S-99291A330 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
- Superior vibration resistance through precision distorted top lock threads that maintain clamp force under dynamic loads
- Enhanced durability and corrosion protection with black-oxide steel construction for extended service life in harsh environments
- Reliable performance under stress with ASTM Grade C strength classification ensuring consistent mechanical properties
- Easy installation and removal with standard external hex drive design compatible with common wrench tools
- Precise thread engagement with Class 2B thread fit providing optimal clearance for smooth assembly
- Wide industrial compatibility with 1/4"-20 UNC coarse thread pattern matching common equipment and components
- Environmental compliance assurance meeting RoHS 3 and REACH standards for responsible manufacturing
Professional Applications & Engineering Value
This black-oxide steel locknut addresses critical vibration-induced loosening challenges in industrial assemblies. The distorted thread top lock mechanism creates continuous interference along the mating threads, generating consistent friction that counters rotational forces in high-vibration environments. The UNC coarse thread profile ensures rapid installation while maintaining holding power, particularly valuable in production lines where assembly efficiency matters. The external hex drive accommodates standard torque tools, enabling precise installation control. Engineered for machinery, automotive, and heavy equipment applications, this ASTM Grade C compliant fastener delivers reliable performance where vibration resistance directly impacts operational safety and maintenance intervals.
Specification Summary & Compliance
This locknut features 1/4"-20 UNC coarse threads with Class 2B thread fit for standard clearance applications. Manufacturing complies with ASTM Grade C specifications for mechanical properties. Dimensions include 7/16" width across flats and 7/32" height for standard profile requirements. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental responsibility in industrial supply chains.
