S-90519A205 1/4"-28 Hex Nuts

Key Features & Benefits at a Glance

• Enhanced reverse-thread security with left-hand threading prevents loosening in counter-rotating applications
• Superior fine thread engagement with UNF 1/4"-28 specification provides increased vibration resistance and better tension control
• Reliable Grade 2 steel construction offers excellent strength-to-weight ratio for general industrial applications
• Precision Class 2B thread fit ensures smooth assembly and consistent clamping force throughout the fastener system
• Standard external hex drive design enables quick installation with common tools while maintaining wrenching accessibility
• Compact 7/16" width profile allows installation in confined spaces without compromising structural integrity
• Environmental compliance assurance with RoHS 3 and REACH standards meets rigorous industrial safety requirements

Professional Applications & Engineering Value

This left hand thread hex nut addresses critical challenges in rotating machinery and equipment where reverse rotation occurs. The UNF fine thread configuration with Class 2B fit provides superior resistance to vibrational loosening compared to coarse threads, making it ideal for precision equipment, automotive systems, and manufacturing machinery. The Grade 2 steel construction balances durability with cost-effectiveness for general industrial use, while the standard external hex drive ensures compatibility with existing tooling. Engineered specifically for applications requiring counter-clockwise tightening, this nut prevents accidental disassembly in right-hand rotating systems, enhancing operational safety in conveyor systems, pump assemblies, and power transmission equipment where reverse threading is essential for maintaining secure connections under dynamic loads.

Specification Summary & Compliance

This hex nut features precise 1/4"-28 UNF left hand fine threads with Class 2B thread fit per Unified National Fine standards, ensuring dimensional accuracy and reliable performance. The standard hex nut profile measures 7/16" across flats with 7/32" height, manufactured from Grade 2 steel for consistent mechanical properties. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, meeting current regulatory requirements for industrial components. The inch system measurement and external hex drive configuration adhere to industry-standard specifications for seamless integration into existing assembly processes.