S-90273A445 1/2"-13 x 1" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for reliable performance in demanding industrial environments
• Superior holding power with 60,000 psi tensile strength and Rockwell B70 hardness for secure fastening in high-stress applications
• Optimized flush installation featuring standard 82° countersink angle and flat head design for smooth surface finishing
• Efficient coarse threading with UNC 1/2"-13 threads and Class 2A fit for quick assembly and reduced cross-threading risks
• Convenient drive system using No. 4 Phillips style for common tool compatibility and straightforward installation
• Full thread coverage across the 1" length ensures maximum engagement and uniform load distribution
• Regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality assurance and environmental safety

Professional Applications & Engineering Value

Engineered for industrial applications requiring reliable fastening solutions, these zinc-plated steel flat head screws deliver exceptional performance where corrosion resistance and structural integrity are paramount. The 1/2"-13 UNC coarse threading provides rapid installation in metal, wood, and composite materials, while the Class 2A thread fit ensures consistent engagement without compromising assembly speed. The 82° countersink angle and flat head profile create seamless surface transitions in machinery, equipment manufacturing, and structural assemblies. With fully threaded design and Phillips drive system, these screws offer uniform clamping force and tool compatibility across maintenance, fabrication, and production environments where vibration resistance and long-term durability are critical operational requirements.

Specification Summary & Compliance

This flat head Phillips screw maintains precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and performance standards. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations regarding chemical safety, ensuring environmental responsibility and workplace safety compliance.