Secondary Shaft Nut: Ensuring the Stability and Longevity of your Transmission
A high-precision mechanical fastening for absolute road safety
The nut The secondary shaft/shaft sprocket is a critical safety component located at the very heart of the gearbox in your heavy and light vehicles. Its role is essential to the proper functioning of the drivetrain: maintaining the secondary shaft gears under a constant and precise axial preload to guarantee perfect gear alignment. Even a minor failure at this point can lead to asymmetrical play, transmission misalignment, premature wear of the gear teeth, or even a major mechanical failure while driving, instantly immobilizing the vehicle.
With sustainable marketing and the circular economy in mind, this nut was developed to offer maximum mechanical longevity. By extending the operational lifespan of the entire gearbox, it prevents the premature replacement of heavy, complex, and extremely resource-intensive components. Choosing a high-quality fastener drastically reduces the overall carbon footprint associated with major vehicle maintenance while ensuring safer journeys.
Technical specifications and eco-efficient design
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High-performance alloy steel: Made from superior grade steel, heat-treated by case hardening and tempering to withstand extreme tightening torques applied during assembly, as well as continuous high-frequency vibrations.
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Integrated self-braking system: Equipped with an active safety locking device (precision crimping collar or high-temperature friction ring) designed to prevent any accidental loosening under the effect of cyclic forces and torque reversals of the transmission.
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High-precision micrometric threading: Tight tolerance machining ensures perfectly even distribution of mechanical stresses on the shaft threads. This eliminates the risk of seizing during assembly and preserves the integrity of the secondary shaft for future maintenance.
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Eco-friendly anti-corrosion surface treatment: Latest generation protective coating, applied without hexavalent chromium (compliant with REACH standards), offering excellent resistance to chemical attack from hot gearbox oils and Extreme Pressure (EP) additives.
Key benefits for your vehicle
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Flawless technical security and dynamic stability: Optimal transmission locking prevents unwanted gear changes and ensures safe overall vehicle handling. Whether under heavy loads uphill for a truck or at high speeds on the highway for a car, the gearbox stability remains unchanged.
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Mechanical durability and eco-responsibility: Thanks to its superior resistance to metal fatigue, this nut protects tapered roller bearings and adjacent gears from uneven wear. A perfectly aligned transmission generates less internal friction, resulting in optimized energy efficiency and a slight reduction in fuel consumption.
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Waste reduction and streamlined maintenance: A reliable, long-term fastening component reduces the frequency of complex gearbox openings. This directly limits waste and the recycling of used transmission oils, while also avoiding the preventive replacement of secondary wear parts (seals, circlips, shims).
International safety certifications and standards
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Mechanical conformity to ISO 898-2: Ensures strict compliance with quality classes, elastic limits and mechanical properties required for fasteners subjected to high tensile and shear stresses.
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IATF 16949 Automotive Quality Certification: This product is manufactured to the highest production standards in the global automotive industry, ensuring full batch traceability and reliability identical to original equipment manufacturer (OEM) parts.
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ISO 14001 Environmental Commitment: The manufacturing cycle is part of eco-responsible processes, aiming to reduce the energy consumption of heat treatment furnaces and to 100% % recovery of steel chips from machining centers.
Target audience: Truck and car owners, and mechanics
Whether you are a heavy goods vehicle fleet manager seeking to maximize the uptime of your trucks, a car owner concerned about the safety of his family, or a professional mechanic Demanding in terms of the quality of its repairs, the choice of transmission components allows for no compromise. Opting for our high-strength secondary shaft nut means choosing the transparency of absolute technical safety combined with the performance of a part designed to last, minimizing both your operating mileage costs and your environmental impact.
