S-90166A119 1/4"-20 x 2 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 for long-lasting performance in harsh environments
• High tensile strength of 70,000 psi ensures reliable load-bearing capacity for demanding industrial applications
• Rockwell B80 hardness provides excellent durability and resistance to wear and deformation
• UNC coarse threading with Class 2A fit enables quick installation and secure fastening with standard tools
• Flanged hex head design eliminates the need for separate washers and distributes clamping force evenly
• Partial threading allows for precise clamping control and reduced risk of cross-threading
• Full regulatory compliance with ASTM F593, RoHS 3, and REACH standards ensures safety and environmental responsibility

Professional Applications & Engineering Value

These 18-8 stainless steel hex head screws deliver exceptional engineering value in industrial settings where corrosion resistance and mechanical strength are critical. The UNC coarse thread configuration combined with Class 2A thread fit provides reliable engagement in various materials while resisting vibration-induced loosening. The flanged design eliminates washer requirements, streamlining assembly processes in machinery, structural frameworks, and equipment manufacturing. With partial threading and external hex drive, these fasteners offer precise installation control for applications requiring specific clamp load distribution. The 70,000 psi tensile strength and Rockwell B80 hardness make them ideal for heavy-duty applications in chemical processing, marine environments, and food processing equipment where both mechanical performance and corrosion resistance are paramount.

Specification Summary & Compliance

This 1/4"-20 x 2-1/2" hex head screw features precise Class 2A thread fit tolerances and UNC coarse threading per industry standards. Manufacturing complies with ASTM F593 specifications (IFI 111) for consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide.