Product Introduction

This precision-engineered hollow bolt functions as both a structural fastener and a fluid passage, enabling secure mounting and pressure-tight fluid transfer in critical vehicle systems.

• Structure & Material:

• Material: High-strength alloy steel, heat-treated for tensile strength and pressure resistance.

• Head: Hexagonal head for wrench installation.

• Hole Design: Axial internal bore with a radial outlet hole, channeling fluid from the threaded port to the connected component.

• Finish: Zinc-plated (gold/yellow) for corrosion resistance and anti-seizing properties.

  • Performance:

• Provides a leak-free fluid path while maintaining a high-torque structural connection.

• Rated for system pressures up to 10–16 bar, ensuring reliable operation in heavy-duty braking and pneumatic systems.

  • Durability: The hardened steel construction and corrosion-resistant coating withstand vibration, temperature fluctuations, and fluid exposure, ensuring long service life.

Core Function

1. Fluid Passage: Acts as a conduit for compressed air or hydraulic oil between system components.

2. Structural Fastening: Secures brake calipers, clutch cylinders, or pneumatic valves to the chassis or transmission.

3. Leak Prevention: The precision-machined bore and sealing interface ensure a pressure-tight connection, eliminating fluid loss.

Hollow Bolt AZ9003961650 – SINOTRUK HW Series Gearbox Spare Part

When your SINOTRUK HW Series gearbox demands reliable hydraulic flow and secure fastening, the Hollow Bolt AZ9003961650 is the precision-engineered component that keeps everything running smoothly. Designed specifically for heavy-duty transmission systems, this hollow bolt serves as a critical passageway for lubricating oil within the gearbox assembly. At Mettlead, we supply this essential SINOTRUK gearbox part directly from our factory in China — which means you get competitive wholesale pricing without sacrificing quality or delivery speed.

Key Features and Benefits of Hollow Bolt AZ9003961650

This isn’t just another fastener. The Hollow Bolt AZ9003961650 plays a dual role inside the SINOTRUK HW transmission: it secures internal gearbox components while simultaneously channeling hydraulic fluid through its hollow core. Here’s what makes it a smart choice for your inventory:

• Precision-Machined Hollow Core: Ensures unobstructed oil flow to critical gearbox internals, maintaining consistent lubrication under heavy loads.
• High-Strength Material: Manufactured from hardened alloy steel to withstand the immense torque and vibration typical of heavy-truck transmissions.
• OEM-Grade Dimensional Accuracy: Matches the original SINOTRUK specifications exactly, so installation is seamless with no modifications needed.
• Corrosion-Resistant Finish: Surface-treated to resist rust and chemical degradation from transmission fluids over extended service intervals.
• Direct Replacement Design: Drops right into the HW Series gearbox without any aftermarket adapters or special tools.

In other words, stocking the AZ9003961650 hollow bolt means fewer returns, happier end-users, and a product that upholds your reputation as a dependable parts distributor.

Application and Vehicle Compatibility

The Hollow Bolt AZ9003961650 is purpose-built for the SINOTRUK HW Series manual and automated gearboxes. These transmissions are widely used across the SINOTRUK heavy truck lineup, which means consistent demand for replacement parts in aftermarket channels worldwide.

Compatible Gearbox and Vehicle Models

• SINOTRUK HW19710 Transmission
• SINOTRUK HW19712 Transmission
• SINOTRUK HW15710 Transmission
• SINOTRUK HOWO A7 Heavy-Duty Trucks
• SINOTRUK HOWO T7H Series Trucks
• SINOTRUK SITRAK C7H Series Trucks
• Other SINOTRUK models equipped with HW Series gearbox assemblies

Because SINOTRUK trucks operate extensively across Africa, the Middle East, Southeast Asia, and South America, distributors in these regions consistently need gearbox parts like the AZ9003961650 hollow bolt. Adding it to your catalog positions you to capture that recurring demand.

Looking for more SINOTRUK gearbox components? Browse our complete Gearbox Parts Collection or explore our dedicated SINOTRUK HOWO Gearbox Parts page for a full range of transmission spares.

Technical Specifications

Accuracy matters when you’re sourcing gearbox fasteners for your clients. Below you’ll find the verified specifications for the Hollow Bolt AZ9003961650:

Note: If you require specific dimensional data (thread pitch, length, bore diameter), our technical team can provide detailed drawings upon request.

