S-99291A110 1/4"-20 Locknuts
Locknuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Vibration-resistant locking through distorted thread top design prevents loosening under dynamic loads
- Enhanced corrosion protection with zinc yellow-chromate plating for extended service life in harsh environments
- Reliable strength performance meeting ASTM Grade C specifications for demanding industrial applications
- Easy installation and removal with standard external hex drive using common wrench tools
- Precise thread engagement with Class 2B fit ensuring consistent performance across mating components
- Optimized for coarse thread applications with 1/4"-20 UNC threads for rapid assembly in various materials
- Standard dimensional compatibility with 7/16" width and 7/32" height fitting conventional hardware systems
Professional Applications & Engineering Value
This 1/4"-20 UNC locknut delivers critical vibration resistance where conventional fasteners fail. The distorted thread top lock technology creates permanent friction against mating threads, eliminating the need for secondary locking devices in industrial machinery, automotive assemblies, and structural frameworks. Manufactured from zinc yellow-chromate-plated steel, it provides superior corrosion resistance compared to standard zinc plating, significantly reducing maintenance cycles in humid or chemical-exposed environments. The external hex drive enables high-torque installation with common tools while maintaining the ASTM Grade C strength rating for high-stress applications. Engineered with coarse UNC threads, it offers excellent engagement in soft materials and rapid installation across production lines.
Specification Summary & Compliance
This locknut features 1/4"-20 UNC coarse threads with Class 2B thread fit for precise dimensional accuracy and consistent performance. Manufactured to ASTM Grade C material and strength specifications, it ensures reliability in mechanical fastening applications. The product complies with industry standards for distorted thread locking nuts and meets RoHS and REACH environmental compliance requirements for industrial use.
