S-90631A006 5-40 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking technology that maintains secure fastening in high-motion environments
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial conditions
• Reliable high-temperature performance with nylon insert rated to maintain locking capability up to 220°F (104°C)
• Precise thread engagement with Class 2B thread fit ensuring consistent torque values and reduced cross-threading risk
• Quick installation and removal with standard external hex drive design compatible with common wrench tools
• Optimized for coarse thread applications using UNC 5-40 thread pattern for faster assembly in general purpose fastening
• Right-hand threading compatibility with standard rotation direction for intuitive installation

Professional Applications & Engineering Value

This 5-40 UNC nylon insert locknut delivers critical vibration resistance for machinery, automotive, and electrical assembly applications where loosening under dynamic loads poses significant reliability concerns. The zinc-plated steel construction provides essential corrosion protection while maintaining the mechanical strength required for industrial fastening. The nylon insert locking mechanism creates consistent friction against the mating bolt, effectively damping vibrations that would otherwise compromise standard nuts. With its coarse UNC thread profile and Class 2B thread fit, this locknut offers excellent engagement characteristics while accommodating typical manufacturing tolerances. The 220°F maximum temperature rating ensures performance stability across most industrial environments, making it suitable for motor mounts, conveyor systems, and equipment frames where thermal cycling occurs.

Specification Summary & Compliance

This locknut features precise Class 2B thread fit according to UNC standards with 5-40 coarse threading and right-hand direction. Manufacturing complies with industry standards for external hex drive locknuts with standard 1/4" width and 9/64" height dimensions. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (including 224 SVHC substances as of 06/10/2022), meeting stringent environmental and safety regulations for industrial components.