Product Introduction

This precision-machined spline bush is a critical torque-transfer component designed to connect rotating parts in the drivetrain.

• Structure & Material: Made from high-strength alloy steel, it features a dense internal spline profile that mates with external splines on shafts. The surface is heat-treated for exceptional wear and impact resistance.

• Performance: The precisely cut splines ensure a backlash-free fit, allowing for efficient torque transfer while maintaining perfect alignment between components. The hardened surface resists wear from repeated engagement.

• Durability: The hardened steel construction withstands high torque loads, vibration, and friction, ensuring long service life even under harsh operating conditions.

• Compatibility: Direct OE replacement, fully matching the spline count and dimensional specifications of the vehicle’s transmission or axle system.

Core Function

1. Torque Transfer: Transmits rotational torque between splined shafts and gears with minimal power loss.

2. Precision Alignment: Ensures perfect alignment between mating components, preventing misalignment and premature wear.

3. Wear Resistance: The heat-treated internal splines resist wear and deformation, maintaining performance over time.

Spline Bush AZ2210100002 for SINOTRUK HW Series Gearbox – Factory Direct Supply

When your SINOTRUK HW series gearbox demands a reliable spline bush that delivers precise fitment and long-lasting durability, the Spline Bush AZ2210100002 stands as the go-to replacement part. Engineered specifically for heavy-duty transmission systems, this component ensures smooth torque transfer and minimizes drivetrain vibration—so your fleet stays on the road, not in the shop.

At Mettlead, we supply this genuine-spec gearbox spline bush directly from our factory in China, which means you get competitive pricing without sacrificing quality. Whether you manage a logistics fleet in Africa, a construction operation in Southeast Asia, or a trucking company in the Middle East, we deliver the right part, at the right price, on time.

Why Choose the Spline Bush AZ2210100002 for Your SINOTRUK HW Gearbox

The spline bush is a small yet critical component inside your HW series transmission. It acts as a guide sleeve between rotating shafts, reducing metal-on-metal friction and ensuring that gear engagement remains smooth under heavy loads. Here’s what makes this particular part stand out:

• Precise OEM Specification: Manufactured to match the original SINOTRUK HW gearbox dimensions, so installation is straightforward with no modifications required.
• High-Grade Material: Made from wear-resistant alloy steel that withstands continuous torque loads and high operating temperatures inside the gearbox housing.
• Extended Service Life: The hardened spline teeth resist premature wear, which translates into longer maintenance intervals and reduced downtime for your vehicles.
• Smooth Torque Transmission: Engineered spline profiles ensure even load distribution across all teeth, preventing localized stress and potential gearbox failure.
• Cost-Effective Replacement: Factory-direct pricing from Mettlead eliminates middlemen, giving procurement managers a measurable cost advantage per unit.

Application Scenarios – Where Does This Spline Bush Fit?

The Spline Bush AZ2210100002 is specifically designed for the SINOTRUK HW series gearbox, one of the most widely used heavy-duty transmissions across Chinese brand trucks. More specifically, this part is compatible with the following applications:

• Compatible Gearbox Models: HW19710, HW19712, HW15710, HW10, HW12 and other HW series variants.
• Applicable Truck Models: SINOTRUK HOWO A7, HOWO T7H, SITRAK C7H, and other heavy-duty tractor units and dump trucks equipped with HW transmissions.
• Typical Use Cases: Long-haul logistics, mining operations, construction material transport, and any scenario where the gearbox endures sustained high-torque conditions.

If you’re sourcing parts for a mixed fleet that runs on SINOTRUK drivetrains, you can browse our complete range of gearbox parts and SINOTRUK HOWO gearbox components to find everything you need in one place.

Technical Specifications – Spline Bush AZ2210100002

OEM/ODM Capability & Custom Packaging

We understand that different markets have different branding requirements. That’s why Mettlead offers flexible OEM and ODM services for the Spline Bush AZ2210100002 and our entire SINOTRUK HOWO truck parts catalog:

• White-Label Packaging: We ship in neutral boxes so you can apply your own branding at the destination, ideal for distributors who maintain their own aftermarket brand identity.
• Custom Packaging: Need your company logo, part number labels, and market-specific language on the box? We handle that in-house.
• Strict Quality Control: Every spline bush undergoes dimensional inspection, hardness testing, and surface finish verification before it leaves our facility.
• Bulk Order Flexibility: Whether you need 50 pieces or 5,000, our production line adapts to your procurement schedule.

Customer Case Study – Spline Bush AZ2210100002 for an East African Fleet Operator

In early 2024, a fleet management company based in Kenya reached out to Mettlead. They operated over 120 SINOTRUK HOWO trucks for inter-city cargo transport and were experiencing recurring gearbox noise in a batch of vehicles approaching 300,000 km.

After our technical team reviewed the symptoms, we identified worn spline bushes as the root cause. We supplied 200 units of the Spline Bush AZ2210100002 for their SINOTRUK HW series gearboxes, shipped via sea freight to Mombasa port.

The result? Their maintenance team reported that gearbox noise disappeared after replacement, and the new spline bushes delivered noticeably smoother shifting. Additionally, because they ordered directly from our factory, they saved approximately 30% compared to their previous local supplier’s pricing. Six months later, they placed a repeat order—this time adding clutch components and synchronizer rings to the shipment.

This is the kind of partnership we build at Mettlead: solve the problem, deliver quality, and earn repeat business.

Frequently Asked Questions – Spline Bush AZ2210100002

What is the function of the spline bush inside the HW series gearbox?

The spline bush AZ2210100002 serves as a guide sleeve that sits between two rotating shafts inside the gearbox. Its primary job is to maintain precise alignment during gear engagement, reduce friction between mating splines, and ensure smooth torque transmission. Without a properly functioning spline bush, you may experience gear noise, difficult shifting, or accelerated wear on adjacent components.

How do I know when the spline bush needs replacement?

Common symptoms of a worn spline bush include unusual rattling or knocking noises from the gearbox, resistance when shifting gears, and slight play or backlash in the drivetrain. If your SINOTRUK HOWO truck has exceeded 250,000–300,000 km without a gearbox overhaul, inspecting the spline bush during routine maintenance is highly recommended.

Is this spline bush identical to the original SINOTRUK OEM part?

Yes, the Spline Bush AZ2210100002 we supply is manufactured to OEM-equivalent specifications. It matches the original dimensions, material grade, and hardness requirements, ensuring direct bolt-in installation without any modification to your HW series gearbox.

Can I order this spline bush along with other HW gearbox components?

Absolutely. Many of our customers order complete gearbox overhaul kits that include spline bushes, synchronizer rings, bearings, seals, and gears. Bundling parts in a single shipment saves you time and freight costs. Browse our full SINOTRUK HOWO gearbox parts page to see what’s available.

What is the typical lead time and shipping method?

For standard stock items like the AZ2210100002 spline bush, lead time is typically 3–7 working days. We ship via international express (DHL, FedEx), air freight, or sea freight depending on your order volume and urgency. Flexible and secure payment methods are supported, and we welcome customers to visit our facility for inspection before ordering.

Ready to Source the Spline Bush AZ2210100002? Let’s Talk.

If you’re a procurement manager looking for reliable, factory-priced SINOTRUK HW series gearbox parts, you’ve found the right supplier. Mettlead offers fast quoting, flexible MOQs, and a product range that covers SINOTRUK, SITRAK, HOWO, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON truck components.

Get your quote today. Simply contact us with your part number, required quantity, and destination—our team will respond within 24 hours with pricing and delivery options.