S-99291A490 9/16"-18 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
- Superior vibration resistance through distorted thread locking technology, preventing loosening under dynamic loads
- Enhanced corrosion protection with black-oxide steel finish, extending service life in demanding environments
- High-strength performance meeting ASTM Grade C requirements, ensuring reliable fastening under stress
- Precise thread engagement with Class 2B fit and UNF fine threads, providing secure, leak-resistant connections
- Easy installation and removal using standard external hex drive, compatible with common wrench tools
- Top-lock distorted thread design for immediate locking action without requiring additional components
- Regulatory compliance with REACH and RoHS 3 standards, suitable for regulated industrial applications
Professional Applications & Engineering Value
This 9/16"-18 UNF locknut with distorted thread technology addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and heavy equipment. The black-oxide steel construction provides essential corrosion resistance while maintaining ASTM Grade C strength for high-stress applications. The fine UNF thread profile ensures superior sealing capabilities and precise adjustment in systems requiring minimal clearance. Engineered for external hex drive compatibility, this top-lock nut delivers immediate securing action without secondary locking elements, reducing installation time and maintenance costs in production environments where vibration resistance and reliability are paramount.
Specification Summary & Compliance
This locknut features 9/16"-18 UNF fine threads with Class 2B thread fit for precision engagement, manufactured to ASTM Grade C strength standards. The distorted thread locking mechanism provides consistent vibration resistance while maintaining 7/8" hex width and 31/64" height dimensions. Compliant with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) regulations, ensuring environmental and safety standards are met for industrial applications worldwide.
