S-91500A550 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 316 stainless steel construction for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Enhanced chemical resistance through passivated surface treatment for improved durability against corrosive agents
• Precise thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized flush mounting featuring standard 82° countersink angle for seamless surface integration
• Efficient installation with No. 3 Phillips drive providing positive torque transfer and reduced cam-out
• Full-threaded design delivering maximum grip length and uniform stress distribution along the entire fastener

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver exceptional performance in demanding industrial environments where corrosion resistance is critical. The combination of marine-grade 316 stainless steel and passivated finish provides superior protection against saltwater, chemicals, and extreme weather conditions, making them ideal for marine equipment, chemical processing plants, and outdoor infrastructure. The fully threaded UNC coarse thread design ensures rapid installation and reliable holding power in various materials, while the standard 82° countersink angle allows for flush mounting in precision applications. These Phillips drive screws maintain structural integrity under continuous stress, offering engineers a dependable solution for permanent installations where disassembly is infrequent and long-term reliability is paramount.

Specification Summary & Compliance

This 1/4"-20 x 2" flat head screw features Class 2A thread fit tolerance for precise engagement and meets ASME B18.6.3 manufacturing specifications. The fastener is fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring safe use in regulated industries. Manufacturing adheres to inch system standards with UNC coarse threading and proper dimensional controls for consistent performance across production batches.