S-99291A420 7/8"-9 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 top thread design that maintains clamp force under extreme dynamic loads.
- Enhanced Durability with black-oxide steel construction providing corrosion resistance in industrial environments.
- High-Strength Performance meeting ASTM Grade C specifications for demanding mechanical applications.
- Reliable Thread Engagement with Class 2B thread fit ensuring consistent installation and reusability.
- Quick Installation using standard wrenches on the external hex drive style for efficient assembly.
- Coarse Thread Advantage with UNC 7/8"-9 profile enabling faster installation and better debris clearance.
- Regulatory Compliance with RoHS 3 and REACH standards for global industrial supply chain integration.
Professional Applications & Engineering Value
This heavy-duty locknut addresses critical vibration-induced loosening challenges in industrial machinery, construction equipment, and transportation systems. The distorted thread top lock mechanism creates permanent friction resistance without requiring additional locking components, simplifying assembly while maintaining ASTM Grade C strength rating. The black-oxide steel surface treatment provides essential corrosion protection in harsh operating environments, while the coarse UNC threads ensure reliable performance in applications where fine debris accumulation might compromise thread integrity. Engineered for right-hand threaded assemblies requiring repeated disassembly and reassembly, this solution combines vibration resistance with maintenance-friendly design.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2B thread fit tolerance for consistent engagement. Complies with UNC thread standards (7/8"-9 coarse thread) and ASTM Grade C mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements. Physical dimensions include 1 5/16" width across flats and 3/4" height for standard wrench compatibility.
