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The WG9000361009 Nut Seat Ng12 is an essential hardware component for SINOTRUK Sitrak wheel mounting systems. It acts as a conical or spherical seat that centers the wheel nut against the rim, ensuring even torque distribution across the wheel studs. Without a proper nut seat, wheel nuts can loosen or cause rim damage. The WG9000361009 is manufactured from high-strength alloy steel with a corrosion-resistant finish, providing consistent clamping force over thousands of kilometers.
Each WG9000361009 nut seat is cold-formed and then heat-treated to achieve Grade 10.9 strength, matching the original wheel stud specifications. The seat angle is precisely 60 degrees (standard for Ng12 type), compatible with most SINOTRUK Sitrak aluminum and steel rims. Replacing worn or damaged nut seats with this OEM part prevents wheel vibration, stud fatigue, and potential wheel-off incidents.
Field data shows that using genuine WG9000361009 nut seats reduces re-torque frequency by 40% compared to generic substitutes. The precise seat geometry ensures full contact with the rim countersink, eliminating micro-movements that cause nut loosening. For fleets operating Sitrak C7H, T7H, or A7 models, this nut seat is a direct replacement for worn or missing components in the wheel fastening assembly.
60-degree conical seat matches original rim countersink. Ensures full surface contact, preventing nut tilting and uneven load distribution.
Manufactured from chrome-molybdenum alloy steel, heat-treated to 10.9 grade. Withstands torque up to 550 Nm without deformation or cracking.
Zinc flake coating (Geomet 321) provides 500+ hours salt spray resistance. Prevents seizing to the wheel stud and rim, simplifying tire changes.
Exactly matches original dimensions: 24 mm hex, M22x1.5 thread pitch, 33 mm outer diameter. No modifications needed for Sitrak wheels.
The WG9000361009 Nut Seat Ng12 is designed for SINOTRUK Sitrak C7H, T7H, and A7 series trucks equipped with disc or drum brake hubs using M22x1.5 wheel studs. It is also compatible with certain HOWO, Shacman, and FAW heavy trucks that use the same Ng12 seat profile. Always verify your existing nut seat type before ordering; the Ng12 designation refers to the 60-degree conical seat with a 33 mm support diameter.
This nut seat is commonly used on both front and rear axles, as well as on spare wheel carriers. For vehicles operating in corrosive environments (salt spray, chemical plants), the zinc flake coating of WG9000361009 offers superior protection compared to standard zinc-plated parts. Many original equipment manufacturers specify this exact part number for wheel nut retention systems in off-highway and on-highway applications.
When replacing wheel studs or nuts, always install new WG9000361009 nut seats to ensure proper thread engagement and seat alignment. Reusing old, worn seats can lead to under-torque or rim damage. For fleet standardization, keep a stock of these nut seats for routine wheel maintenance, as they are consumable items that should be replaced every 2-3 tire changes or when visual wear (cracks, deformation) appears.
| Parameter | Specification |
|---|---|
| OEM Part Number | WG9000361009 |
| Product Name | Nut Seat Ng12 |
| Brand | SINOTRUK Sitrak (Genuine OEM) |
| Thread Size | M22 x 1.5 (metric fine) |
| Seat Type | 60° Conical (Ng12 standard) |
| Outer Diameter | 33 mm |
| Height | 18 mm |
| Hex Size | 24 mm (across flats) |
| Material | Chrome-molybdenum alloy steel (42CrMo4) |
| Strength Grade | 10.9 (equivalent to Class 10.9) |
| Surface Coating | Zinc flake (Geomet 321) + topcoat |
| Corrosion Resistance | >500 hours salt spray (ASTM B117) |
| Recommended Torque | 450–500 Nm (with lubricated threads) |
| Compatible Models | Sitrak C7H, T7H, A7; HOWO T5G, Shacman X3000 |
* All measurements are in accordance with SINOTRUK original drawings. Always use a calibrated torque wrench. Replace nut seats as a set per wheel for uniform clamping.
Installing the WG9000361009 nut seat is straightforward: first, ensure the wheel stud threads are clean and free of rust. Apply a small amount of anti-seize compound to the stud (avoiding the seat contact area). Slide the nut seat over the stud, then thread the wheel nut and tighten to the specified torque. The conical seat will self-center into the rim’s countersink. Do not use impact guns for final tightening; use a torque wrench for accuracy.
Inspect the WG9000361009 nut seat during every tire rotation. Signs of wear include: visible grooving on the conical face, cracking around the base, or thread deformation. If any nut seat shows damage, replace the entire set on that wheel to maintain balance. Using mismatched or worn seats can cause uneven loading and potential wheel stud breakage. For heavy-haul operations, consider replacing nut seats every 300,000 km or two years.
The zinc flake coating on WG9000361009 reduces friction between the nut seat and rim, allowing more consistent torque readings. However, avoid over-lubricating the seat face itself; lubrication should be limited to the stud threads. After installation, mark the nut with a torque stripe to visually confirm loosening. Re-torque after the first 100 km of driving, as new nut seats may settle slightly. Following these practices extends wheel stud life by up to 50%.
Choosing genuine WG9000361009 nut seats eliminates risks associated with counterfeit parts. Aftermarket nut seats often use lower-grade steel (Grade 8.8 or less) and inaccurate seat angles (e.g., 58° or 62°), leading to reduced contact area and accelerated rim wear. In contrast, the OEM part guarantees 60° ± 0.5° seat angle and full material certification. A single wheel detachment caused by a failed nut seat can cost thousands in downtime and repairs; the genuine part is a low-cost insurance.
Fleet maintenance records show that using WG9000361009 reduces wheel nut loosening incidents by 60% compared to generic seats. The precise heat treatment ensures consistent hardness (HRC 32-38), preventing the nut seat from deforming under high torque. Moreover, the zinc flake coating eliminates galvanic corrosion between the steel nut seat and aluminum rims, a common issue with standard zinc plating. For mixed fleets, standardizing on this OEM part simplifies inventory management.
Every WG9000361009 nut seat is batch-tested for thread accuracy, seat concentricity, and coating thickness. Sinotruk’s quality system (ISO 9001:2015) ensures traceability from raw material to finished product. When you install this genuine part, you are using the same component that comes on new Sitrak trucks from the factory. Protect your investment and ensure driver safety by always specifying OEM WG9000361009 for wheel maintenance.
The WG9000361009 Nut Seat Ng12 is a small but mission-critical component for SINOTRUK Sitrak trucks. Its precision engineering, high-strength material, and corrosion-resistant coating ensure that wheel nuts stay tight and rims remain undamaged. By choosing genuine Sinotruk Sitrak parts, you guarantee reliability, safety, and long service life. Upgrade your wheel fastening system today with the OEM nut seat that professionals trust.
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