S-90389A218 1/2"-20 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Integrated flange design eliminates the need for a separate washer, distributing load evenly and preventing surface damage
• Reliable, vibration-resistant fastening ensured by the fine UNF thread profile and Class 2B thread fit for secure connections
• Easy installation and removal with a standard external hex drive and 7/8" width for common wrenching tools
• Enhanced durability and longevity from the robust 1-1/8" flange diameter and 0.16" thickness, built for heavy-duty applications
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring safety and environmental responsibility
• Right-hand thread direction provides standard, intuitive installation for efficient assembly line operations

Professional Applications & Engineering Value

This 316 stainless steel flange nut is engineered to solve critical challenges in demanding sectors like chemical processing, marine, and food & beverage industries, where corrosion resistance is paramount. The 1/2"-20 UNF fine thread and Class 2B thread fit deliver a precise, secure connection that resists loosening under vibration, a common failure point in machinery and structural assemblies. The integral flange acts as a built-in washer, increasing the bearing surface area to protect softer materials from damage and reduce the risk of joint failure. This design streamlines inventory and assembly by combining two components into one, saving time and labor costs in industrial fastening applications requiring high reliability and long-term performance.

Specification Summary & Compliance

This flange nut adheres to UNF (Unified National Fine) thread standards with a Class 2B thread fit, ensuring consistent dimensional accuracy and interchangeability. Key specifications include a 1/2"-20 thread size, 1-1/8" flange diameter, 7/8" width across flats, and 11/16" height. The product is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances and safe for use in regulated markets.