S-99291A310 7/8"-14 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted top-lock threads that maintain clamping force in high-shock environments
• Enhanced corrosion protection with zinc yellow-chromate plating that withstands harsh industrial conditions
• Reliable reusability allowing multiple installations without compromising locking performance
• Heavy-duty strength meeting ASTM Grade C specifications for demanding applications
• Precision fine threading (7/8"-14 UNF) ensuring secure fastening in critical assemblies
• Standard external hex drive for compatibility with common tools and easy installation
• Consistent thread engagement with Class 2B fit providing reliable performance across multiple uses

Professional Applications & Engineering Value

This 7/8"-14 UNF fine thread locknut delivers critical vibration resistance where conventional fasteners fail. The distorted thread locking mechanism at the top creates consistent friction that prevents loosening under extreme dynamic loads, making it ideal for heavy machinery, automotive systems, and industrial equipment. Manufactured from zinc yellow-chromate-plated steel, it provides exceptional corrosion resistance in challenging environments while maintaining ASTM Grade C strength requirements. The external hex drive ensures straightforward installation with standard tools, and the Class 2B thread fit guarantees precise engagement for reliable, reusable performance in critical assemblies where safety and durability are paramount.

Specification Summary & Compliance

This locknut features 7/8"-14 UNF fine threads with Class 2B thread fit for precision tolerance, right-hand thread direction, and top-lock distorted thread design. Dimensions include 1 5/16" width and 3/4" height. Manufactured to ASTM Grade C standards for mechanical properties and surface treatment. Compliant with industry standards for dimensional accuracy and performance in industrial applications.