OEM AZ9003888457
Experience unmatched fastening security with the AZ9003888457 Self-Locking Nut, a precision‑engineered fastener designed for SINOTRUK Howo heavy‑duty transmissions and driveline applications. This genuine nut is a cornerstone of our premium Sinotruk howo parts portfolio. Manufactured from high‑strength alloy steel and featuring an integrated nylon locking insert, the AZ9003888457 nut provides consistent prevailing torque, preventing loosening under extreme vibration and ensuring long‑term reliability.
| Parameter | Specification |
|---|---|
| OEM Number | AZ9003888457 |
| Product Name | Self-Locking Nut (Nylon Insert) |
| Material | 45H / 40Cr alloy steel |
| Thread Size | M18 x 1.5 |
| Height | 16 mm |
| Width Across Flats | 27 mm |
| Strength Class | 10 (ISO 898-2) |
| Locking Type | Nylon insert (polyamide 6.6) |
| Surface Finish | Zinc‑plated / yellow passivated |
| Compatible Models | Howo HW19710 / HW19712, A7, T7H, ZZ4257, ZZ1257 |
The nylon insert deforms elastically as the bolt engages, creating consistent friction that resists loosening even under severe vibration and shock loads.
Threads are rolled to Class 6H tolerance, ensuring a perfect fit with mating bolts and consistent torque readings.
Zinc plating with yellow passivation provides excellent protection against rust, even in salt‑laden environments.
Every nut is checked for thread quality, insert integrity, and dimensional accuracy, guaranteeing zero defects.
This self‑locking nut is used in the following SINOTRUK Howo critical fastening points:
The AZ9003888457 self‑locking nut is an essential fastener for any application where vibration could cause standard nuts to loosen. It is manufactured from high‑grade 40Cr alloy steel, which is cold‑formed to shape and then heat‑treated to achieve the required strength (property class 10). The threads are rolled after heat treatment, improving fatigue resistance and ensuring a smooth, consistent surface. A nylon (polyamide 6.6) insert is then ultrasonically welded into a captive annular groove at the top of the nut. This insert deforms elastically as the bolt threads engage, creating a strong frictional grip that resists back‑off even under severe dynamic loads.
In heavy‑duty SINOTRUK Howo trucks, critical fasteners are subjected to continuous vibration from the engine, driveline, and road inputs. The AZ9003888457 nut provides a reliable locking solution that does not rely on thread deformation or chemical adhesives. It can be reused multiple times (up to 5 times per ISO standards) while still retaining a significant prevailing torque, making it ideal for maintenance operations where components are frequently disassembled.
Installation of this self‑locking nut is straightforward. Simply thread it onto the bolt by hand until resistance is felt, then tighten with a torque wrench to the specified value (typically 180‑200 Nm for M18 grade 10). The nylon insert will generate additional resistance, but this is included in the overall torque reading. Never use impact wrenches for final tightening, as they can damage the insert. After installation, a visual inspection should confirm that the bolt protrudes at least one full thread beyond the nut.
Quality control for the AZ9003888457 includes 100% visual inspection of the insert for cracks or misalignment, and thread gauging to ensure fit. Samples from each batch are subjected to prevailing torque tests (both first installation and after five removals) to verify compliance with ISO 2320. Hardness and proof load tests are also performed regularly to guarantee mechanical properties.
Environmental responsibility is embedded in production. The steel contains a high percentage of recycled content, and all manufacturing scrap is recycled. The zinc plating process is environmentally controlled with minimal waste. The nylon insert is free from hazardous substances and meets RoHS requirements. At the end of its service life, the nut is fully recyclable as steel scrap; the nylon insert is separated and can be processed as industrial waste.
For maintenance departments, the AZ9003888457 self‑locking nut is available individually or in multi‑packs. Each nut is packaged in a protective bag to prevent corrosion. Bulk orders are shipped in partitioned boxes with clear labeling. A certificate of conformance with batch test data is included with every shipment.
Field feedback from over 150 fleet workshops indicates that using genuine AZ9003888457 nuts eliminates fastener loosening issues, a common problem with standard nuts or inferior aftermarket locking nuts that lose their grip after a few cycles. Technicians report consistent torque retention even after thousands of kilometers in harsh conditions.
When ordering, always verify the thread size and strength class. The AZ9003888457 is specifically designed for M18 x 1.5 applications. For other thread sizes, consult the SINOTRUK parts catalog. Technical support is available through your local dealer – no contact details are listed here, in line with our policy.
In summary, the AZ9003888457 self‑locking nut is a small but vital component that ensures the integrity of critical connections in your SINOTRUK Howo vehicle. Its robust construction, precision threads, and proven nylon insert technology make it the ideal choice for any heavy‑duty application where loosening is not an option.
During service, inspect the AZ9003888457 nut for signs of corrosion, thread damage, or cracked nylon insert. If the insert is damaged or missing, replace the nut immediately. Check that the nut can be run down by hand until the insert engages.
Self‑locking nuts can be reused up to five times if the insert remains intact and prevailing torque still meets specification. However, for critical safety applications, always use new nuts.
Only the authentic AZ9003888457 self‑locking nut uses the exact steel grade, heat treatment, and nylon material specified by SINOTRUK. Imitations often use lower‑grade steel that can strip or nylon that melts or cracks, leading to loosening and component failure. The genuine nut is 100% tested for prevailing torque and traceable to an ISO 9001 certified facility. Fleet data shows that OEM self‑locking nuts reduce fastener‑related failures by 70%.
Preparation: Clean the bolt threads and ensure they are free of debris. The AZ9003888457 nut should spin freely by hand until the insert contacts the threads.
Tightening: Use a calibrated torque wrench to tighten the nut to the specified torque (e.g., 190 Nm). Do not use impact tools, as they can damage the nylon insert.
After installation, mark the nut and bolt with a torque stripe for visual inspection. If the nut is removed, inspect the insert for damage before reusing.
The nylon insert maintains prevailing torque even under extreme vibration, preventing loosening and reducing maintenance intervals.
The nylon insert is rated for continuous use from -40°C to +120°C, ensuring reliable locking in all climates.
Steel contains >85% recycled content; 100% of machining scrap is recycled.
At end of life, the nut is 100% recyclable; nylon insert can be separated and recycled.
Every AZ9003888457 self‑locking nut is laser marked with the part number for easy identification. When you order from our official distribution channel, you receive the latest production batch with consistent locking torque and superior corrosion protection.
To verify authenticity, check the smooth zinc finish and the precise part number stamping. Our global network ensures rapid delivery to any heavy‑duty workshop. Trust this self‑locking nut to keep your Howo components securely fastened – it’s the small part that makes a big difference.
AZ9003888457 – 100% Genuine SINOTRUK Howo Self-Locking Nut • Built for the long haul • No forms, just quality parts.
