Engineered for extreme durability, the 810W90685-0303A Lock Nut (MCY13) is the definitive fastening solution for Howo and Sitrak heavy-duty truck axles. As a core component in the Howo/Sitrak truck parts ecosystem, this precision-machined lock nut ensures zero axial play, eliminates loosening under high torque, and extends wheel-end service life by up to 40%. Whether you operate a Howo A7, T7H, or Sitrak C7H, the 810W90685-0303A delivers race-proven reliability for on-highway and off-road applications.
The 810W90685-0303A Lock Nut (MCY13) is manufactured from high-grade alloy steel with a specialized anti-corrosion coating, meeting Sinotruk’s strict OEM tolerances. Its unique self-locking thread design (MCY13 profile) resists back-off even under severe vibration, making it the preferred replacement for Howo, Sitrak, and Sinotruk axle assemblies. With a tensile strength exceeding 1,200 MPa, this nut secures the wheel hub, differential, or axle shaft with unwavering clamping force.
| Parameter | Value / Detail |
|---|---|
| OEM Number | 810W90685-0303A |
| Product Name | Lock Nut (MCY13) |
| Brand / Fitment | Howo · Sitrak · Sinotruk |
| Thread Pitch | M42 x 1.5 mm |
| Hex Size | 65 mm (AF) |
| Height | 28.5 mm |
| Surface | Zinc-nickel, 720h salt spray |
| Hardness | HRC 32–38 |
| Locking Type | Deformed thread (prevailing torque) |
MCY13 thread lock maintains torque even under 12G vibration.
Re-engineered surface reduces corrosion and thread galling.
Direct replacement for all Howo/Sitrak hub & differential nuts.
Strictly follows Sinotruk drawing 810W90685-0303A, 100% traceable.
The 810W90685-0303A Lock Nut (MCY13) is designed for Howo A7, Howo T7H, Sitrak C7H, and Sinotruk HD series axles. It fits both front drive and rear bogie positions where MCY13 thread specification is used. Fleet managers appreciate its consistent clamping force that prevents wheel bearing preload loss, reducing downtime and hub maintenance intervals.
Heat-treated 42CrMo4 steel provides exceptional ductility and fatigue resistance. The proprietary zinc-nickel plating with trivalent passivation exceeds 720 hours of neutral salt spray resistance, protecting the 810W90685-0303A against road salt, mud, and moisture. This makes the Lock Nut (MCY13) ideal for arctic, desert, and coastal operations.
Each batch is 100% inspected for thread concentricity, hardness, and prevailing torque (minimum 25 Nm first movement). The result is a fastening component that delivers consistent performance across millions of miles.
ZnNi coating surpasses standard zinc-plated nuts by 3x corrosion resistance.
Controlled friction coefficient ensures accurate preload every time.
Same-day dispatch for bulk and emergency orders (global logistics).
Laser-engraved 810W90685-0303A and batch code for full quality audit.
For heavy-duty trucks, replacing the lock nut during every hub-overhaul (approx. 300,000 km) is recommended. However, the Lock Nut (MCY13) can be re-torqued once if preload remains within spec. Inspect threads for wear; if damaged, install a new 810W90685-0303A to maintain axle integrity. Always pair with a new cotter pin or locking tab (not included).
All lock nuts are manufactured in ISO 9001:2015 and IATF 16949 certified facilities. The Lock Nut (MCY13) meets Sinotruk’s material and dimensional standards, as verified by third-party laboratory testing. We stand behind every component with a 12-month warranty against manufacturing defects.
For fleet operators, using genuine-spec Lock Nut reduces unscheduled repairs and keeps your Howo or Sitrak trucks on the road with maximum uptime. Trust the original design – trust the MCY13 lock nut.
810W90685-0303A · Lock Nut (MCY13) · Howo & Sitrak approved · OEM durability without compromise.
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