S-90389A211 4-40 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments like marine or chemical processing.
• Enhanced load distribution from the 3/8" flange diameter, reducing surface pressure and preventing material damage.
• Reliable thread engagement with Class 2B fit and coarse UNC threading, ensuring easy assembly and vibration resistance.
• Quick and secure installation using the standard external hex drive, compatible with common wrenches for efficient maintenance.
• Long-term operational integrity in right-hand threaded applications, maintaining clamp force under dynamic loads.
• Compliance with global standards including RoHS 3 and REACH, making it suitable for regulated industrial and export markets.
• Durable performance from the 0.05" flange thickness, providing stability and reusability in frequent disassembly scenarios.

Professional Applications & Engineering Value

This 4-40 UNC flange nut in 316 stainless steel addresses critical challenges in industrial settings where corrosion and vibration are prevalent. The flange design eliminates the need for separate washers, speeding up assembly in tight spaces like electrical enclosures, machinery frames, and automotive components. Its coarse thread and Class 2B thread fit reduce cross-threading risks, while the external hex drive allows for high-torque application with standard tools. Engineered for demanding applications, it ensures reliable fastening in corrosive environments, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This nut adheres to UNC coarse thread standards with a Class 2B thread fit for consistent dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances. Manufactured to inch system measurements, it features a 3/8" flange diameter and 0.05" flange thickness for reliable performance in industrial assemblies.