Product Introduction

This precision-engineered hexagon bolt is designed to provide a high-strength, vibration-resistant connection for heavy-duty commercial vehicle applications.

• Structure & Material: Made from high-grade alloy steel, it features a hexagonal head for tool access and a partially threaded shank. The surface is coated with a green zinc-phosphate layer for superior corrosion resistance and enhanced torque retention.

• Performance: Provides a secure, high-torque connection that resists loosening under heavy vibration and dynamic loads, ensuring critical vehicle components remain firmly attached.

• Durability: The hardened steel construction and corrosion-resistant coating withstand harsh operating conditions, including temperature fluctuations, moisture, and road debris, ensuring long service life.

• Compatibility: Direct OE replacement, fully matching the thread specification, length, and torque requirements of the target vehicle’s original bolts.

Core Function

1. Structural Fastening: Secures heavy-duty components such as transmission housings, clutch assemblies, and chassis brackets to the vehicle frame.

2. Vibration Resistance: Maintains a tight, reliable connection even under the high vibration and dynamic loads of commercial vehicle operation.

3. Corrosion Protection: The zinc-phosphate coating prevents rust and degradation, ensuring the bolt remains serviceable in harsh environments.

Hexagon Bolt AZ9003801058 – SINOTRUK HW Series Gearbox Fastener

When it comes to keeping your SINOTRUK HW Series Gearbox running smoothly, every single fastener matters. The Hexagon Bolt AZ9003801058 is a critical transmission component that ensures structural integrity under extreme torque and heavy-duty operating conditions. At Mettlead, we supply this genuine-spec gearbox bolt directly from our factory in China, which means you get unbeatable pricing without compromising on quality. Whether you’re maintaining a fleet or stocking your parts warehouse, this bolt delivers the reliability your operations demand.

Why Choose the Hexagon Bolt AZ9003801058 for Your SINOTRUK Gearbox?

This isn’t just any bolt — it’s a precision-engineered fastener designed specifically for the demanding environment inside a heavy-duty truck transmission. Here’s what makes it stand out:

• Perfect OEM Fitment: Manufactured to match the original SINOTRUK specifications, the AZ9003801058 hexagon bolt drops right into your HW Series Gearbox without any modification needed.
• High-Strength Material: Crafted from premium-grade alloy steel, this bolt withstands the constant vibration, heat cycling, and torque loads that gearbox components endure daily.
• Corrosion-Resistant Finish: A protective surface treatment extends service life, even in humid or harsh climatic conditions frequently encountered in mining, construction, and long-haul transport.
• Reliable Clamping Force: Consistent thread precision ensures proper preload, preventing loosening that could lead to costly gearbox failures down the road.
• Cost-Effective Maintenance: By sourcing directly from Mettlead’s factory, you significantly reduce per-unit costs while maintaining the exact quality standard your trucks require.

In short, choosing this hexagon bolt means choosing fewer breakdowns, longer service intervals, and ultimately a lower total cost of ownership for your fleet.

Technical Specifications – Hexagon Bolt AZ9003801058

Accuracy matters when you’re sourcing gearbox fasteners. Below you’ll find the detailed parameters for this SINOTRUK HW Series Gearbox hexagon bolt:

Application Scenarios – Where Does This Bolt Fit?

The Hexagon Bolt AZ9003801058 is specifically engineered for the SINOTRUK HW Series Gearbox, one of the most widely used heavy-duty transmissions across global markets. More specifically, this fastener serves in the following scenarios:

• SINOTRUK HOWO Heavy-Duty Trucks: Used in the HW19710, HW19712, and other HW series transmission assemblies.
• SITRAK C7H / T7H Series: Vehicles equipped with HW gearbox variants rely on this bolt for secure housing assembly.
• Mining and Construction Dump Trucks: Extreme vibration environments where gearbox bolt integrity is non-negotiable.
• Long-Haul Logistics Fleets: High-mileage applications where consistent bolt preload prevents premature gearbox wear.

If your vehicle uses a SINOTRUK HW Series transmission, this hexagon bolt is the exact replacement part you need. For a broader selection of compatible components, browse our full range of gearbox parts and SINOTRUK HOWO gearbox parts.

