S-91771A550 1/4"-20 x 2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional tensile strength of 80,000 PSI ensures reliable performance under high-stress applications
• Precise Class 2A thread fit with UNC coarse spacing for faster installation and reduced cross-threading risks
• Optimized Phillips No. 3 drive provides secure tool engagement and efficient torque transfer
• Standard 82° countersink angle allows for flush mounting in various materials and clean finished appearances
• Full threading along the 2" length delivers maximum grip and uniform load distribution
• Compliance with major regulations including RoHS 3 and REACH for safe, environmentally conscious usage

Professional Applications & Engineering Value

These flat head Phillips machine screws are engineered to address common industrial fastening challenges, including vibration loosening and corrosion-induced failure. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, making them suitable for machinery, automotive assemblies, and outdoor equipment. The UNC coarse threads and Class 2A fit ensure quick, secure installation in both metal and plastic substrates, reducing assembly time while maintaining joint integrity. With a Rockwell B80 hardness and full threading, these screws offer consistent performance in high-vibration environments, preventing premature wear and maintenance downtime.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A tolerance for precise fit, manufactured in accordance with ASME B18.6.3 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial and commercial applications.