S-90675A005 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 washers that maintain clamping force in high-shock environments
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding industrial conditions
- Secure installation and removal using standard external hex drive compatible with common wrenching tools
- Reliable thread engagement with Class 2B thread fit ensuring consistent performance across mating components
- Optimized for coarse thread applications with 4-40 UNC threads providing excellent assembly efficiency
- Compact design solution with 1/4" width and 7/64" height for space-constrained assemblies
- Environmental compliance assurance meeting RoHS 3 and REACH standards for global manufacturing requirements
Professional Applications & Engineering Value
These 4-40 UNC locknuts with integrated external-tooth lock washers provide critical vibration resistance in industrial machinery, automotive assemblies, and electronic enclosures where loosening under dynamic loads poses significant reliability risks. The zinc-plated steel construction delivers essential corrosion protection while maintaining the mechanical strength required for demanding applications. The coarse UNC threads enable rapid installation and disassembly, reducing maintenance downtime in production environments. The external hex drive design ensures compatibility with standard tools, facilitating efficient assembly processes while the locking mechanism maintains consistent clamp load without requiring additional fastening components.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2B thread fit for reliable engagement with mating components. Features 4-40 UNC coarse threads with right-hand direction and standard hex profile measuring 1/4" across flats and 7/64" in height. The integrated external-tooth lock washer (0.281" OD) provides permanent locking capability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for use in global industrial applications.
