S-90636A071 5/8"-11 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through precision center lock distorted threads that maintain clamping force in high-stress environments
• Exceptional corrosion protection with zinc yellow-chromate plating that withstands harsh industrial conditions
• Heavy-duty performance backed by Grade 8 strength classification for demanding applications
• Reliable locking security with distorted thread design that prevents loosening under dynamic loads
• Easy installation and removal using standard external hex drive with familiar 15/16" width
• Precise thread engagement with Class 2B thread fit ensuring consistent performance across assemblies
• Broad compatibility with UNC coarse 5/8"-11 threads commonly used in industrial equipment

Professional Applications & Engineering Value

This Grade 8 heavy-duty locknut delivers critical vibration resistance in demanding industrial applications where fastener failure is not an option. The center lock distorted thread design creates permanent mechanical interference that prevents rotation and maintains preload, even under extreme vibration conditions common in heavy machinery, automotive systems, and construction equipment. Manufactured from zinc yellow-chromate plated steel, these locknuts provide dual protection against both corrosion and loosening, significantly extending service life in outdoor or chemically aggressive environments. The UNC coarse thread profile ensures rapid installation while maintaining the structural integrity required for high-torque applications, making them ideal for critical connections in assembly lines, power transmission systems, and structural frameworks where reliability is paramount.

Specification Summary & Compliance

This locknut features 5/8"-11 UNC coarse threads with Class 2B thread fit for precise engagement and consistent performance. The external hex drive with standard profile measures 15/16" across flats and 35/64" in height. Manufactured to Grade 8 strength requirements with right-hand thread direction and center lock distorted thread locking mechanism. The zinc yellow-chromate plating provides corrosion resistance while maintaining compliance with industrial fastener standards for heavy-duty applications.