S-90636A043 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread design that maintains secure fastening under dynamic loads
• Exceptional corrosion protection with zinc yellow-chromate plating that withstands harsh industrial environments
• Heavy-duty performance guaranteed by Grade 8 steel construction for high-strength applications
• Reliable thread engagement with UNC coarse thread pattern ensuring quick installation and secure fit
• Industry-standard compatibility with Class 2B thread fit providing precise tolerance matching
• Easy installation and removal using standard external hex drive for convenient tool access
• Optimized dimensional stability with 1/2" width and 17/64" height for consistent performance in confined spaces

Professional Applications & Engineering Value

This Grade 8 heavy-duty locknut delivers critical vibration resistance for demanding industrial applications where safety and reliability are paramount. The center lock distorted thread technology creates consistent friction along the mating surface, effectively preventing loosening from machinery vibration, impact loads, and thermal cycling. Manufactured from high-strength steel with zinc yellow-chromate plating, this UNC coarse thread locknut provides dual protection against corrosion while maintaining structural integrity in harsh operating conditions. The external hex drive design ensures straightforward installation with standard tools, making it ideal for assembly lines, heavy equipment maintenance, and structural frameworks where vibration-resistant fastening solutions are essential for operational safety and reduced maintenance downtime.

Specification Summary & Compliance

This locknut features precision 5/16"-18 UNC coarse threads with Class 2B thread fit ensuring consistent mating with standard bolts. The manufacturing process adheres to industrial standards for Grade 8 strength classification, providing reliable performance in high-stress applications. The zinc yellow-chromate plating offers superior corrosion resistance while maintaining compliance with industry requirements for surface treatments. Dimensions include 1/2" width across flats and 17/64" height for standardized installation. The right-hand thread direction and external hex drive style ensure compatibility with conventional fastening systems and tools commonly used in industrial settings.