S-90673A102 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread top lock design, ensuring reliable performance in high-stress environments
• Enhanced durability and corrosion protection with black-oxide steel construction, extending service life in harsh industrial conditions
• High-strength Grade 5 classification for dependable load-bearing capacity in demanding applications
• Precise UNC coarse threading with Class 2B fit for easy installation and consistent engagement with mating components
• External hex drive compatibility allowing for standard tool usage and straightforward assembly
• Compliance with REACH and RoHS 3 standards ensuring environmental safety and regulatory adherence
• Right-hand thread direction facilitating intuitive installation and reducing assembly errors

Professional Applications & Engineering Value

This Grade 5 black-oxide steel locknut is engineered to address critical vibration-induced loosening in industrial machinery, automotive assemblies, and structural frameworks. The distorted thread top lock mechanism creates consistent interference fit, maintaining clamp load under dynamic stresses without requiring additional locking devices. Its UNC coarse thread profile ensures rapid installation and reliable performance in high-vibration environments like heavy equipment and manufacturing systems. The black-oxide surface treatment provides corrosion resistance, making it suitable for both indoor and outdoor applications where moisture or chemical exposure may occur. This combination of locking technology and material strength delivers long-term reliability while reducing maintenance frequency and downtime.

Specification Summary & Compliance

This locknut features 5/16"-18 UNC coarse threads with Class 2B thread fit for standard tolerance applications. Manufactured to industry standards for external hex drive locknuts, it complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental regulations. The Grade 5 strength classification ensures consistent mechanical properties, while the distorted thread top lock design maintains locking performance without compromising reusability.