S-90166A111 1/4"-20 x 1/2" ASTM F593, IFI 111 Stainless Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
• High tensile strength of 70,000 psi ensures secure, durable fastening under heavy loads and vibration.
• Rockwell B80 hardness provides excellent wear resistance and maintains thread integrity during installation.
• Flanged head design eliminates the need for separate washers, distributing load evenly and speeding up assembly.
• UNC coarse threading with Class 2A fit offers quick, easy engagement and reliable performance in most industrial applications.
• External hex drive allows for high torque application with standard tools, reducing installation time and slippage risks.
• Full threading ensures consistent grip along the entire length, enhancing holding power in various materials.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 18-8 Stainless Steel hex head screws deliver exceptional performance in machinery, structural assemblies, and outdoor equipment. The UNC coarse thread and Class 2A fit provide reliable fastening in metals and plastics, reducing cross-threading risks and ensuring repeatable installations. The flanged design increases bearing surface, preventing surface damage and loosening under dynamic loads. With high tensile strength and corrosion resistance, they are ideal for applications exposed to moisture, chemicals, or stress, minimizing maintenance and replacement costs in heavy-duty fastening scenarios.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and UNC coarse threading with a 1/4"-20 thread size and 1/2" length. It meets ASTM F593 specifications for consistent quality and performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material sustainability in industrial use.