S-91839A140 7/16"-20 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through the unique flex-top locking design that maintains clamp force 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 performance and consistent torque values
• Easy installation and removal with standard external hex drive compatible with common wrenching tools
• Fine thread configuration (UNF 7/16"-20) offering better tension control and superior holding power compared to coarse threads
• Environmental compliance meeting RoHS 3 and REACH standards for use in regulated industrial applications
• Standard hex profile (5/8" width) providing familiar handling and tool compatibility across maintenance operations

Professional Applications & Engineering Value

This 7/16"-20 UNF flex-top locknut delivers critical vibration resistance in demanding industrial applications where loosening under dynamic loads poses significant safety risks. The 18-8 stainless steel construction provides inherent corrosion resistance, making it ideal for chemical processing, marine environments, and food processing equipment where moisture and corrosive agents are present. The flex-top locking mechanism creates consistent friction along the thread engagement, eliminating the need for additional locking devices while maintaining reliable clamp force. With its external hex drive and standard profile, installation and maintenance are streamlined using conventional tools, reducing downtime in assembly lines and machinery maintenance. The fine thread pitch offers superior tension control for precision applications in automotive, aerospace, and heavy equipment where vibration-induced failure is not an option.

Specification Summary & Compliance

This locknut features Class 2B thread fit per UNF standards, ensuring precise dimensional accuracy and reliable thread engagement. Manufactured to exacting specifications with dimensions of 5/8" width and 15/32" height. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (including 224 SVHC substances as of 06/10/2022), meeting the strictest environmental regulations for industrial fasteners. The right-hand UNF fine thread (7/16"-20) follows established industrial standards for compatibility and performance consistency across applications.