S-90519A235 1/2"-20 Hex Nuts

Key Features & Benefits at a Glance

• Left-hand thread design provides secure fastening in applications requiring reverse rotation, preventing accidental loosening
• Grade 2 steel construction offers excellent strength-to-weight ratio for reliable performance in general industrial applications
• UNF fine threading (1/2"-20) delivers superior vibration resistance and better torque control compared to coarse threads
• Class 2B thread fit ensures smooth assembly and consistent engagement with mating components
• Standard external hex profile enables easy installation with common wrenches and sockets
• RoHS 3 and REACH compliance guarantees environmental safety and regulatory adherence for global applications
• Precise dimensions (3/4" width, 7/16" height) provide consistent fit and reliable performance in assembly operations

Professional Applications & Engineering Value

This left-hand thread hex nut solves critical engineering challenges in applications where standard right-hand threads would loosen under counter-clockwise rotation. The Grade 2 steel construction provides optimal strength for general industrial use while maintaining cost-effectiveness. The UNF fine threading with Class 2B fit ensures precise engagement in machinery, equipment, and assemblies requiring reverse-thread security. Commonly specified for rotating shaft applications, conveyor systems, and specialized machinery, this external hex nut delivers reliable performance where standard fasteners would fail. The combination of left-hand threading and fine thread spacing provides enhanced vibration resistance in demanding industrial environments.

Specification Summary & Compliance

This hex nut features 1/2"-20 UNF left-hand fine threading with Class 2B thread fit per unified thread standards. The dimensional specifications include 3/4" width across flats and 7/16" height, manufactured to standard inch system requirements. The fastener meets Grade 2 strength classification and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for various industrial applications while maintaining regulatory compliance.