S-90166A133 3/8"-16 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, ideal for harsh industrial environments and reducing maintenance costs.
• High tensile strength of 70,000 psi ensures reliable fastening under heavy loads, minimizing the risk of mechanical failure.
• Integrated flange design eliminates the need for a separate washer, providing a larger bearing surface for improved load distribution and faster assembly.
• Coarse UNC threads offer quick and easy installation, even in materials where fine threads might strip or cross-thread.
• External hex drive with a standard hex head allows for high-torque tightening using common tools, ensuring a secure and tight fit.
• Partial threading provides an unthreaded shank for precise clamping on specific joint designs, enhancing joint integrity.
• Full compliance with ASTM F593, RoHS 3, and REACH guarantees material quality, environmental safety, and suitability for regulated industries.

Professional Applications & Engineering Value

This 3/8"-16 UNC hex head screw is engineered to solve critical challenges in demanding applications. The 18-8 Stainless Steel material provides excellent resistance to oxidation and corrosion, making it a durable choice for outdoor machinery, marine equipment, and chemical processing plants where exposure to moisture and corrosive agents is a constant concern. The flanged head design is particularly valuable in assembly lines, as it speeds up installation by removing the washer-handling step and prevents the screw head from sinking into softer materials. With its coarse thread and Class 2A thread fit, it ensures robust engagement in metals and plastics, reducing the likelihood of vibration-induced loosening. This combination of high tensile strength and corrosion resistance delivers long-term reliability, minimizing downtime and replacement frequency in structural frameworks, heavy equipment manufacturing, and transportation infrastructure.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in compliance with the ASTM F593 specification (where applicable per IFI 111) for stainless steel bolts, hex cap screws, and studs. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for hazardous substances.