S-99291A290 3/4"-16 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted top lock thread technology that maintains clamp force under extreme conditions
• Enhanced corrosion protection with zinc yellow-chromate plating that withstands harsh industrial environments
• Reliable performance certification meeting ASTM Grade C standards for consistent quality and load-bearing capacity
• Precision fine threading with Class 2B fit ensures smooth engagement and eliminates cross-threading risks
• Optimized installation efficiency through standard external hex design compatible with common wrench tools
• Secure right-hand thread locking that prevents spontaneous loosening in high-vibration applications
• Dimensional stability with 1-1/8" width and 41/64" height for consistent performance across multiple installations

Professional Applications & Engineering Value

This 3/4"-16 UNF locknut delivers critical vibration resistance where conventional fasteners fail. The distorted thread locking mechanism creates permanent friction at the top engagement point, eliminating the need for secondary locking devices in heavy machinery, automotive assemblies, and industrial equipment. Manufactured from zinc yellow-chromate-plated steel, it provides exceptional corrosion resistance while maintaining the structural integrity required for high-stress applications. The fine UNF threading with Class 2B fit ensures precise mating with male threads, reducing installation time and preventing galling in frequent maintenance environments. This engineering solution addresses the primary challenge of maintaining preload in vibrating systems while offering superior environmental protection.

Specification Summary & Compliance

This industrial locknut features 3/4"-16 UNF fine threads with Class 2B thread fit per UNF standards, ensuring precise dimensional accuracy and compatibility. The external hex drive (1-1/8" width) conforms to standard wrenching practices, while the 41/64" height provides optimal thread engagement. Manufactured to ASTM Grade C specifications for mechanical properties and performance validation. The zinc yellow-chromate plating meets industry corrosion protection standards, and the product complies with RoHS and REACH environmental directives for industrial use.