S-90166A117 1/4"-20 x 1 3/4" 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 dependable performance under heavy loads and vibration.
• Integrated flange design eliminates the need for a separate washer, providing a larger bearing surface and simplifying installation.
• External hex drive and hex head allow for high-torque application and easy installation with standard tools.
• Coarse UNC thread and Class 2A fit enable quick assembly and reliable engagement in a wide range of materials.
• Partial threading offers an unthreaded shank for precise clamping and increased shear strength.
• Full compliance with ASTM F593, RoHS 3, and REACH guarantees material quality and environmental safety for regulated industries.

Professional Applications & Engineering Value

This 1/4"-20 UNC hex head flange screw is engineered to solve critical fastening challenges in demanding industrial settings. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for outdoor equipment, marine applications, and chemical processing plants where environmental factors degrade ordinary fasteners. The flanged head distributes clamping force over a wider area, reducing surface pressure and preventing loosening under dynamic loads. Combined with a coarse UNC thread and partial threading, it ensures secure fastening in softer materials or when vibration resistance is paramount. Its external hex drive facilitates high-torque installation, making it a reliable choice for machinery assembly, structural frameworks, and automotive components that require durable, long-lasting connections.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured from 18-8 Stainless Steel with a hardness of Rockwell B80 and a tensile strength of 70,000 psi. The product complies with ASTM F593 for material and mechanical properties, and is verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for industrial use.