S-90909A216 1/2"-13 x 2" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction and passivated finish
• High mechanical strength and durability with 70,000 PSI tensile strength and Rockwell B70 hardness for demanding applications
• Eliminates the need for separate washers with its integrated flange, speeding up assembly and reducing component count
• Secure and reliable fastening ensured by the precise Class 3A thread fit and fully threaded UNC coarse thread design
• Easy installation with standard tools via the 5/16" hex drive, providing a positive grip and reducing the risk of stripping
• Compliant with major environmental regulations including RoHS 3 and REACH, ensuring safety and regulatory acceptance
• Versatile rounded button head profile offers a low-profile, finished appearance while the wide flange distributes load effectively

Professional Applications & Engineering Value

This 316 stainless steel flanged button head screw is engineered to solve critical challenges in industrial and marine settings where corrosion resistance is paramount. The combination of a passivated finish and the inherent properties of 316 stainless steel provides exceptional protection against chlorides and acidic environments, significantly extending service life. The integrated flange eliminates the common problem of misaligned or lost washers, streamlining assembly in high-vibration machinery, structural frameworks, and processing equipment. Its Class 3A UNC coarse thread ensures a secure, precise fit, reducing the risk of cross-threading during installation. The 5/16" hex drive allows for high-torque installation, making it a reliable heavy-duty fastener for applications demanding both mechanical strength and long-term environmental durability.

Specification Summary & Compliance

This screw adheres to the UNC (Unified Coarse) thread standard with a precise Class 3A thread fit for superior engagement. Key dimensional specifications include a 1/2"-13 thread size, 2" length, and a 1.156" flange diameter. The manufacturing and material compliance includes conformity with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring the product is free from hazardous substances and suitable for use in regulated markets.