S-94140A109 1/4"-28 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through Flex-Top locking technology that maintains secure fastening in high-motion environments
• Excellent corrosion resistance provided by 18-8 stainless steel construction for extended service life in harsh conditions
• Space-saving thin profile (7/32" height) ideal for applications with limited clearance while maintaining full locking performance
• Precise Class 2B thread fit ensures smooth installation and reliable engagement with mating components
• Enhanced torque transmission through external hex drive design for secure installation with standard tools
• Regulatory compliance assurance with RoHS 3 and REACH standards for safe use in regulated industries
• Fine thread configuration (1/4"-28 UNF) provides improved adjustment precision and better load distribution

Professional Applications & Engineering Value

This 1/4"-28 UNF thin Flex-Top locknut delivers critical vibration resistance where conventional fasteners fail. The 18-8 stainless steel construction provides inherent corrosion resistance, making it ideal for industrial applications exposed to moisture, chemicals, or outdoor elements. The thin profile design solves space constraint challenges in compact assemblies while the Flex-Top locking mechanism creates consistent friction against the mating thread, preventing loosening under dynamic loads. Particularly valuable in precision equipment, automotive systems, and machinery where fine thread accuracy and reliable locking are essential for operational safety and reduced maintenance intervals.

Specification Summary & Compliance

This locknut features 1/4"-28 UNF fine threads with Class 2B thread fit per Unified National Fine standards, ensuring precise dimensional accuracy and compatibility. The external hex drive measures 7/16" across flats with a total height of 7/32". Manufactured from 18-8 stainless steel with right-hand thread direction. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety standards for industrial fastener applications.