S-99291A370 1/2"-13 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted thread top lock design that maintains secure fastening under dynamic loads
• Enhanced corrosion protection with black-oxide steel finish for extended service life in industrial environments
• Reliable strength performance meeting ASTM Grade C specifications for heavy-duty applications
• Easy installation and removal with standard external hex drive compatible with common wrench tools
• Precise thread engagement with Class 2B thread fit ensuring consistent performance across mating components
• Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
• Universal compatibility with 1/2"-13 UNC coarse thread fasteners commonly used in industrial equipment

Professional Applications & Engineering Value

This heavy-duty lock nut addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and construction equipment. The distorted thread top lock technology creates consistent interference that resists rotational forces without requiring additional locking components. Manufactured from black-oxide steel, the nut provides essential corrosion resistance while maintaining the structural integrity required for ASTM Grade C applications. The standard hex profile and external hex drive design ensure compatibility with standard tooling, reducing installation time and eliminating the need for specialized equipment. The UNC coarse thread configuration offers rapid assembly in high-volume production environments while the Class 2B thread fit guarantees reliable engagement with mating bolts.

Specification Summary & Compliance

This 1/2"-13 UNC lock nut features Class 2B thread fit tolerances per industry standards, ensuring precise dimensional accuracy across production batches. The manufacturing process adheres to ASTM Grade C strength requirements for consistent mechanical performance. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming the absence of restricted substances. The distorted thread locking mechanism maintains functionality across temperature variations and loading conditions, providing reliable performance in demanding industrial applications.