S-90909A641 1/4"-20 x 1 1/4" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments and extended service life
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high-stress loads
• Precision thread engagement with Class 3A fit and UNC coarse threading ensures secure, vibration-resistant connections and easier assembly
• Integrated flange design eliminates the need for a separate washer, providing a larger bearing surface and faster installation
• Convenient hex drive (5/32") allows for high-torque installation with standard tools, reducing slippage and tool wear
• Fully threaded shank maximizes grip length and adjustability, offering versatile fastening solutions across various material thicknesses
• Environmental compliance meets RoHS 3 and REACH standards, ensuring safety and regulatory adherence for global industrial applications

Professional Applications & Engineering Value

This 316 stainless steel flanged button head screw is engineered to address critical challenges in demanding industrial settings. Its corrosion-resistant properties, enhanced by the passivated finish, make it ideal for applications in chemical processing, marine environments, and food equipment where moisture and corrosive agents are prevalent. The UNC coarse thread and Class 3A thread fit provide superior holding power and reduce the risk of cross-threading, ensuring reliable performance in high-vibration machinery and structural assemblies. The integrated flange distributes clamping force evenly, preventing surface damage and simplifying inventory by replacing washer-and-screw combinations. With a hex drive for secure tool engagement, this fully threaded fastener delivers consistent, repeatable results in automated or manual assembly lines, enhancing productivity and reducing maintenance downtime.

Specification Summary & Compliance

This fastener adheres to UNC thread standards with a Class 3A thread fit for precise, high-strength engagement. Key dimensional specifications include a 1/4"-20 thread size, 1 1/4" length, and 0.563" flange diameter. Manufacturing consistency is ensured through full threading and a rounded button head profile. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, guaranteeing the absence of restricted hazardous substances for safe use in various industrial sectors.