Product Introduction

This precision-engineered slotted locking nut is a critical fastener for heavy-duty truck drivetrains and wheel-ends. It delivers a high clamping force and, when paired with a cotter pin, ensures components like the differential drive pinion or wheel hub bearing remain securely locked and under precise preload, even under extreme operating conditions.

Structure & Material

• Material: High-tensile alloy steel (10.9 grade), heat-treated for superior tensile strength and fatigue resistance. The surface features a black oxide coating for corrosion protection.

• Design: A heavy-duty slotted nut with precision internal threads and external locking slots. The slots align with a drilled hole in the shaft, allowing a cotter pin to be inserted to prevent loosening from vibration.

Performance

• High Clamping Force: The 10.9-grade steel provides a high preload to maintain precise bearing preload or component alignment.

• Vibration Resistance: The slotted design, when used with a cotter pin, creates a permanent lock that prevents loosening, even under intense road vibration.

Durability

• High-tensile alloy steel resists stretching, shearing, and fatigue under continuous heavy loads and shock impacts.

• The black oxide coating protects against environmental corrosion, extending the nut’s service life in harsh operating conditions.

Core Function

1. Component Securement: Provides a high-preload clamp for critical drivetrain and wheel-end components.

2. Anti-Loosening Lock: The slotted design works with a cotter pin to prevent vibration-induced loosening.

3. Preload Maintenance: Maintains precise bearing preload to ensure optimal performance and longevity of components like the differential drive pinion.

Locking Nut 810W90685-0303 – Genuine Sinotruk Sitrak Rear Axle Fastener

When your Sitrak heavy-duty truck is hauling full loads across demanding terrain, every single fastener matters. The Locking Nut 810W90685-0303 is engineered specifically for Sinotruk Sitrak vehicles to keep critical rear axle components firmly secured — eliminating the risk of loosening under extreme vibration and torque. Sourced directly from our factory, this OEM-grade locking nut delivers the precise fit and lasting reliability that fleet managers and procurement professionals demand.

At Mettlead, we specialize in supplying genuine and aftermarket parts for China’s leading commercial vehicle brands. As a factory-direct supplier, we offer competitive pricing, rapid delivery, and the complete confidence that comes with strict quality control. Whether you’re maintaining a single truck or managing a large fleet, this locking nut ensures your Sitrak stays on the road — safely and efficiently.

Key Features and Benefits of Locking Nut 810W90685-0303

This isn’t just any nut — it’s a precision-machined locking fastener built to meet the rigorous standards of Sinotruk’s Sitrak platform. Here’s why it deserves a place in your parts inventory:

• Anti-Loosening Design: The integrated locking mechanism resists rotational loosening caused by heavy vibration, ensuring joints remain tight over thousands of kilometers.
• OEM-Matched Specifications: Manufactured to the exact dimensions and material grade specified by Sinotruk, guaranteeing a perfect fit without modifications.
• High-Strength Material: Crafted from hardened alloy steel with surface treatment for superior corrosion resistance and fatigue life.
• Rear Axle Reliability: Specifically designed to reinforce rear axle assemblies — one of the most stress-intensive zones on any heavy-duty truck.
• Cost-Effective Maintenance: Factory-direct pricing means you get genuine quality without the inflated cost of middlemen.

Technical Specifications – Locking Nut 810W90685-0303 Sinotruk Sitrak

Application Scenario – Where Does This Locking Nut Fit?

The Locking Nut 810W90685-0303 is designed for installation on the rear axle assembly of Sinotruk Sitrak heavy-duty trucks. In real-world operation, the rear axle endures continuous dynamic loads — from acceleration forces and braking torque to road-induced vibrations. Over time, standard fasteners can gradually work loose, leading to play in critical joints, abnormal noise, or even component failure.

This locking nut solves that problem. Its self-locking feature keeps rear axle components firmly seated, reinforcing structural integrity and preventing dangerous loosening. Consequently, it’s an essential maintenance and replacement part for:

• Sitrak C7H long-haul tractors
• Sitrak C5H regional distribution trucks
• Other Sinotruk Sitrak models equipped with the corresponding rear axle configuration

If you’re looking for more Sitrak rear axle components, feel free to browse our Rear Axle Parts category or explore the full Sitrak Heavy-Duty Parts catalog.

OEM/ODM Capability – Flexible Supply for Your Business

Mettlead doesn’t just ship parts — we partner with distributors, workshops, and fleet operators around the globe. Here’s what sets our supply model apart:

• White-Label Packaging: Need your own brand on the box? We offer neutral or custom-branded packaging to match your business identity.
• Custom Packaging Solutions: From bulk pallet shipments to individually boxed units, we adapt packaging to your logistics requirements.
• Strict Quality Control: Every locking nut undergoes dimensional inspection, material verification, and surface treatment checks before leaving our warehouse.
• Broad Part Coverage: Beyond Sitrak, we supply parts for HOWO, Shacman, FAW, Weichai, Dongfeng, and Foton — all from one source.
• Factory Visits Welcome: Transparency builds trust. You’re always welcome to visit our facilities and inspect quality firsthand.

For a comprehensive overview of every Sinotruk Sitrak part we carry, visit our Sinotruk Sitrak Truck Parts Full Category Guide.

Frequently Asked Questions – Locking Nut 810W90685-0303

What is the primary function of Locking Nut 810W90685-0303?

This locking nut is specifically designed to fasten and secure rear axle components on Sinotruk Sitrak trucks. Its self-locking mechanism prevents the nut from backing off under continuous vibration and heavy loads, which ultimately protects the axle assembly from premature wear or dangerous loosening.

Is this locking nut reusable after removal?

While the nut can physically be re-installed, it’s generally recommended to replace locking nuts after removal. The locking feature may lose effectiveness once the prevailing torque element has been deformed during initial installation. For safety-critical rear axle applications, using a new nut ensures optimal clamping force.

How do I verify that 810W90685-0303 fits my specific Sitrak model?

The most reliable method is to cross-reference the OEM part number 810W90685-0303 with your vehicle’s parts catalog or VIN-based lookup. If you’re unsure, simply send us your truck model and VIN — our team will confirm compatibility before shipment.

What torque specification should I apply during installation?

Always follow the torque value specified in the Sinotruk Sitrak workshop manual for the particular rear axle joint you’re servicing. Over-torquing can damage the locking feature, while under-torquing may compromise clamping force. If you need torque reference guidance, our technical team is happy to assist.

Can I order this locking nut in bulk quantities?

Absolutely. Mettlead is set up for both small and large-volume orders. Whether you need ten pieces for a maintenance job or ten thousand for wholesale distribution, we provide flexible MOQ options and volume-based pricing. Just reach out for a custom quote.

Ready to Secure Your Supply? Get a Quote Today

Don’t let a small fastener create a big problem. The Locking Nut 810W90685-0303 is in stock and ready to ship — with factory-direct pricing, fast lead times, and the quality assurance your fleet deserves.

Whether you need a single part number or a full container of Sitrak components, our team responds quickly and works on your timeline. Flexible payment methods, reliable logistics partners, and dedicated after-sales support are all part of the package.

Take the next step: Contact us now to request pricing, confirm fitment, or discuss your bulk order needs. Let’s keep your trucks moving.