S-99291A620 5/8"-11 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread top lock technology that maintains clamp force under extreme conditions
• Enhanced corrosion protection with zinc-flake coating that provides excellent durability in harsh industrial environments
• Reliable mechanical strength meeting ASTM Grade C specifications for heavy-duty applications
• Precise thread engagement with Class 2B thread fit ensuring consistent performance and easy installation
• Industry-standard compatibility with 5/8"-11 UNC coarse threads for broad application across equipment and machinery
• Secure environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
• Optimized wrench engagement with standard 15/16" hex profile for straightforward installation and removal

Professional Applications & Engineering Value

This 5/8"-11 UNC locknut delivers critical vibration resistance where conventional fasteners fail. The distorted thread top lock design creates permanent friction that prevents loosening under dynamic loads, making it ideal for heavy machinery, construction equipment, and automotive applications. Manufactured from zinc-flake-coated steel, it provides superior corrosion protection compared to standard plating, extending service life in challenging environments. The ASTM Grade C material ensures consistent strength for high-stress applications, while the Class 2B thread fit guarantees smooth installation without compromising locking performance. These engineering features combine to solve common industrial challenges of maintenance reduction and operational safety in vibration-prone systems.

Specification Summary & Compliance

This external hex locknut features 5/8"-11 UNC coarse threads with Class 2B thread fit for standard industrial applications. The right-hand threaded fastener meets ASTM Grade C strength requirements and carries complete REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) compliance certifications. Physical dimensions include 15/16" width across flats and 35/64" height, conforming to standard hex nut profiles for universal tool compatibility.