S-90640A133 1/2"-13 Locknuts

Key Features & Benefits at a Glance

• Superior vibration resistance through nylon insert locking that prevents loosening under dynamic loads
• High-temperature performance with nylon insert maintaining integrity up to 220°F (104°C)
• Enhanced corrosion protection from zinc-plated steel construction for extended service life
• Easy installation and removal with standard external hex drive design
• Reliable thread engagement with UNC coarse threads and Class 2B fit for consistent performance
• Right-hand threading for standard industrial applications and compatibility
• Environmental compliance meeting RoHS 3 and REACH standards for global manufacturing

Professional Applications & Engineering Value

This 1/2"-13 nylon insert lock nut delivers exceptional vibration resistance in demanding industrial environments where secure fastening is critical. The zinc-plated steel construction provides durable corrosion protection, while the nylon insert maintains locking performance even at elevated temperatures up to 220°F. Engineered with UNC coarse threads and Class 2B fit, this external hex locknut ensures reliable performance in machinery, automotive assemblies, and structural applications where vibration-induced loosening can compromise safety and operational integrity. The combination of material strength and precision manufacturing makes this fastener ideal for heavy-duty industrial applications requiring long-term reliability.

Specification Summary & Compliance

This locknut features 1/2"-13 UNC coarse threads with Class 2B thread fit for precise engagement, measuring 3/4" width and 19/32" height. Manufactured to industry standards with external hex drive and right-hand threading. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring certified components.