S-90040A143 5/8"-11 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread design that maintains secure fastening under dynamic loads
• Enhanced corrosion protection with zinc plating that extends service life in industrial environments
• Reliable performance in demanding applications with Grade 2 strength classification ensuring consistent mechanical properties
• Easy installation and removal with standard external hex drive design compatible with common tools
• Precise thread engagement with Class 2B thread fit providing optimal mating with male threads
• Quick assembly efficiency with coarse UNC thread pattern that reduces installation time
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for industrial safety

Professional Applications & Engineering Value

This Grade 2 zinc-plated steel locknut delivers exceptional engineering value through its center lock distorted thread technology, specifically designed to combat vibration-induced loosening in heavy machinery, automotive assemblies, and industrial equipment. The 5/8"-11 UNC coarse thread configuration ensures rapid installation while maintaining Class 2B thread fit precision for reliable performance. The zinc-plated steel construction provides crucial corrosion resistance in demanding environments, extending maintenance intervals and reducing downtime. Ideal for applications where vibration resistance is critical, this external hex locknut offers a cost-effective solution that maintains joint integrity without requiring additional locking components, streamlining assembly processes while ensuring long-term reliability.

Specification Summary & Compliance

This locknut features precise 5/8"-11 UNC coarse threads with Class 2B thread fit tolerance, ensuring optimal mating with corresponding male threads. The center lock distorted thread design provides consistent locking performance throughout the nut's service life. Manufactured from Grade 2 steel with zinc plating surface treatment, the nut measures 15/16" width and 35/64" height for standard application requirements. The product fully complies with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directives, meeting current environmental and safety standards for industrial components.