OEM/ODM Capability and Custom Packaging

At Mettlead, we understand that different markets have different requirements. That’s why we offer flexible solutions tailored to your business needs:

• White-Label Packaging: Want to sell under your own brand? We provide neutral or custom-branded packaging for the Hexagon Bolt AZ9003801058, giving you full brand control in your local market.
• Custom Labeling and Kitting: If you need specific labels, barcodes, or bundled kits for your workshop customers, our team can accommodate those requests.
• Strict Quality Control: Every batch of hexagon bolts passes through rigorous inspection — including dimensional checks, hardness testing, and surface quality verification — before leaving our facility.
• Bulk Order Flexibility: Whether you need 100 pieces or 100,000 pieces, our production capacity scales to match your demand without sacrificing lead times.

We’re not just a parts supplier — we’re your manufacturing partner. Explore more of our SINOTRUK HOWO truck parts catalog to discover the full breadth of what we offer.

Customer Case Study – Hexagon Bolt AZ9003801058 in Action

Earlier this year, a fleet maintenance company based in East Africa reached out to us with an urgent problem. They were managing over 200 SINOTRUK HOWO dump trucks used in road construction projects, and several units were experiencing recurring gearbox housing looseness. After investigation, they discovered that substandard aftermarket hexagon bolts were failing under load.

They placed an initial order of 5,000 units of the Hexagon Bolt AZ9003801058 from Mettlead. Within five working days, the shipment arrived at their warehouse. After replacing the faulty bolts across their fleet, they reported zero recurrence of the gearbox loosening issue over the following six months. Moreover, the factory-direct pricing saved them approximately 35% compared to their previous local supplier.

Today, this client reorders every quarter and has expanded their purchase list to include additional SINOTRUK HW Series Gearbox components. This is what happens when quality meets value — and it’s the kind of partnership we build with every customer who works with Mettlead.

Frequently Asked Questions – Hexagon Bolt AZ9003801058

What is the exact application of the Hexagon Bolt AZ9003801058?

This hexagon bolt is specifically designed for use in the SINOTRUK HW Series Gearbox. It secures critical transmission housing components and is subject to high torque and vibration loads during normal operation. Therefore, using the correct OEM-spec bolt like the AZ9003801058 is essential for transmission longevity.

Is this bolt an original SINOTRUK part or an aftermarket replacement?

Mettlead supplies OEM-equivalent quality bolts that are manufactured to the same dimensional and material specifications as the original. They are fully interchangeable with genuine SINOTRUK parts, and every batch undergoes strict quality control testing to verify hardness, tensile strength, and thread accuracy.

What strength grade is the Hexagon Bolt AZ9003801058?

This bolt is manufactured at Grade 10.9 strength, which provides the high tensile and yield strength necessary for heavy-duty gearbox applications. Grade 10.9 ensures the bolt maintains its clamping force even under significant thermal expansion and mechanical stress.

Can I use this bolt on non-SINOTRUK gearboxes?

While the AZ9003801058 is designed for the SINOTRUK HW Series Gearbox, it may technically fit other transmissions that share the same bolt dimensions and thread specifications. However, we strongly recommend verifying part number compatibility before cross-application to avoid potential fitment or torque issues.

What is the recommended torque specification for installation?

You should always follow the torque values specified in the SINOTRUK HW Series Gearbox service manual for this particular bolt position. Over-torquing can stretch the bolt beyond its yield point, while under-torquing may result in loosening during operation. If you need guidance, feel free to consult our technical team.

How should I store these hexagon bolts to prevent corrosion?

Although the AZ9003801058 features a corrosion-resistant coating, it’s best practice to store them in a dry, climate-controlled environment away from direct moisture or chemical exposure. Keeping them in their original sealed packaging until installation will maximize shelf life and surface integrity.

Ready to Secure Your Supply? Get a Quote Now

Stop overpaying for gearbox fasteners through middlemen. With Mettlead, you source the Hexagon Bolt AZ9003801058 for SINOTRUK HW Series Gearbox directly from the factory — at lower prices, with faster delivery, and backed by rigorous quality assurance.

Here’s what you can expect when you work with us:

1. Competitive Factory-Direct Pricing — No unnecessary markups from third-party distributors.
2. Fast and Reliable Global Shipping — In-stock items ship within 3–7 working days.
3. Flexible and Secure Payment Methods — We accommodate your preferred terms.
4. Complete Parts Catalog — SINOTRUK, SHACMAN, FAW, WEICHAI, DONGFENG, FOTON and more, all from one source.
5. Factory Visits Welcome — We invite you to inspect our facilities in person.

Whether you need a sample batch or a large-volume annual contract, our team is ready to support you. Contact us today to request pricing, confirm stock availability, or discuss your custom packaging requirements. Let’s build a reliable supply chain together.