S-90273A628 3/8"-16 x 1 1/2" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding industrial environments
• Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable performance under heavy loads
• Precise thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and reduced cross-threading risks
• Optimal flush mounting featuring standard 82° countersink angle for smooth surface finishes in wood and metal applications
• Enhanced installation efficiency with Phillips No. 4 drive providing secure tool engagement and reduced cam-out
• Full-thread design maximizing grip length and load distribution across the entire fastener length
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws deliver critical engineering solutions where flush surface requirements meet demanding mechanical performance needs. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, machinery assembly, and structural applications exposed to moderate environmental conditions. The coarse UNC thread profile ensures rapid installation and superior resistance to vibration loosening, while the 82° countersink angle creates seamless transitions in metal fabrication and woodworking projects. With full threading along the 1½" length, these fasteners maximize contact area for enhanced load distribution, making them ideal for applications requiring consistent clamping force across joined materials. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in high-stress assemblies without compromising installation efficiency.

Specification Summary & Compliance

These industrial-grade flat head screws maintain precise Class 2A thread fit tolerances according to UNC standards, ensuring consistent performance across manufacturing applications. Manufacturing compliance includes ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental regulatory adherence covers RoHS 3 (2015/863/EU) compliance for restricted substance management and REACH (EC 1907/2006) compliance for chemical safety standards. The right-hand thread direction with coarse thread spacing provides optimal engagement characteristics for industrial fastening requirements.