S-91853A535 1/2"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through cotter pin locking mechanism that prevents loosening in high-stress environments
• Excellent corrosion resistance provided by 18-8 stainless steel construction for extended service life in harsh conditions
• Precise thread engagement with Class 2B thread fit ensuring reliable fastening and consistent performance
• Easy installation and removal with external hex drive design compatible with standard wrench tools
• Enhanced safety and security through castle design with 1/8" cotter pin compatibility for critical applications
• Environmental compliance meeting both REACH and RoHS 3 standards for responsible manufacturing
• Optimized slot dimensions (0.15" depth and width) ensuring proper cotter pin retention and reliable locking

Professional Applications & Engineering Value

This stainless steel castle locknut delivers exceptional engineering value in applications where vibration-induced loosening poses significant safety risks. The 18-8 stainless steel material provides superior corrosion resistance while maintaining structural integrity in demanding environments. The 1/2"-20 UNF fine threads with Class 2B thread fit ensure precise mating with mating components, reducing the risk of cross-threading and ensuring consistent clamping force. The castle nut design with cotter pin locking offers a mechanical locking solution that remains effective even under extreme vibration conditions, making it ideal for automotive, machinery, and industrial equipment applications where reliable fastening is critical to operational safety and performance.

Specification Summary & Compliance

This castle locknut features 1/2"-20 UNF fine threads with Class 2B thread fit for precise dimensional accuracy. The external hex drive measures 3/4" across flats with a 9/16" height, designed for standard wrench compatibility. The locking mechanism accommodates 1/8" cotter pins with minimum slot dimensions of 0.15" depth and width. The product is manufactured in compliance with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring responsible material usage and manufacturing practices for industrial applications.