S-91837A265 1/2"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted top lock thread technology that maintains secure fastening under extreme conditions
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in harsh industrial environments
• Precise thread engagement with Class 2B thread fit ensuring reliable performance and consistent clamping force
• High-strength performance meeting Grade 2 specifications for demanding mechanical applications
• Easy installation and removal with standard external hex drive design compatible with common wrench tools
• Fine thread advantage providing better tension control and superior resistance to loosening compared to coarse threads
• Regulatory compliance assurance meeting both REACH and RoHS 3 standards for environmental and workplace safety

Professional Applications & Engineering Value

This 1/2"-20 UNF fine thread locknut with distorted top lock technology addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and heavy equipment. The zinc-plated steel construction provides essential corrosion resistance while maintaining the mechanical strength required for high-stress applications. Engineered with Class 2B thread fit, this external hex locknut ensures precise mating with corresponding fasteners, delivering reliable performance in assembly lines and maintenance operations where vibration resistance is paramount. The distorted thread locking mechanism creates consistent friction along the thread engagement, eliminating the need for additional locking components and reducing assembly time while providing permanent vibration protection.

Specification Summary & Compliance

This heavy-duty locknut features 1/2"-20 UNF fine threads with Class 2B thread fit tolerance, ensuring precise compatibility with standard UNF threaded components. The external hex design measures 3/4" across flats with a 7/16" height profile. Manufactured from Grade 2 zinc-plated steel, this top lock nut complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, making it suitable for regulated industrial applications requiring compliance with international safety and environmental protocols.