S-90949A112 5/8"-18 Flange Nuts

Key Features & Benefits at a Glance

• Distorted thread locking technology provides reliable vibration resistance without requiring additional locking components
• 1-21/64" flange diameter distributes clamping force over wider surface area, reducing material stress and preventing loosening
• Black phosphate steel coating offers superior corrosion protection in harsh industrial environments
• Grade G strength classification ensures consistent performance under heavy loads and high-stress applications
• UNF fine thread configuration delivers precise engagement and superior holding power compared to coarse threads
• Class 2B thread fit guarantees smooth assembly while maintaining secure fastening integrity
• External hex drive design enables easy installation with standard wrenches and sockets

Professional Applications & Engineering Value

This Grade G flange locknut addresses critical vibration-induced loosening challenges in heavy machinery and automotive systems. The distorted thread locking mechanism creates permanent friction along the mating surface, eliminating the need for separate lock washers while maintaining UNF fine thread precision. The integrated 1-21/64" flange acts as a built-in washer, distributing clamp load across broader contact areas to prevent surface damage and maintain joint integrity under dynamic loads. Manufactured from black-phosphate steel, this nut provides essential corrosion resistance for equipment exposed to oils, lubricants, and industrial atmospheres. The external hex drive ensures compatibility with standard industrial tools, streamlining assembly processes in manufacturing and maintenance operations.

Specification Summary & Compliance

This 5/8"-18 UNF flange locknut features Class 2B thread fit per UNF standards, ensuring proper engagement with mating components. The nut conforms to Grade G strength classification requirements and carries RoHS 3 (2015/863/EU) compliance certification for environmental safety. With dimensions including 15/16" width, 11/16" height, and 0.1" flange thickness, this heavy-duty fastener meets industrial specifications for right-hand thread applications requiring reliable, vibration-resistant locking performance.