Product Introduction

This precision-engineered stop washer is a critical component of the front axle steering system. It is installed between the steering knuckle and the king pin nut, providing a locking function to maintain the correct preload on the king pin bearings and prevent loosening due to road vibration and steering forces.

Structure & Material

• Material: High-strength spring steel, heat-treated for exceptional elasticity, wear resistance, and fatigue durability.

• Design: A thin, circular washer with a unique locking tab and notch design. The tab engages with a corresponding slot in the king pin or knuckle, while the notch locks into the nut, creating a positive anti-loosening mechanism.

Performance

• Anti-Loosening Lock: The tab-and-notch design creates a positive lock that prevents the king pin nut from loosening, even under intense road vibration and steering forces.

• Preload Maintenance: Maintains the correct preload on the king pin bearings, ensuring smooth steering and extending component life.

Compatibility

• Direct OE replacement for Sinotruk HOWO models, matching the exact dimensions, material specifications, and locking design of the original stop washer.

Core Function

1. Anti-Loosening Lock: Prevents the king pin nut from loosening due to vibration and steering forces.

2. Preload Maintenance: Maintains the correct preload on the king pin bearings for optimal steering performance.

3. Load Distribution: Distributes clamping forces evenly across the steering knuckle.

Stop Washer 712W90714-0249 for Sinotruk Sitrak – Factory Direct Supply

When it comes to keeping your Sinotruk Sitrak heavy-duty truck running safely on the road, every small component matters — especially the ones you cannot see. The Stop Washer 712W90714-0249 is a precision-engineered locking washer designed to prevent fastener loosening under extreme vibration and heavy loads. As a result, it plays a critical role in maintaining the structural integrity of your truck’s rear axle assembly and related drivetrain components.

At Mettlead, we supply this genuine-spec stop washer directly from our factory in China, ensuring you get OEM-matching quality at a competitive wholesale price. Whether you are managing a fleet maintenance program or sourcing parts for aftermarket distribution, this component delivers the reliability your operations demand.

Stop Washer 712W90714-0249 – Features and Benefits

This stop washer is far more than a simple flat disc. It is specifically engineered to serve as a locking and anti-rotation device within the Sinotruk Sitrak drivetrain system. Here is what makes it stand out:

• Positive Locking Action: The tab design bends against the fastener flat and the mating surface, physically preventing any rotational movement. Consequently, your bolts stay torqued to spec even under constant road vibration.
• High-Grade Material: Manufactured from quality carbon steel with appropriate surface treatment to resist corrosion, ensuring long service life in harsh operating environments.
• OEM Dimensional Accuracy: Produced to match the exact specifications of the original Sinotruk part number 712W90714-0249, so it fits perfectly without modification.
• Rear Axle Protection: By maintaining proper fastener tension, this washer helps protect expensive rear axle components from premature wear caused by loosening.
• Cost-Effective Maintenance: Replacing stop washers during routine service is a low-cost preventive measure that avoids costly breakdowns and unplanned downtime.

In other words, this small component acts as an insurance policy for your truck’s most critical assemblies. Moreover, sourcing it from Mettlead means you benefit from factory-direct pricing without sacrificing quality.

Technical Specifications – Stop Washer 712W90714-0249

For a complete overview of all available Sitrak components, feel free to browse our Sitrak Heavy-Duty Parts catalog. Additionally, you can explore more rear axle components in our dedicated Rear Axle Parts category.

Application Scenario – Where Does This Stop Washer Fit?

The Stop Washer 712W90714-0249 is specifically designed for the Sinotruk Sitrak heavy-duty truck platform. Its primary role is to provide positive locking on critical fasteners within the rear axle and drivetrain area. Here is a closer look at its application context:

• Compatible Truck Models: Sinotruk Sitrak C7H, G7, and related heavy-duty series equipped with the matching rear axle configuration.
• Installation Position: Mounted beneath or alongside critical bolts and nuts in the rear axle housing, differential carrier, or related mounting points.
• Core Function: Acts as a stop device — once the tab is bent into position, it physically prevents the nut or bolt from rotating loose, even under sustained vibration from heavy payloads and rough road surfaces.
• Maintenance Timing: Should be inspected and replaced during scheduled rear axle service intervals, or whenever the associated fastener is removed during repair.

