S-90675A225 5/16"-24 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through integrated external-tooth lock washer that maintains clamping force in high-motion environments
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in industrial conditions
• Precise thread engagement with Class 2B thread fit ensuring reliable fastening and reduced risk of cross-threading
• Optimal torque transmission via external hex drive design for easy installation with standard tools
• Fine thread advantage with 5/16"-24 UNF specification providing better adjustment control and vibration resistance
• Regulatory compliance assurance meeting both REACH and RoHS 3 standards for safe industrial use
• Durable locking mechanism combining steel lock washer with standard hex nut profile for repeated use capability

Professional Applications & Engineering Value

This heavy-duty locknut addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and equipment manufacturing. The external-tooth lock washer creates permanent bite into mating surfaces, maintaining clamp load where conventional nuts fail. Manufactured from zinc-plated steel, it provides essential corrosion resistance for harsh environments while the UNF fine thread (5/16"-24) offers superior adjustment precision compared to coarse threads. The Class 2B thread fit ensures consistent engagement with male threads, reducing installation time and preventing galling. Ideal for vibration-resistant applications requiring reliable, reusable fastening solutions that meet stringent industry compliance standards.

Specification Summary & Compliance

This locknut features Class 2B thread fit per UNF standards with 5/16"-24 fine thread specification and right-hand direction. The external hex drive measures 1/2" across flats with 5/16" height profile. The integrated external-tooth lock washer (0.592" OD, steel construction) provides the primary locking mechanism. The assembly is fully compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations, ensuring suitability for industrial applications with strict material restrictions.