S-90040A030 5/16"-18 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through center lock distorted thread design that maintains secure fastening under dynamic loads
• Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding environments
• Reliable thread engagement with Class 2B UNC coarse threads ensuring consistent performance and easy installation
• Industry-standard compatibility with 5/16"-18 right-hand threads for broad application across industrial equipment
• Optimized torque transmission via external hex drive design allowing for secure installation with standard tools
• Grade 2 strength certification providing dependable mechanical performance for general industrial applications
• Environmental compliance assurance meeting both REACH and RoHS 3 standards for responsible manufacturing

Professional Applications & Engineering Value

This zinc-plated steel locknut with distorted thread technology addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and structural applications. The center lock design creates controlled thread distortion that generates consistent prevailing torque, maintaining clamp force where standard nuts would fail. The UNC coarse thread profile combined with Class 2B tolerance ensures rapid assembly without compromising thread integrity. The external hex drive facilitates installation in confined spaces while the zinc plating provides sacrificial corrosion protection, making this Grade 2 locknut ideal for applications requiring reliable long-term performance under cyclic loading conditions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2B thread fit and UNC 5/16"-18 coarse thread specifications. The locknut features a standard hex profile measuring 1/2" across flats with 17/64" height. Full compliance with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) environmental directives, ensuring adherence to international substance restriction requirements. The Grade 2 strength classification confirms consistent mechanical properties for industrial fastening applications requiring dependable performance.