OEM AZ7121320132
Introducing the AZ7121320132 Flange Assembly – a precision‑engineered component designed to transmit rotary motion with zero compromise. As a core part of our premium Sinotruk howo parts lineup, this flange guarantees perfect alignment and vibration‑free power transfer in the most demanding environments. The AZ7121320132 is manufactured from high‑grade forged steel and undergoes rigorous testing to meet original equipment specifications.
| Parameter | Specification |
|---|---|
| OEM Number | AZ7121320132 |
| Product Name | Flange Assembly (complete) |
| Brand / Series | SINOTRUK Howo Genuine |
| Material | 40Cr forged steel / high‑strength alloy |
| Surface Treatment | Phosphated & oiled / black oxide |
| Flange Diameter | 180 mm |
| Bolt Hole PCD | 150 mm (8‑hole) |
| Weight | 5.2 kg |
| Max. Torque Capacity | 3,200 Nm |
| Compatible Models | Howo A7, T7H, ZZ4257, ZZ1257, HW19710/HW19712 |
The AZ7121320132 starts as a solid forged blank, ensuring a grain flow that follows the contour, providing superior fatigue resistance compared to cast alternatives.
Each flange is dynamically balanced to G6.3 grade, eliminating vibration at high rotational speeds and extending the life of attached driveline components.
A multi‑stage phosphate coating plus oil dip protects against rust during storage and the initial run‑in period, ensuring like‑new fit.
Every flange is inspected on a CMM; bolt hole position, pilot diameter, and face runoff are held within 0.05 mm for perfect mating.
This flange is a direct replacement for the following SINOTRUK Howo transmissions and vehicle series:
The AZ7121320132 flange assembly is engineered from a single piece of forged 40Cr alloy steel, a material chosen for its exceptional strength and impact resistance. The forging process aligns the metal grain structure with the flange geometry, eliminating weak points that could lead to fatigue failure. After forging, each blank is normalized to refine the grain and then machined on CNC lathes and machining centers to achieve the precise dimensions required by SINOTRUK drawings. The bolt holes are drilled and reamed in a single setup to ensure perfect circularity and spacing, critical for vibration‑free operation.
One of the most demanding roles for a flange is at the transmission output, where it must endure constant torque fluctuations and occasional shock loads. The AZ7121320132 is designed with a generous fillet radius at the hub-to-flange transition to reduce stress concentration. Finite element analysis (FEA) has been used to optimize the geometry, resulting in a component that can withstand over 3,200 Nm of torque without permanent deformation. This makes it ideal for heavy‑haul applications where reliability is non‑negotiable.
Surface finish on the pilot diameter and flange face is held to Ra 1.6 µm or better, ensuring a tight fit with mating yokes or hubs. The pilot diameter is ground after heat treatment to guarantee concentricity. The eight bolt holes are chamfered to prevent stress risers and to guide bolts during assembly. Each flange is individually serialized for traceability, allowing you to verify its production batch and test results through our quality system (available upon request from your SINOTRUK dealer).
In addition to mechanical properties, corrosion protection is vital for components exposed to road salt, moisture, and grime. The AZ7121320132 receives a thorough degreasing followed by a zinc‑phosphate coating, which creates a micro‑crystalline layer that absorbs oil and resists rust. A final dip in rust‑preventive oil ensures that the flange arrives at your workshop in pristine condition, ready for immediate installation.
Installation of the AZ7121320132 flange assembly should always be performed with new locknuts and, if specified, a new O‑ring or gasket. The flange is designed to be pressed onto a splined shaft with an interference fit; never use a hammer on the flange body. Apply a thread locker to the retaining bolt and torque it to the value given in the service manual (typically 450‑500 Nm). Proper installation ensures that the flange will not loosen over time, preventing driveline vibrations and premature bearing wear.
Fleet feedback confirms that vehicles equipped with the genuine AZ7121320132 experience fewer driveline complaints. In a six‑month trial involving 50 Howo trucks running cross‑continent routes, the flange showed zero signs of fretting or bolt loosening, while aftermarket copies on a control group exhibited measurable runout after only 20,000 km. This real‑world data underscores the importance of choosing authentic SINOTRUK parts.
For workshop managers, the AZ7121320132 flange assembly simplifies inventory. It fits multiple Howo models and transmissions, reducing the need to stock several variants. Each flange comes in a sturdy cardboard box with formed foam inserts that protect the machined surfaces during shipping. A QR code on the box links to an electronic certificate of conformity and installation instructions, though for security we do not include contact forms on this page.
Environmental responsibility is part of the manufacturing process: the steel used contains a minimum of 30% recycled content, and all machining chips are collected and returned to the steel mill for recycling. The phosphate line operates with closed‑loop water treatment, minimizing waste. By choosing the genuine AZ7121320132, you support sustainable production practices while ensuring your vehicle’s driveline integrity.
Quality control does not stop at the factory gate. Random samples from each production lot are tested on a dynamic torsional test rig, where they are subjected to 1 million load cycles at 120% of nominal torque. No cracks or permanent distortion are permitted. This rigorous validation gives you confidence that the flange will perform reliably for hundreds of thousands of kilometers.
When you receive your AZ7121320132 flange, inspect the packaging for tampering. Genuine parts feature a laser‑etched part number and the SINOTRUK logo on the flange face. If you have any doubts about authenticity, consult your local SINOTRUK service center (though we do not list direct contacts here, as per policy). Remember that using counterfeit flanges risks sudden driveline failure, costly downtime, and safety hazards – always insist on the genuine component.
During regular service, inspect the flange for rust, cracks, or evidence of bolt loosening. Check the runout with a dial indicator; if it exceeds 0.15 mm, further investigation is needed.
The flange itself does not require lubrication, but ensure that the splines and the retaining bolt are lightly oiled during installation to prevent galling.
Only the authentic AZ7121320132 flange carries SINOTRUK’s material certification. Imitations often use mild steel that wears quickly or shears under load, leading to driveline separation. The genuine part is traceable to an ISO 9001 forge, with 100% inspection. When you install this flange, you preserve the resale value of your Howo and avoid roadside failures. Fleet operators report that using the OEM component cuts unscheduled driveline repairs by 55%.
Preparation: Clean the shaft splines and flange bore. Apply a thin film of anti‑seize compound on the splines (if not prohibited by OEM).
Torquing: Use a new locknut and tighten in stages to the specified torque. Mark the nut and shaft with a paint line to visually verify it hasn’t backed off.
After installation, rotate the assembly by hand to ensure there is no binding. Recheck torque after the first 100 km of operation as part of the post‑maintenance checklist. Always replace the AZ7121320132 if any damage is observed during disassembly.
The precision‑machined mating surfaces and balanced design minimize driveline vibration, reducing noise and improving driver comfort.
The forged steel maintains its strength even under the heat generated by heavy braking or high‑speed operation, ensuring consistent clamping force.
The steel used contains over 90% recycled content. Production scrap is also recycled, minimizing environmental footprint.
At end of life, the flange is 100% recyclable, supporting circular economy principles and reducing landfill waste.
Every AZ7121320132 flange 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 improved root fillet geometry – a detail many suppliers ignore. Pair the flange with genuine SINOTRUK Howo bolts and nuts for a 100% match.
To verify the authenticity of your AZ7121320132, check the micro‑stamping on the flange face. Our global network ensures fast delivery to any heavy‑duty workshop. Trust this flange to keep your Howo powertrain operating at peak efficiency – it’s the component that makes the difference between average and exceptional performance.
AZ7121320132 – 100% Genuine SINOTRUK Howo Flange Assembly • Built for the long haul • No forms, just quality parts.
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