S-90166A124 5/16"-18 x 1 1/2" ASTM F593, IFI 111 Stainless Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
• High tensile strength of 70,000 psi ensures reliable performance under significant load and stress, reducing the risk of fastener failure.
• Coarse UNC threading and Class 2A thread fit provide faster installation and easier assembly, saving valuable time on the production line.
• Integrated flange design eliminates the need for a separate washer, distributing clamp load effectively and simplifying inventory management.
• External hex drive and hex head allow for high-torque application with standard tools, ensuring a secure and tight fit.
• Partial threading offers superior grip and clamping force on specific sections, enhancing joint stability in demanding applications.
• Compliance with ASTM F593, RoHS 3, and REACH guarantees material quality and environmental safety, meeting stringent industry and regulatory standards.

Professional Applications & Engineering Value

This 5/16"-18 UNC hex head screw is engineered to address common industrial challenges such as vibration loosening and material degradation. The 18-8 Stainless Steel provides excellent resistance to rust and corrosion, making it suitable for applications in chemical processing, marine hardware, and food machinery where exposure to moisture is a concern. The coarse thread and Class 2A thread fit ensure quick and reliable engagement, even in materials where fine threads might strip. The flanged design increases bearing surface area, reducing surface pressure and preventing damage to softer materials. With a Rockwell B80 hardness and 70,000 psi tensile strength, this partially threaded screw delivers robust performance in structural assemblies, heavy equipment, and automotive frameworks, providing long-term reliability and reducing maintenance cycles.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with a Class 2A thread fit for standard inch-system applications, ensuring dimensional accuracy and interchangeability. It is manufactured in compliance with ASTM F593 specifications for consistency and quality. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.