Because this washer is a single-use locking device by design, it should always be replaced with a new unit after removal. Reusing a bent stop washer compromises its locking ability and puts your axle assembly at risk.

Looking for a full breakdown of Sinotruk Sitrak parts by system and category? Visit our Sinotruk Sitrak Truck Parts Full Category Guide for easy navigation.

OEM/ODM Capability – Custom Packaging and White-Label Options

Mettlead understands that different markets have different branding requirements. That is why we offer flexible OEM and ODM services for all our truck parts, including the Stop Washer 712W90714-0249:

• White-Label Packaging: We can supply this stop washer in neutral packaging or under your own brand label, making it easy to integrate into your existing product line.
• Custom Packaging Design: Need specific box sizes, multilingual labels, or barcode formats? Our team handles it all.
• Strict Quality Control: Every batch undergoes dimensional inspection and material verification before shipment, so you can confidently put your brand name on our products.
• Bulk Order Flexibility: Whether you need a small trial order or container-load quantities, we accommodate your purchasing schedule.
• Factory Visits Welcome: We encourage prospective partners to visit our facility in China to see our production and QC processes firsthand.

In short, when you partner with Mettlead, you gain a reliable supply chain extension — not just a parts vendor.

Frequently Asked Questions – Stop Washer 712W90714-0249

What exactly does a stop washer do on a heavy-duty truck?

A stop washer — also called a tab washer or locking washer — physically prevents a bolt or nut from rotating loose. It features one or more tabs that bend against the fastener and the mating surface, creating a mechanical lock. This is especially important in high-vibration areas like the rear axle, where standard friction alone cannot keep fasteners secure over time.

Can I reuse the Stop Washer 712W90714-0249 after removing it?

No, you should not reuse this stop washer. Once the locking tabs have been bent, the metal fatigues at the fold point. Reusing it means the tab may crack or fail to hold, which defeats the entire purpose of the washer. Always install a fresh stop washer whenever you disassemble and reassemble the associated joint.

Is this stop washer compatible with other Sinotruk models besides Sitrak?

The part number 712W90714-0249 is specifically cataloged for the Sinotruk Sitrak platform. However, some Sinotruk HOWO models may share similar rear axle architecture. We recommend confirming the part number against your truck’s parts manual or contacting our team to verify cross-compatibility before ordering.

What happens if I do not replace a worn stop washer during service?

If a stop washer is missing or damaged, the associated fastener has no mechanical locking mechanism. Over time, road vibration will gradually loosen the bolt or nut, potentially leading to component misalignment, abnormal wear, oil leaks, or in severe cases, rear axle failure. Replacing it is a simple, inexpensive step that prevents expensive repairs.

How should I install this stop washer correctly?

First, place the washer over the bolt or stud with the tab aligned to the mating surface edge. Then, torque the nut or bolt to the manufacturer’s specified value. Finally, bend the appropriate tab firmly against one flat of the nut and, if applicable, bend the outer tab against the housing or bracket. Use a proper bending tool to ensure a clean, tight fold.

Ready to Source Your Stop Washer 712W90714-0249?

Getting the right parts at the right price should never be complicated. At Mettlead, we make it simple: factory-direct pricing, fast delivery, and a complete catalog of Sinotruk Sitrak components — all backed by strict quality control.

Whether you need a single part number or a full container of mixed truck parts, our team is ready to support your procurement needs. We offer flexible payment methods, professional export packaging, and responsive communication throughout the order process.

Take the next step today: Contact us now to request a quote, confirm availability, or discuss your custom packaging requirements. Let Mettlead be your trusted partner for Sinotruk Sitrak parts supply.