S-90648A030 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Vibration-resistant locking with a durable nylon insert that prevents loosening under dynamic loads, ensuring secure fastening in high-stress environments.
• Enhanced torque application thanks to the extra wide hex profile, providing better grip and reducing the risk of tool slippage during installation.
• Corrosion protection from the zinc-plated steel construction, extending service life in humid or industrial settings.
• High-temperature durability with the nylon insert rated up to 250°F, maintaining locking performance in thermally demanding applications.
• Precise thread engagement with Class 2B UNC coarse threads, ensuring reliable fit and ease of assembly in right-hand threaded systems.
• Industrial compliance meeting RoHS 3 and REACH standards, making it suitable for regulated and environmentally conscious projects.
• Optimized dimensions (9/16" width and 7/16" height) for easy handling and compatibility with standard wrenches and equipment.

Professional Applications & Engineering Value

This 5/16"-18 nylon insert locknut is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in machinery and structural assemblies. The zinc-plated steel material provides a robust barrier against rust, ideal for outdoor or harsh environments, while the nylon insert offers consistent locking force without damaging threads, making it reusable and cost-effective. With its extra wide hex profile, it allows for higher torque application, reducing installation time and improving safety in automotive, construction, and manufacturing sectors. The UNC coarse threads and Class 2B fit ensure quick, reliable fastening, minimizing the risk of cross-threading and enhancing overall assembly efficiency in right-hand threaded systems.

Specification Summary & Compliance

This locknut features precise Class 2B thread fit with UNC coarse threads (5/16"-18) and right-hand direction, adhering to standard dimensional tolerances for reliable performance. It is manufactured from zinc-plated steel with an external hex drive and extra wide hex profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for industrial applications.