S-90040A140 1/2"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread design that maintains secure fastening in high-stress environments
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding industrial conditions
• Precise thread engagement with Class 2B thread fit ensuring reliable performance and easy installation
• Optimal torque transmission via standard external hex drive design for efficient assembly with common tools
• Fine thread advantage providing better tension control and improved resistance to loosening under dynamic loads
• Regulatory compliance meeting both RoHS 3 and REACH standards for safe industrial usage
• Grade 2 strength classification delivering dependable performance for medium-duty applications

Professional Applications & Engineering Value

This 1/2"-20 UNF fine thread locknut with center lock distorted thread technology addresses critical vibration-induced loosening challenges in industrial settings. The zinc-plated steel construction provides essential corrosion resistance while maintaining the Grade 2 strength required for automotive assemblies, heavy machinery, and construction equipment. The distorted thread design creates consistent interference along the mating threads, eliminating the need for additional locking components and reducing assembly time. Engineered with external hex drive compatibility, these locknuts integrate seamlessly into existing maintenance protocols while delivering reliable performance in high-vibration environments where traditional fasteners typically fail.

Specification Summary & Compliance

This distorted thread locknut features 1/2"-20 UNF fine threads with Class 2B thread fit tolerance for precise engagement. The fastener meets Grade 2 strength classification requirements and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Physical dimensions include 3/4" width across flats and 7/16" height, designed for standard wrench applications. The right-hand thread direction and center lock distortion provide consistent locking performance across industrial applications requiring reliable vibration resistance.