S-99291A270 9/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through top lock distorted thread design, preventing loosening in high-stress environments.
• Enhanced corrosion protection with zinc yellow-chromate plating, ensuring durability in harsh industrial conditions.
• Reliable fine thread engagement with 9/16"-18 UNF Class 2B fit, providing precise and secure fastening.
• High-strength performance meeting ASTM Grade C standards, suitable for heavy-duty applications.
• Easy installation and removal with standard external hex drive, compatible with common tools for efficient maintenance.
• Consistent quality assurance with distorted thread locking type, offering repeatable performance in assembly lines.

Professional Applications & Engineering Value

This 9/16"-18 UNF locknut is engineered to address critical challenges in industrial settings where vibration and dynamic loads compromise fastener integrity. The distorted thread locking mechanism creates intentional interference, resisting rotation under stress without requiring additional components like washers or adhesives. Made from zinc yellow-chromate-plated steel, it combats rust and corrosion in exposed or humid environments, extending service life in machinery, automotive assemblies, and structural frameworks. Its fine thread spacing ensures tighter grip and load distribution, making it ideal for precision equipment, while the external hex drive facilitates quick installation with standard wrenches, reducing downtime in maintenance cycles.

Specification Summary & Compliance

This locknut adheres to Class 2B thread fit tolerances for consistent engagement and is manufactured in compliance with ASTM Grade C strength requirements. It features UNF fine threads (9/16"-18) and a top lock distorted thread design, ensuring reliable performance in accordance with industrial standards. The product meets common regulatory guidelines for quality and safety in fastener applications.