S-90166A121 5/16"-18 x 3/4" 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 environments like marine or chemical processing.
• High tensile strength of 70,000 psi ensures reliable performance and joint integrity under significant load and stress.
• Built-in flange design eliminates the need for a separate washer, providing a larger bearing surface for secure, vibration-resistant fastening.
• Coarse UNC thread and Class 2A fit offer quick and easy installation with reliable thread engagement in a variety of materials.
• External hex drive and hex head allow for high-torque application with standard tools, speeding up assembly and disassembly.
• Full threading along the 3/4" length provides maximum grip and adjustability in the fastened joint.
• Compliance with major standards including ASTM F593, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 18-8 Stainless Steel Hex Head Flange Screw is engineered to solve critical fastening challenges in demanding sectors. Its corrosion-resistant material is vital for longevity in industrial, marine, and construction applications where exposure to moisture and chemicals is common. The integrated flange distributes clamping force effectively, preventing surface damage and loosening under vibration, a common failure point in machinery and structural assemblies. The coarse UNC thread ensures robust performance in softer materials or where rapid assembly is required, while the external hex drive facilitates high-torque installation with common tools. This combination of a durable stainless steel body, a flanged design, and high tensile strength delivers a reliable, long-lasting fastener that reduces maintenance needs and enhances the safety of the overall assembly.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with a Class 2A thread fit, ensuring standard-compliant dimensional accuracy and ease of assembly. It is manufactured to meet the material and mechanical property requirements of ASTM F593. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it is free of restricted hazardous substances and safe for use in regulated markets.