OEM AZ9231320135
Experience the superior strength‑to‑weight performance of the AZ9231320135 Hollow Shaft, a precision‑engineered drivetrain component designed for SINOTRUK Howo heavy‑duty trucks. This genuine part is a critical element of our premium Sinotruk howo parts portfolio, manufactured from high‑strength alloy steel to withstand extreme torque while reducing rotational mass. The AZ9231320135 shaft ensures efficient power transfer through planetary hubs and transmissions, delivering smooth operation and long‑term durability.
| Parameter | Specification |
|---|---|
| OEM Number | AZ9231320135 |
| Product Name | Hollow Shaft |
| Brand / Series | SINOTRUK Howo Genuine |
| Material | 20MnCr5 case‑hardened alloy steel |
| Outer Diameter | 85 mm |
| Inner Diameter | 45 mm |
| Length | 380 mm |
| Weight | 8.5 kg |
| Heat Treatment | Carburized & hardened (58‑62 HRC) |
| Compatible Models | Howo A7, T7H, ZZ4257, ZZ3257 (planetary hubs) |
The hollow construction reduces rotating mass by up to 35% compared to solid shafts, improving fuel efficiency and reducing drivetrain inertia.
Carburized to a depth of 0.8‑1.2 mm, the shaft achieves extreme surface hardness while maintaining a tough core that absorbs torsional shock loads.
Engineered to handle over 2,500 Nm of torque, this shaft reliably transfers power in the most demanding heavy‑duty applications.
Every shaft undergoes magnetic particle inspection and CMM verification to guarantee zero defects and perfect spline alignment.
This hollow shaft is a direct replacement for the following SINOTRUK Howo transmissions and planetary hubs:
The AZ9231320135 hollow shaft is manufactured from high‑quality 20MnCr5 alloy steel, which is first forged to create a dense, grain‑oriented structure that maximizes strength. The forging process eliminates internal voids and aligns the metal grain with the load paths, providing exceptional resistance to fatigue. After forging, the shaft is rough machined and then heat‑treated in a controlled atmosphere carburizing furnace, producing a hard wear‑resistant case (58‑62 HRC) while maintaining a tough, ductile core. The hollow bore is precision‑drilled and honed to ensure concentricity and balance.
In a planetary hub reduction system, the hollow shaft transfers torque from the differential to the sun gear. Its lightweight design reduces unsprung mass and rotational inertia, which improves vehicle responsiveness and fuel economy. The AZ9231320135 is designed with finite element analysis (FEA) to optimize the wall thickness, ensuring maximum torsional strength with minimal weight. This precision engineering guarantees that the shaft can withstand the extreme torque spikes encountered in off‑road and mining applications.
After heat treatment, the shaft undergoes finish machining on multi‑axis CNC centers. The splines are precision broached or rolled to ensure perfect engagement with mating gears. The bearing journals are ground to H6 tolerance, and the hollow bore is honed to a mirror finish to minimize stress concentrations. Every critical dimension is verified using a coordinate measuring machine (CMM), with data archived for full traceability.
Quality control for the AZ9231320135 includes 100% magnetic particle inspection of all surfaces to detect any grinding cracks or forging laps. In addition, sample shafts from each production batch are assembled into a complete planetary hub and run on a dynamometer at 120% of rated torque for 100 hours. No measurable wear or dimensional change is permitted.
Environmental sustainability is a key consideration in the production of this shaft. The steel used is sourced from electric arc furnaces with over 90% recycled content. All machining chips are collected and returned to the steel mill for recycling. The carburizing process uses energy‑efficient furnaces with low NOx emissions, and any waste oil is properly disposed of in accordance with ISO 14001 standards.
For fleet maintenance, the AZ9231320135 shaft is available individually or as part of a complete planetary overhaul kit that includes planet gears, pins, bearings, and thrust washers. Each shaft is packaged in a heavy‑duty wooden crate with custom foam supports to protect the precision‑ground surfaces during shipping. A certificate of conformance with actual measured dimensions is included.
Field performance data collected from over 300 Howo trucks operating in Australian iron ore mines shows that the AZ9231320135 hollow shaft has a mean time between failures exceeding 800,000 kilometers when properly maintained. This exceptional reliability is the result of superior metallurgy and precise manufacturing. Many fleet managers have standardized on this genuine part for all their axle overhauls, reducing parts inventory complexity and ensuring consistent quality.
When ordering, please verify your vehicle’s axle model and VIN to ensure correct fitment. The AZ9231320135 hollow shaft is specifically designed for Howo planetary axles with 16‑ton capacity. For other models, please consult our cross‑reference guide. Our technical team is available to answer any questions regarding compatibility, but please note that we do not provide direct contact information on this page as per our policy; instead, you may refer to the documentation included with the part or contact your local SINOTRUK dealer.
In summary, the AZ9231320135 hollow shaft represents the highest standard of quality and engineering for SINOTRUK Howo heavy‑duty axles. Its forged construction, precision machined features, and rigorous testing ensure reliable power transfer and extended axle life. By choosing this genuine component, you protect your investment and keep your fleet on the road. Trust the AZ9231320135 – the heart of your planetary hub.
During axle service, inspect the shaft for cracks, signs of fretting on splines, or bearing surface wear. Check runout with a dial indicator if suspect.
Use only the recommended SAE 80W‑90 GL‑5 gear oil. Change oil at intervals specified in the maintenance schedule to prevent contamination.
Only the authentic AZ9231320135 hollow shaft carries SINOTRUK’s material certification. Imitations often use low‑grade steel that fractures under load, leading to catastrophic axle failure. The genuine part is traceable to an ISO 9001 forge, with 100% inspection. When you install this shaft, you preserve the resale value of your Howo and avoid roadside failures. Fleet operators report that using the OEM component cuts unscheduled axle repairs by 65%.
Preparation: Clean the hub and carrier mating surfaces. Install new bearings and thrust washers. Lightly oil the shaft splines and bearing journals.
Assembly: Carefully insert the shaft into the hub, ensuring the splines align. Torque the retaining nut to 450‑500 Nm and stake it according to the service manual.
After installation, rotate the wheel hub to check for smooth operation. Fill with gear oil and run the vehicle lightly before full load. Always replace the AZ9231320135 if any damage is observed during disassembly.
Precision‑ground bearing surfaces and balanced design reduce driveline vibration and planetary gear whine.
The case‑hardened alloy retains its strength even under sustained high‑load operation, preventing spline wear and bore distortion.
The steel contains over 90% recycled content. Forging flash and machining scrap are recycled, minimizing environmental footprint.
At end of life, the shaft is 100% recyclable, supporting circular economy principles and reducing landfill waste.
Every AZ9231320135 hollow shaft leaves the factory with a laser‑etched part number for full traceability. When you order from our official warehouse, you receive the latest design with optimized wall thickness – a detail many suppliers ignore. Pair the shaft with genuine SINOTRUK Howo bearings and seals for a 100% match.
To verify the authenticity of your AZ9231320135, check the forged mark on the shaft flange. Our global network ensures fast delivery to any heavy‑duty workshop. Trust this shaft to keep your Howo axles operating at peak efficiency – it’s the component that makes the difference between average and exceptional performance.
AZ9231320135 – 100% Genuine SINOTRUK Howo Hollow Shaft • Built for the long haul • No forms, just quality parts.
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