S-90519A245 5/8"-18 Hex Nuts

Key Features & Benefits at a Glance

• Left-hand threading provides secure fastening in applications requiring reverse rotation resistance, preventing unintentional loosening under counter-clockwise motion.
• Grade 2 steel construction offers excellent durability and reliable strength for general industrial use, balancing performance with cost-effectiveness.
• Class 2B thread fit ensures smooth assembly and consistent engagement with mating components, reducing installation time and risk of cross-threading.
• Fine UNF thread spacing delivers superior vibration resistance and improved clamping force distribution in precision assemblies.
• Standard external hex drive enables easy installation and removal with common wrenches, facilitating maintenance and reducing tooling requirements.
• Full regulatory compliance with RoHS 3 and REACH standards guarantees safe usage in regulated industries and international markets.
• Precision inch dimensions (15/16" width, 35/64" height) ensure perfect compatibility with standard industrial components and replacement parts.

Professional Applications & Engineering Value

This left-hand thread hex nut solves critical engineering challenges in applications where standard right-hand threads would loosen under reverse rotational forces. The Grade 2 steel construction provides optimal strength-to-weight ratio for machinery, conveyor systems, and rotating equipment where vibration resistance is paramount. The fine UNF threading and Class 2B fit maintain precise torque retention in high-cycle applications, while the standard external hex drive profile ensures compatibility with existing tooling inventories. Particularly valuable in maintenance scenarios where directional thread requirements prevent accidental disassembly, this nut delivers reliable performance in automotive, manufacturing, and heavy equipment applications where reverse-threaded components are essential for operational safety.

Specification Summary & Compliance

Manufactured to precise inch standard dimensions with 15/16" width and 35/64" height. Features 5/8"-18 UNF left-hand fine threads with Class 2B thread fit tolerance for consistent mating performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and chemical substance restrictions adherence. Manufactured from Grade 2 steel meeting standard industrial strength requirements for reliable fastener performance.