S-90389A221 5/8"-18 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction
• Enhanced load distribution and joint stability with the integrated 1-3/8" flange, eliminating the need for a separate washer
• Secure, vibration-resistant fine thread engagement provided by the 5/8"-18 UNF Class 2B thread fit
• Reliable and straightforward installation with the standard external hex drive profile for common tooling
• Long-term durability and performance in demanding applications due to high-grade material and precision manufacturing
• Compliance with major environmental regulations, including RoHS 3 and REACH, ensuring safer use in regulated industries

Professional Applications & Engineering Value

This 316 Stainless Steel Flange Nut is engineered to solve critical fastening challenges in corrosive and high-stress environments. The UNF fine thread and Class 2B thread fit provide a tighter, more secure connection that is less prone to loosening under vibration, making it ideal for machinery, marine equipment, and chemical processing applications. The large 1-3/8" flange diameter distributes clamping force over a wider area, protecting soft materials and reducing the risk of surface damage. Manufactured from 316 stainless steel, it offers exceptional resistance to chemicals, saltwater, and extreme temperatures, delivering reliable performance and reducing maintenance frequency in industrial fastening systems.

Specification Summary & Compliance

This flange nut conforms to UNF (Unified National Fine) thread standards with a Class 2B thread fit for consistent, precise engagement. Key dimensions include a 5/8"-18 thread size, 1-3/8" flange diameter, and 13/16" height. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.