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The FG21032073744035/1 Rear Wheel Hub Bearing Lock Nut is a precision-engineered wheel-end fastening component designed specifically for Sinotruk Sitrak parts systems, including the popular SITRAK C7H, C5H, and HOWO T7H heavy‑duty truck models. This high‑strength lock nut ensures reliable clamping of the wheel hub bearing assembly, maintaining correct preload and preventing bearing loosening under the most severe operating conditions.
Engineered to meet the rigorous demands of heavy‑duty commercial vehicles, the FG21032073744035/1 bearing lock nut is manufactured from high‑grade alloy steel with a precision‑machined thread profile, offering exceptional strength, wear resistance, and long‑term reliability over millions of kilometers.
Bearing Lock Nut
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| Parameter | Specification / Value |
|---|---|
| OEM Number | FG21032073744035/1 |
| Product Name | Rear Wheel Hub Bearing Lock Nut |
| Brand | SINOTRUK Sitrak |
| Material | High‑strength alloy steel (42CrMo / equivalent) |
| Thread Size | M110 × 2.0 (per OEM specification) |
| Surface Treatment | Zinc‑phosphate coating + oil (corrosion‑resistant) |
| Torque Specification | 650–750 N·m (with bearing preload adjustment) |
| Weight | Approx. 1.2 kg (2.6 lbs) |
| Application | Rear wheel hub bearing retaining |
| Compatible Models | SITRAK C7H, C5H, HOWO T7H, T5G, A7, and other SINOTRUK trucks |
| Service Life | 200,000+ km under normal operating conditions |
| Quality Standard | OEM‑grade, meets SINOTRUK factory specifications |
The FG21032073744035/1 Rear Wheel Hub Bearing Lock Nut is a critical fastening component that secures the wheel hub bearing assembly to the axle spindle in SINOTRUK Sitrak heavy‑duty trucks. This lock nut maintains the correct bearing preload, ensuring smooth wheel rotation, minimal vibration, and extended bearing life. A properly torqued lock nut is essential for safe vehicle operation, as it prevents bearing play, overheating, and premature failure that could lead to wheel separation or axle damage.
Manufactured from high‑strength alloy steel, the FG21032073744035/1 lock nut features a precision‑rolled thread profile that provides a secure, vibration‑resistant fit. The zinc‑phosphate coating offers excellent corrosion resistance, ensuring that the nut remains easy to remove and re‑torque during maintenance. The nut’s integrated locking feature prevents loosening under dynamic loads, guaranteeing that the bearing preload remains consistent over hundreds of thousands of kilometers. This genuine OEM component is a direct replacement for the original factory lock nut, ensuring a perfect fit and restoring the wheel‑end assembly’s full reliability.
A correctly installed bearing lock nut is vital for wheel‑end safety and longevity. The FG21032073744035/1 lock nut eliminates the risk of bearing loosening, excessive play, and premature wear, ensuring that your SITRAK or HOWO truck delivers safe, stable, and trouble‑free operation over millions of kilometers.
The FG21032073744035/1 lock nut is manufactured from premium alloy steel, providing exceptional tensile strength and resistance to deformation under high torque and heavy loads.
The zinc‑phosphate coating protects the nut from rust and corrosion, ensuring long‑term durability and ease of service in harsh road and weather conditions.
The nut’s integrated locking feature prevents loosening due to vibration, maintaining consistent bearing preload and eliminating the risk of wheel‑end play.
Designed to match the exact thread dimensions and torque specifications of the original factory lock nut, the FG21032073744035/1 allows for a straightforward, bolt‑on installation with no modifications required.
Maintains Bearing Preload: The FG21032073744035/1 lock nut ensures accurate bearing preload, preventing excessive play and reducing bearing wear for extended wheel‑end life.
Prevents Wheel Loosening: The lock nut’s vibration‑resistant design keeps the wheel hub securely attached, reducing the risk of wheel separation and improving vehicle safety.
Extends Bearing Life: By maintaining correct preload and preventing play, the lock nut significantly extends the service life of the wheel hub bearings, reducing maintenance costs.
Reduces Downtime: As a direct OEM replacement, the FG21032073744035/1 lock nut simplifies wheel‑end servicing, minimising vehicle off‑road time and keeping your fleet operational.
OEM Quality Assurance: The FG21032073744035/1 lock nut meets SINOTRUK’s original equipment specifications, guaranteeing a perfect fit and reliable performance that matches the original factory part.
Wide Compatibility: This lock nut is compatible with a broad range of SINOTRUK trucks, including SITRAK C7H, C5H, HOWO T7H, T5G, and A7, simplifying inventory management for fleet operators.
Compatible Models:
The FG21032073744035/1 lock nut is a direct cross‑reference for multiple OEM part numbers, ensuring broad applicability across the SINOTRUK truck range. Always verify compatibility using your vehicle’s VIN or existing lock nut part number.
Installation Tips & Best Practices:
The FG21032073744035/1 bearing lock nut is produced using advanced forging and precision machining techniques to ensure consistent quality and dimensional accuracy. The alloy steel is sourced from certified suppliers and undergoes rigorous inspection for material properties and surface quality. The nut is formed using precision forging processes that align the grain structure for maximum strength and fatigue resistance.
After forging, the lock nut is precision‑machined to achieve the exact thread form and dimensions required for a perfect fit. The zinc‑phosphate coating is applied in a controlled process to ensure uniform thickness and excellent corrosion protection. The nut is also subjected to hardness testing and torque retention tests to verify its mechanical properties and locking performance.
Each FG21032073744035/1 lock nut undergoes stringent quality control inspections, including dimensional verification, thread gauging, and visual inspection, to ensure it meets the demanding requirements of SINOTRUK’s original equipment specifications and provides reliable service for hundreds of thousands of kilometers.
The FG21032073744035/1 Rear Wheel Hub Bearing Lock Nut from SINOTRUK Sitrak is the definitive choice for fleet operators and owner‑drivers who demand uncompromising wheel‑end reliability, safety, and durability. As a genuine OEM‑grade component, it guarantees a perfect fit, consistent bearing preload, and peace of mind—backed by SINOTRUK’s engineering excellence and decades of experience in heavy commercial vehicle manufacturing.
Whether you are replacing a worn lock nut on a high‑mileage fleet truck or performing preventive maintenance on a SITRAK C7H, the FG21032073744035/1 nut delivers the performance and durability you need to keep your wheel‑end assemblies secure and trouble‑free. Its proven design, premium materials, and exacting tolerances make it the smart choice for any wheel‑end repair or preventive maintenance program.
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