblies with precision and durability that withstands the most punishing road conditions. Whether you’re sourcing for fleet maintenance, new vehicle assembly, or aftermarket distribution, Mettlead supplies this genuine-spec component at competitive factory-direct pricing with fast, reliable global delivery.

Key Features & Benefits of U-bolt AZ9925520028

Superior Material Strength

Manufactured from high-strength alloy steel, this U-bolt AZ9925520028 Sinotruk component resists fatigue cracking and deformation even under continuous heavy payloads. As a result, it maintains consistent clamping pressure throughout its service life, reducing the risk of leaf spring loosening during operation.

Anti-Corrosion Black Coating

A professionally applied black surface treatment protects the U-bolt against rust, road salt, moisture, and chemical exposure. Consequently, trucks operating in humid, tropical, or winter-salted environments benefit from significantly extended component longevity.

Precision-Threaded Hexagonal Nuts

Each U-bolt AZ9925520028 ships with two matched hexagonal nuts featuring precision-rolled threads. This ensures uniform torque distribution during installation, which in turn prevents uneven stress concentration and thread stripping.

OEM-Spec Dimensional Accuracy

Every dimension—thread pitch, leg spacing, bend radius, and overall length—matches Sinotruk’s original equipment specifications. Therefore, installation is straightforward with no modifications required, saving your workshop valuable labor time.

Cost-Effective Procurement

By sourcing directly from Mettlead’s China-based supply chain, procurement managers gain access to factory-direct pricing without sacrificing quality. Moreover, our flexible MOQ and bulk order discounts make large-scale fleet maintenance programs significantly more economical.

Technical Specifications – U-bolt AZ9925520028 Sinotruk

Application Scenarios for U-bolt AZ9925520028

This U-bolt AZ9925520028 Sinotruk component is specifically designed to serve multiple critical roles across the Sinotruk heavy truck platform family:

• Compatible Vehicle Models: Sinotruk HOWO A7, HOWO T7H, SITRAK C7H, SITRAK G7, and related heavy-duty chassis platforms.
• Primary Function: Securely clamps and fastens rear axle leaf spring packs to the axle housing, maintaining proper suspension geometry under full payload.
• New Vehicle Assembly: Used in OEM production lines for initial truck assembly, ensuring factory-standard suspension integrity from day one.
• Replacement & Maintenance: Ideal for scheduled maintenance programs where U-bolts require periodic replacement due to fatigue, corrosion, or torque loss after extended service intervals.
• Chassis Repair: Essential during major undercarriage overhauls, axle replacements, or accident damage repairs where suspension components must be fully disassembled and reassembled.

For more Sinotruk chassis and suspension components, explore our complete Chassis Parts Category or browse the full Sinotruk HOWO Truck Parts catalog.

OEM/ODM Capability

Mettlead brings over 10 years of experience in supplying Chinese brand truck parts to global markets. Here’s what sets our manufacturing and supply partnership apart:

• White-Label & Custom Packaging: We offer neutral packaging or fully customized branding solutions, allowing distributors and wholesalers to market under their own labels seamlessly.
• Strict Quality Control: Every batch of U-bolt AZ9925520028 undergoes dimensional inspection, material hardness testing, and surface coating thickness verification before shipment.
• Flexible Order Quantities: Whether you need a trial order of 50 pieces or a container-load of 10,000+ units, our production capacity adapts to your procurement schedule.
• Fast & Reliable Delivery: With ready stock for popular part numbers and efficient logistics partnerships, we consistently meet tight delivery windows.
• Factory Visit Welcome: Procurement teams are invited to inspect our facilities, audit quality processes, and build long-term supply confidence in person.

Additionally, you can explore our comprehensive Sinotruk Truck Parts page to discover the full range of components we supply across all major systems.

Frequently Asked Questions – U-bolt AZ9925520028 Sinotruk

What is the exact function of U-bolt AZ9925520028 in the suspension system?

The U-bolt AZ9925520028 clamps the leaf spring pack firmly against the rear axle seat. In other words, it acts as the primary fastener that prevents lateral and vertical movement of the spring assembly, ensuring the axle stays aligned under heavy loads.

Is this U-bolt AZ9925520028 an original Sinotruk specification part?

Yes. This U-bolt is manufactured to match Sinotruk’s OEM dimensional and material specifications precisely. As a result, it fits directly onto HOWO, T7H, and SITRAK models without any modification or adapter requirements.

How often should U-bolt AZ9925520028 be replaced on heavy-duty trucks?

Industry best practice recommends inspecting U-bolts every 50,000–80,000 km and replacing them if any signs of elongation, thread damage, or corrosion are detected. Furthermore, U-bolts should always be replaced in complete sets (per axle) to maintain even clamping force distribution.

Can I reuse the hexagonal nuts that come with U-bolt AZ9925520028?

We strongly recommend installing fresh nuts with each new U-bolt. Over time, repeated torque cycles can deform nut threads, which may compromise clamping integrity. Fortunately, each U-bolt AZ9925520028 from Mettlead includes two new matched nuts.

What torque specification should be applied during installation?

Follow Sinotruk’s official workshop manual torque values for your specific model. Generally, rear axle U-bolts on HOWO-class trucks require torque in the range of 450–550 N·m. Always use a calibrated torque wrench and tighten in a cross-pattern sequence for uniform load distribution.

Does the black coating affect thread engagement or nut fitment?

Not at all. The anti-corrosion coating is applied at a controlled thickness that does not interfere with thread engagement. In fact, the coating actually reduces galling during initial tightening, making installation smoother.

Request Your Quote Today

Ready to secure competitive pricing on U-bolt AZ9925520028 Sinotruk for your next order? Mettlead’s dedicated team responds to inquiries within 24 hours with detailed quotations, lead times, and shipping options tailored to your destination.

Simply Contact Us with your required quantity, preferred packaging, and delivery address. Let’s build a reliable parts supply partnership that keeps your fleet—and your business—moving forward.