S-99291A140 7/16"-14 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through distorted top lock threads that maintain secure fastening under dynamic loads
• Enhanced corrosion protection with zinc yellow-chromate plating for extended service life in harsh environments
• High-strength performance meeting ASTM Grade C standards for reliable use in heavy-duty applications
• Easy installation and removal with standard external hex drive compatible with common tools
• Precise thread engagement with Class 2B fit ensuring consistent performance and reduced assembly issues
• Optimized for coarse threading (UNC 7/16"-14) providing faster installation and better resistance to loosening
• Compact dimensional profile (11/16" width × 3/8" height) enabling use in space-constrained assemblies

Professional Applications & Engineering Value

This 7/16"-14 UNC locknut delivers critical vibration resistance where conventional fasteners fail. The distorted top lock thread design creates permanent friction that prevents rotation under sustained vibration, making it ideal for heavy machinery, automotive assemblies, and industrial equipment. Manufactured from zinc yellow-chromate-plated steel, it provides superior corrosion resistance while maintaining the mechanical strength required for ASTM Grade C applications. The coarse thread spacing ensures rapid installation and superior holding power in materials where fine threads might strip, while the external hex drive accommodates standard wrenching tools for efficient maintenance operations.

Specification Summary & Compliance

This locknut features Class 2B thread fit per UNC standards with 7/16"-14 coarse threading and right-hand direction. Manufactured to ASTM Grade C specifications, it maintains dimensional accuracy with 11/16" width and 3/8" height. The product complies with industry standards for mechanical fasteners and meets RoHS and REACH environmental requirements.