S-90389A213 1/4"-28 Flange Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction, ideal for marine, chemical, and outdoor applications.
• Enhanced load distribution and vibration resistance with a 5/8" flange, reducing the risk of loosening and surface damage to assembled materials.
• Precise and reliable fine threading with 1/4"-28 UNF and Class 2B fit, ensuring smooth engagement and a secure, leak-resistant connection.
• Easy installation and removal using standard wrenches due to the external hex drive and standard hex nut profile, saving time on the assembly line.
• Long-term durability and stability from the right-hand thread and robust 0.09" flange thickness, maintaining integrity under stress.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global supply chains.
• Wide industrial compatibility with UNF fine thread standards, making it a versatile choice for machinery, automotive, and structural assemblies.

Professional Applications & Engineering Value

This 316 stainless steel flange nut is engineered to address common industrial challenges like corrosion, vibration loosening, and assembly inefficiency. The UNF fine thread and Class 2B thread fit provide a tight, precise seal that minimizes fluid leakage and withstands dynamic loads in automotive, marine, and chemical processing equipment. The integrated flange acts as a built-in washer, distributing clamp force evenly to prevent damage to soft materials and reduce the need for additional components. Made from corrosion-resistant 316 stainless steel, it excels in saline or acidic environments, extending service life and reducing maintenance costs. The external hex drive ensures quick installation with common tools, streamlining production and repair workflows for engineers and maintenance teams.

Specification Summary & Compliance

This flange nut adheres to UNF fine thread standards with a size of 1/4"-28 and Class 2B thread fit for consistent, reliable performance. Key dimensions include a 5/8" flange diameter, 1/2" width, and 5/16" height, ensuring compatibility with standard assemblies. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmentally safe and regulated industrial use.