S-96278A005 4-40 Locknuts
Locknuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
Washer Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through integrated external-tooth lock washer that maintains clamping force in high-motion environments
- Excellent corrosion protection with 18-8 stainless steel construction resisting rust and chemical degradation
- Reliable thread engagement with Class 2B thread fit ensuring consistent performance and easy assembly
- Enhanced durability from 400 series stainless steel washer providing hardened locking surface
- Industry-standard compatibility with UNC coarse threads matching common industrial equipment requirements
- Secure installation using standard 1/4" hex drive for convenient tooling and proper torque application
- Regulatory compliance meeting both REACH and RoHS 3 standards for safe industrial usage
Professional Applications & Engineering Value
This 4-40 UNC locknut with external-tooth lock washer addresses critical vibration-induced loosening in industrial machinery, automotive assemblies, and electrical enclosures. The 18-8 stainless steel construction provides exceptional corrosion resistance for harsh environments, while the 400 stainless steel washer creates permanent locking action without damaging mating surfaces. The coarse UNC thread profile ensures rapid installation and reliable performance in high-vibration applications where fine threads might fail. Engineered for Class 2B thread fit, this locknut maintains precise dimensional stability across temperature variations and repeated maintenance cycles, making it ideal for OEM manufacturing and MRO applications requiring dependable fastening solutions.
Specification Summary & Compliance
This heavy-duty locknut features 4-40 UNC coarse threads with Class 2B thread fit for consistent engagement and right-hand threading. The assembly combines a standard hex nut profile with 1/4" width and 1/8" height dimensions, paired with an external-tooth lock washer measuring 0.281" OD. Manufacturing complies with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental standards, ensuring safe usage across industrial applications while maintaining the corrosion-resistant properties of both 18-8 and 400 series stainless steel components.
