S-90166A122 5/16"-18 x 1" 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 outdoor applications
• Exceptional mechanical strength with 70,000 psi tensile rating and Rockwell B80 hardness for reliable performance under heavy loads
• Integrated flange design eliminates the need for separate washers, providing wider bearing surface and faster installation
• Precision Class 2A thread fit ensures smooth assembly and consistent clamping force in UNC coarse thread applications
• External hex drive compatibility allows for high-torque installation using standard tools without stripping concerns
• Full threading along the 1" length provides maximum grip and adjustment flexibility in various material thicknesses
• Regulatory compliance assurance meets ASTM F593 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This flanged hex head screw delivers critical engineering advantages in demanding industrial applications. The 18-8 stainless steel composition provides excellent resistance to corrosion and oxidation, making it ideal for marine equipment, food processing machinery, and outdoor structures exposed to weather elements. The integrated flange design distributes clamping force over a wider area (11/16" diameter), preventing surface damage and maintaining joint integrity in sheet metal assemblies, electrical enclosures, and automotive components. The 5/16"-18 UNC coarse threading with Class 2A fit ensures rapid installation in both soft and hard materials while maintaining vibration resistance. With 70,000 psi tensile strength and full threading, this fastener provides reliable performance in high-stress applications where failure is not an option.

Specification Summary & Compliance

This 5/16"-18 UNC flanged hex head screw features precise Class 2A thread fit with coarse thread spacing, manufactured to ASTM F593 standards (IFI 111). The inch-dimensioned fastener measures 1" in length with 1/2" head width and 21/64" head height. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and restricted substance adherence for global manufacturing applications.