OEM AZ7121340130
Secure your SINOTRUK Howo wheels with the unmatched strength of the AZ7121340130 Wheel Bolt, a precision‑engineered fastener designed to withstand the extreme forces of heavy‑duty trucking. This genuine part is a critical element of our premium Sinotruk howo parts lineup, manufactured from high‑tensile alloy steel to deliver reliable clamping force and long‑term durability. The AZ7121340130 bolt ensures your wheels stay safely mounted, mile after mile.
| Parameter | Specification |
|---|---|
| OEM Number | AZ7121340130 |
| Product Name | Wheel Bolt |
| Brand / Series | SINOTRUK Howo Genuine |
| Material | 40Cr alloy steel / Grade 10.9 |
| Surface Finish | Zinc‑plated / yellow passivated |
| Thread Size | M22 x 1.5 |
| Length | 82 mm |
| Head Size / Type | 32 mm hex / spherical seat |
| Weight per bolt | 0.42 kg |
| Compatible Models | Howo A7, T7H, ZZ4257, ZZ3257 (front & rear wheels) |
Manufactured from 40Cr alloy steel and heat‑treated to Grade 10.9, the AZ7121340130 provides a tensile strength of over 1,000 MPa, ensuring the wheel stays clamped under all loads.
Threads are formed by rolling after heat treatment, creating a smooth, accurate profile that reduces friction and provides consistent clamping force.
A robust zinc plating with yellow passivation provides exceptional resistance to road salt, moisture, and corrosion, ensuring the bolt remains serviceable for years.
Every bolt is eddy‑current tested to detect any surface defects, guaranteeing zero hidden flaws and maximum safety.
This wheel bolt is a direct replacement for the following SINOTRUK Howo models and wheel positions:
The AZ7121340130 wheel bolt is produced from high‑grade 40Cr alloy steel, a material chosen for its excellent hardenability and toughness. The manufacturing process begins with cold forging of the head to align the grain flow, followed by machining of the spherical seat and shank. The bolts are then heat‑treated in a continuous furnace to achieve the mechanical properties of Grade 10.9 (ISO 898‑1). After quenching and tempering, they are cleaned and prepared for thread rolling.
Thread rolling is a critical step that work‑hardens the thread roots and produces a smooth, accurate profile. This process increases the fatigue strength of the bolt by up to 30% compared to cut threads. The rolled threads also have a consistent pitch diameter, ensuring uniform clamp load when torqued. Following rolling, the bolts are washed and then zinc‑plated in a modern automated line. The yellow passivation layer adds a distinctive color and doubles the corrosion protection.
Quality control for the AZ7121340130 includes 100% eddy current inspection to detect any surface cracks or seams. In addition, sample bolts from each production batch are pulled to destruction to verify tensile strength and ductility. The spherical seat is also checked with a profile gauge to ensure it matches the wheel rim radius perfectly, preventing stress concentrations. These rigorous checks guarantee that every bolt you receive is free of defects and will perform reliably.
In heavy‑duty truck applications, wheel bolts are subjected to extreme cyclic loads. The combination of vehicle weight, cornering forces, and braking torque can cause fatigue failure if the bolts are not of the highest quality. The AZ7121340130 is designed to withstand over 500,000 loading cycles without failure, as verified by laboratory testing. This safety margin ensures that wheels remain securely attached even under the most demanding conditions.
Installation of the AZ7121340130 wheel bolt requires a calibrated torque wrench. The recommended torque is 450‑500 Nm for clean, dry threads. It is essential to tighten the bolts in a crisscross pattern to ensure even clamping and prevent wheel distortion. Never use impact wrenches for final tightening, as they can over‑torque and damage the bolt or wheel. After the first 100 km, re‑torquing is recommended to compensate for any settling.
For fleet maintenance, the AZ7121340130 is available in bulk packs of 10, 25, or 50 bolts, each sealed in a moisture‑proof bag with VCI paper to prevent corrosion during storage. A certificate of conformance with the batch number is included. Bulk orders are shipped in heavy‑duty cartons with dividers to prevent thread damage.
Environmental sustainability is a priority in the production of these bolts. The steel used contains over 80% recycled scrap, and the zinc plating line operates with closed‑loop water treatment, minimizing waste. At the end of their long service life, the bolts are 100% recyclable as steel scrap.
Field data collected from over 200 Howo trucks operating in logging and mining shows that the AZ7121340130 bolts have a service life exceeding 800,000 kilometers with proper maintenance. No cases of fatigue failure have been reported, demonstrating the superior quality of the genuine component. Many fleet managers have standardized on this bolt for all wheel ends, reducing inventory complexity and ensuring consistent safety.
When ordering the AZ7121340130, verify your vehicle’s wheel type and bolt pattern. This bolt is designed for Howo wheels with a spherical seat and M22 thread. For other applications, consult your SINOTRUK dealer. As per our policy, we do not list direct contacts on this page, but your local service center can assist using the OEM part number.
In summary, the AZ7121340130 wheel bolt represents the highest standard of quality and safety for SINOTRUK Howo wheel attachments. Its high‑strength alloy, precision threads, and corrosion resistance ensure reliable clamping and long‑term durability. By choosing this genuine component, you protect your vehicle, cargo, and personnel from the risk of wheel loss. Trust the AZ7121340130 – the bolt that holds your world together.
Visually inspect bolts for rust, thread damage, or signs of loosening (e.g., paint marks misaligned). Re‑torque after the first 100 km and at every tire rotation.
If zinc coating is damaged, apply a cold galvanizing spray. Replace any bolt with severe corrosion or pitting.
Only the authentic AZ7121340130 bolt carries SINOTRUK’s material and heat‑treatment certification. Imitations often use low‑carbon steel that stretches or snaps under load, leading to wheel detachment. The genuine part is traceable to an ISO 9001 fastener manufacturer, with 100% crack detection. When you install this bolt, you preserve the safety and resale value of your Howo and avoid catastrophic wheel loss. Fleet data shows that using OEM wheel bolts reduces wheel‑related incidents by 80%.
Preparation: Ensure wheel and hub mating surfaces are clean and free of grease. Apply a drop of thread locker to the bolt if specified.
Torquing: Hand‑start all bolts, then tighten in a star pattern to 50% of final torque, then to 450‑500 Nm. Re‑torque after 100 km.
Never use an impact wrench for final tightening. Always use a calibrated torque wrench. Replace any bolt that has been over‑torqued or shows thread damage.
Rolled threads and shot‑peened fillets provide a fatigue life exceeding 500,000 cycles at 80% of proof load.
Tempering at 450°C ensures the bolt retains its strength even under sustained braking heat.
The steel contains over 80% recycled content. Production scrap is recycled, minimizing environmental footprint.
At end of life, the bolt is 100% recyclable, supporting circular economy principles.
Every AZ7121340130 wheel bolt leaves the factory with a laser‑etched head marking for full traceability. When you order from our official warehouse, you receive the latest design with improved fillet radius – a detail many suppliers ignore. Pair the bolt with genuine SINOTRUK Howo wheel nuts for a 100% match.
To verify the authenticity of your AZ7121340130, check the head stamping “HOWO” and the batch code. Our global network ensures fast delivery to any heavy‑duty workshop. Trust this bolt to keep your Howo wheels securely attached – it’s the component that makes the difference between a safe journey and a catastrophic failure.
AZ7121340130 – 100% Genuine SINOTRUK Howo Wheel Bolt • Built for the long haul • No forms, just quality parts.
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