S-94140A139 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through flex-top locking design that maintains secure fastening in high-motion environments
• Exceptional corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh conditions
• Space-saving thin profile (17/64" height) ideal for applications with limited clearance while maintaining full locking functionality
• Precise Class 2B thread fit ensures smooth installation and reliable engagement with mating components
• Easy installation and removal with standard external hex drive compatible with common wrench tools
• Coarse UNC thread pattern provides quick assembly and disassembly in industrial maintenance scenarios
• Full regulatory compliance with RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This 5/16"-18 UNC thin locknut delivers critical vibration-resistant performance where standard fasteners fail. The 18-8 stainless steel construction provides excellent corrosion resistance for outdoor equipment, marine applications, and chemical processing environments. The flex-top locking mechanism creates consistent friction against the mating bolt, preventing loosening under dynamic loads without damaging threads. The thin profile makes it ideal for compact assemblies in automotive, machinery, and electrical enclosures where space optimization is crucial. With external hex drive compatibility, maintenance teams can achieve proper torque values using standard tools, reducing installation time and ensuring consistent clamping force across multiple connection points.

Specification Summary & Compliance

This locknut features 5/16"-18 UNC coarse threads with Class 2B thread fit per ASME B1.1 standards, ensuring precise dimensional accuracy and reliable performance. The external hex drive measures 1/2" across flats with a total height of 17/64" in thin profile configuration. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for global industrial applications requiring environmentally compliant fastening solutions.