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 WG4007410065 for Sinotruk Sitrak – Factory Direct Supply

When it comes to keeping your Sinotruk Sitrak front axle components locked firmly in place, the Stop Washer WG4007410065 plays a quiet but critical role. This precision-engineered locking washer prevents unwanted rotation and positional drift of fastened parts, ensuring your heavy-duty truck stays safe and reliable on every haul. At Mettlead, we supply this genuine-spec stop washer directly from our factory in China — giving you OEM-grade quality at a price that makes your procurement budget work harder.

Whether you manage a fleet of Sitrak C7H tractor units or run an aftermarket parts distribution business, this page gives you everything you need to know before placing your order. Let’s walk through the details.

Key Features and Benefits of Stop Washer WG4007410065

A stop washer might seem like a small component, but in a heavy-duty truck environment, it shoulders enormous responsibility. Here’s why the WG4007410065 stands out:

• Positive Locking Action: The washer’s tab design bends against the fastener flat, physically preventing the nut or bolt from rotating loose — even under extreme vibration and heavy loads.
• Precision Dimensional Accuracy: Manufactured to match OEM specifications for Sinotruk Sitrak trucks, so it fits perfectly without modification or shimming.
• High-Grade Material: Made from quality carbon steel with appropriate surface treatment to resist corrosion and maintain clamping integrity over time.
• Extended Service Life: Because it eliminates micro-movement between mating surfaces, surrounding components also experience less wear — saving you money on downstream repairs.
• Easy Installation: Drops right into the assembly without special tools, which means less workshop downtime during maintenance.

In short, this stop washer does exactly what its name promises: it stops things from moving when they shouldn’t. And in a truck that weighs dozens of tonnes, that matters more than most people realize.

Application Scenario: Where Does This Stop Washer Fit?

The Stop Washer WG4007410065 is specifically designed for the Sinotruk Sitrak heavy-duty truck platform. Its primary function is to serve as a locking and anti-rotation device within the front axle assembly. More specifically:

• Compatible Truck Series: Sinotruk Sitrak (汕德卡) — including C7H, C5H, and G7 series models equipped with the standard front axle configuration.
• Function: Acts as a stop washer (止动垫圈) that provides limit positioning and anti-loosening protection for critical fasteners.
• Mounting Location: Installed on the front axle system to fix component positions and prevent axial or rotational displacement under dynamic road loads.

Every time your Sitrak truck hits a pothole, takes a sharp turn, or brakes hard under full load, the front axle absorbs tremendous forces. Without a properly functioning stop washer, fasteners can gradually work loose — leading to steering play, abnormal tire wear, or worse. This small part is your first line of defense against those cascading failures.

Technical Specifications

Need to cross-reference this part number with your existing inventory system? Our team can help you verify fitment before you order. Just contact us with your truck model and VIN.

OEM/ODM Capability and Custom Packaging

At Mettlead, we understand that different markets have different needs. That’s why we offer flexible options beyond standard supply:

• White-Label Packaging: Want to sell under your own brand? We provide neutral or custom-branded packaging so you can build your local brand identity without manufacturing overhead.
• Custom Packaging Design: From individual poly bags with printed labels to full-color retail boxes, we adapt packaging to your market requirements.
• Strict Quality Control: Every batch of stop washers undergoes dimensional inspection and material verification before shipment. We don’t cut corners on QC — because a failed washer can mean a failed axle.
• Bulk and Mixed Orders: Ordering just stop washers? Or bundling them with other Sitrak heavy-duty truck parts? Either way, we handle it efficiently.

Our factory-direct model eliminates middlemen, which translates to better pricing and faster lead times for you. Additionally, if you’re sourcing across multiple Sinotruk platforms, you can explore our Sinotruk Sitrak truck parts full category guide to find everything in one place.

Frequently Asked Questions About Stop Washer WG4007410065

What exactly does a stop washer do in the front axle?

A stop washer like the WG4007410065 physically prevents a fastener from rotating. Unlike spring washers that rely on friction alone, a stop washer uses a bent tab that locks against a flat on the nut or bolt. This makes it virtually impossible for the fastener to loosen under vibration — which is essential in a high-stress area like the front axle of a heavy truck.

Is this stop washer reusable after removal?

Generally speaking, stop washers are considered single-use components. Once the locking tab has been bent and then straightened for removal, the metal fatigues at the bend point. For safety-critical applications on your Sitrak truck, we strongly recommend installing a new WG4007410065 stop washer every time you disassemble the related joint.

How do I confirm this part fits my specific Sitrak model?

The WG4007410065 is cataloged for the Sinotruk Sitrak platform’s front axle system. However, because Sitrak trucks come in multiple configurations, we recommend verifying against your truck’s VIN or original parts manual. If you’re unsure, send us your vehicle details through our contact page and we’ll confirm compatibility within 24 hours.

What material is this stop washer made from?

It’s manufactured from carbon steel with a zinc-plated or phosphated surface finish. This combination provides the mechanical strength needed to hold the locking tab in position while also resisting corrosion from road salt, moisture, and chemical exposure.

Can I order this part in small quantities for testing?

Absolutely. We offer flexible minimum order quantities, especially for new customers who want to evaluate quality before committing to larger volumes. Reach out to our sales team to discuss sample orders or trial quantities.

How should I store stop washers before installation?

Keep them in a dry, ventilated environment away from corrosive chemicals. Although the surface treatment provides good corrosion resistance, prolonged exposure to moisture can degrade the coating over time. Store in their original packaging until ready for use.

Ready to Source Your Stop Washer WG4007410065?

You’ve done your research — now it’s time to take the next step. Whether you need 50 pieces or 50,000, Mettlead delivers factory-direct pricing, reliable quality, and fast shipping on the Stop Washer WG4007410065 for Sinotruk Sitrak trucks.

Here’s what happens when you reach out:

1. You send us your part number and quantity requirements.
2. We confirm availability, pricing, and estimated delivery time — usually within the same business day.
3. You receive a formal quotation with flexible, secure payment options.
4. We ship your order with full tracking and quality documentation.

Contact Mettlead now to request your quotation. Let’s get your trucks back on the road with the right parts, at the right price, delivered on time.