S-91839A127 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Reliable vibration resistance through Flex-Top locking technology that maintains secure fastening in high-motion environments
• Excellent corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh industrial conditions
• Easy installation and removal with standard external hex drive that accommodates common wrench tools
• Consistent thread engagement with Class 2B thread fit ensuring proper mating with male threaded components
• Durable coarse threading using UNC 5/16"-18 threads that resist cross-threading and provide quick assembly
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe use across regulated industries
• Standard dimensional profile with 1/2" width and 23/64" height for compatibility with existing assembly designs

Professional Applications & Engineering Value

This 5/16"-18 UNC locknut delivers critical vibration resistance where conventional fasteners fail. The Flex-Top locking mechanism creates consistent friction against mating threads, preventing loosening under dynamic loads in machinery, automotive, and industrial equipment applications. Manufactured from 18-8 stainless steel, this external hex locknut maintains integrity in corrosive environments while the coarse thread design enables rapid assembly in production settings. The Class 2B thread fit ensures reliable engagement with standard bolts, reducing installation errors and rework. Ideal for maintenance operations and OEM applications requiring dependable, reusable locking solutions that meet stringent industry compliance standards.

Specification Summary & Compliance

This locknut features UNC 5/16"-18 coarse threads with Class 2B thread fit per ASME B1.1 standards, ensuring dimensional accuracy and compatibility. The external hex drive measures 1/2" across flats with a 23/64" height profile. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming restriction of hazardous substances. Right-hand thread direction and standard hex nut profile provide consistent performance across industrial fastener applications.