S-90949A025 5/16"-18 Flange Nuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread locking technology that maintains secure fastening under dynamic loads
• Enhanced corrosion protection with black phosphate steel coating that withstands harsh industrial environments
• Reliable mechanical performance with Grade G strength classification ensuring consistent load-bearing capacity
• Quick installation with standard external hex drive design compatible with common wrench tools
• Built-in flange functionality providing wider bearing surface (11/16" diameter) to distribute load and prevent surface damage
• Precise thread engagement with Class 2B thread fit and UNC coarse threads for reliable assembly in various applications
• Environmental compliance meeting RoHS 3 standards for restricted substance control in industrial settings

Professional Applications & Engineering Value

This Grade G flange locknut addresses critical vibration-induced loosening challenges in heavy machinery, automotive assemblies, and structural frameworks. The distorted thread locking mechanism creates consistent interference fit along the 5/16"-18 UNC coarse threads, eliminating the need for secondary locking devices while maintaining Class 2B thread precision. The black phosphate steel construction provides sacrificial corrosion protection, particularly valuable in environments exposed to moisture and chemicals. The integrated 11/16" flange serves as both a washer and nut, reducing assembly time and preventing joint damage through distributed clamping force. These engineering features make it ideal for vibration-resistant applications where maintenance access is limited and reliability is paramount.

Specification Summary & Compliance

Manufactured to precise dimensional standards including 1/2" width and 23/64" height with Class 2B thread fit tolerance. Features UNC coarse threads (5/16"-18) with right-hand direction and external hex drive. Compliant with RoHS 3 (2015/863/EU) regulations for hazardous substance restriction. The Grade G classification ensures consistent mechanical properties and performance reliability across industrial applications.