OEM/ODM Capability and White-Label Packaging

As a wholesale distributor, you need flexibility — and that’s exactly what Mettlead delivers. Whether you want the Hollow Bolt AZ9003961650 shipped in neutral packaging, branded with your company logo, or bundled into gearbox repair kits, we accommodate it all.

What We Offer

• White-Label Packaging: Plain, unbranded boxes so you can add your own labels and build your brand identity in local markets.
• Custom Packaging: Your logo, part numbers, and barcodes printed directly on the packaging — ready for shelf placement or direct resale.
• Bulk Supply: Flexible MOQ to suit both large-volume importers and growing distributors testing new markets.
• Strict Quality Control: Every batch of hollow bolts undergoes dimensional inspection, material hardness testing, and surface coating verification before shipment.
• Kitting Options: We can combine the AZ9003961650 with other HW gearbox wear parts into convenient repair kits for your workshop customers.

For a full overview of available SINOTRUK parts and accessories, visit our SINOTRUK HOWO Truck Parts Brand Page.

Customer Case Study: Hollow Bolt AZ9003961650 Bulk Order for East African Distributor

Earlier this year, a truck parts distributor based in Tanzania reached out to Mettlead looking for a dependable supply of SINOTRUK HW Series Gearbox components — including the Hollow Bolt AZ9003961650. Their previous supplier delivered inconsistent quality, causing gearbox oil leaks after installation that damaged their credibility with local repair workshops.

After receiving samples from us, their technical team confirmed that our AZ9003961650 hollow bolts met exact OEM tolerances. They subsequently placed a bulk order covering 2,000 units along with complementary gearbox seals and gaskets. We shipped the entire order within 10 days using custom-branded packaging that matched their company identity.

The result? Zero leak complaints from end-users, a 40% reduction in sourcing costs compared to their former supplier, and a repeat order placed within three months. Today, they continue to purchase SINOTRUK HW gearbox parts from Mettlead on a quarterly schedule.

This is the kind of partnership we build — one where quality parts like the Hollow Bolt AZ9003961650 help your business grow steadily and sustainably.

Frequently Asked Questions About Hollow Bolt AZ9003961650

What is the function of Hollow Bolt AZ9003961650 inside the gearbox?

The hollow bolt serves a dual purpose in the SINOTRUK HW Series transmission. First, it acts as a fastener securing internal components. Second, its hollow core provides a channel for lubricating oil to pass through, ensuring critical gearbox parts receive adequate lubrication during operation. If this bolt fails or becomes clogged, you risk oil starvation and premature gear wear.

Is the AZ9003961650 hollow bolt a direct fit for all HW Series gearboxes?

Yes. The Hollow Bolt AZ9003961650 is manufactured to original SINOTRUK specifications, which means it drops directly into HW15710, HW19710, HW19712, and related HW Series transmissions without any machining or modification.

What material is this hollow bolt made from?

It’s constructed from high-strength alloy steel that has been heat-treated for hardness and fatigue resistance. The surface features a zinc-plated anti-corrosion coating to protect against degradation from transmission oil and environmental moisture over time.

How can I verify the quality before placing a large order?

We encourage all new partners to request samples first. You’ll be able to inspect the dimensions, material finish, and packaging before committing to a bulk purchase. Additionally, every production run passes through our multi-point inspection process — including thread gauge checks and surface coating thickness testing.

Can the hollow bolt AZ9003961650 be packaged under my own brand?

Absolutely. Mettlead offers white-label and fully custom packaging for the AZ9003961650 and all other SINOTRUK gearbox parts in our catalog. You provide your artwork and specifications; we handle the rest.

What happens if the hollow bolt is installed incorrectly or is a wrong specification?

Installing an incorrect hollow bolt can restrict oil flow to the gearbox internals, leading to overheating, increased friction, and eventually transmission failure. That’s precisely why using the correct OEM part number — AZ9003961650 — is critical. Our bolts match the factory spec exactly, so fitment issues are eliminated.

Ready to Stock Hollow Bolt AZ9003961650? Let’s Talk.

Whether you need 100 pieces or 10,000, Mettlead makes sourcing SINOTRUK HW Series gearbox parts straightforward and cost-effective. You’ll benefit from factory-direct pricing, rigorous quality control, fast delivery timelines, and the flexibility to customize packaging for your market.

Take the next step and contact us today to request a wholesale quotation for the Hollow Bolt AZ9003961650. Our team typically responds within 24 hours with pricing, lead times, and shipping options tailored to your region.

Mettlead — Your Factory-Direct Source for SINOTRUK, HOWO, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON Truck Parts Worldwide.