S-90585A552 1/4"-20 x 2 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 316 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance under heavy loads.
• Precise, secure fastening ensured by Class 3A thread fit and UNC coarse threading, reducing the risk of cross-threading and loosening.
• Efficient installation and removal with a 5/32" hex drive, providing a positive grip and minimizing tool slippage.
• Flush surface finish due to the standard flat head with 82° countersink angle, allowing for a smooth, unobtrusive installation.
• Full-length threading for maximum grip and holding power along the entire 2 1/2" length of the screw.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head screw is engineered from 316 stainless steel to solve critical challenges in demanding applications such as chemical processing, marine hardware, and food-grade equipment where corrosion from moisture, chemicals, and salts is a constant threat. The passivated finish enhances the material's natural resistance, significantly extending service life and reducing maintenance costs. Its hex drive design allows for high-torque installation, ensuring a secure fit even in hard-to-reach areas. The coarse UNC thread and Class 3A fit provide excellent engagement in a variety of materials, preventing vibration-induced loosening and ensuring joint integrity in industrial machinery and structural assemblies.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with a Class 3A precision fit for high-strength applications. Manufacturing and dimensional tolerances conform to ASME B18.3 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in regulated markets.