S-99183A490 M12 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through precision distorted top-lock threads that maintain clamp force in high-stress environments
• Exceptional corrosion protection with zinc yellow-chromate plating that withstands harsh industrial conditions
• Heavy-duty performance guaranteed by Class 10 strength rating for demanding automotive and machinery applications
• Reliable fine thread engagement with M12x1.25mm metric fine threads providing superior holding power
• Industry-standard compatibility with Class 6H thread fit ensuring precise mating with standard bolts
• Easy installation and removal using standard 19mm external hex drive for efficient maintenance
• Optimized locking performance with distorted thread design that eliminates the need for additional locking components

Professional Applications & Engineering Value

This Class 10 heavy-duty locknut delivers critical vibration resistance in demanding industrial environments where fastener failure is not an option. The distorted top-lock thread design creates consistent interference that prevents loosening under extreme dynamic loads, making it ideal for automotive assemblies, heavy machinery, and industrial equipment subject to constant vibration. The zinc yellow-chromate plating provides dual-layer corrosion protection, significantly extending service life in humid or chemically aggressive environments. With M12 fine thread pitch (1.25mm), this locknut offers superior thread engagement and load distribution compared to coarse thread alternatives, ensuring reliable performance in critical applications where safety and reliability are paramount.

Specification Summary & Compliance

Manufactured to precise metric fine thread specifications (M12x1.25mm) with Class 6H thread fit tolerance for optimal compatibility. Features distorted top-lock thread type with right-hand thread direction and standard hex profile (19mm width, 12mm height). Constructed from high-strength steel meeting Class 10 strength requirements and finished with corrosion-resistant zinc yellow-chromate plating. Complies with international metric standards and industrial safety requirements for heavy-duty fastening applications.