S-90273A060 2-56 x 5/16" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Exceptional holding power from 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening performance
• Optimized installation efficiency with Phillips No. 1 drive and fully threaded design for consistent engagement
• Precise flush mounting featuring standard flat head profile with 82° countersink angle for seamless surface finishes
• Reliable thread compatibility through Class 2A thread fit and UNC coarse threads ensuring vibration resistance
• Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards (RoHS 3/REACH)
• Versatile application readiness with right-hand thread direction suitable for various industrial assembly requirements

Professional Applications & Engineering Value

These zinc-plated steel flat head screws deliver critical performance advantages in precision assembly applications where surface flushness and corrosion resistance are paramount. The 2-56 UNC coarse thread configuration provides excellent engagement in softer materials while resisting vibration-induced loosening. The fully threaded design maximizes pull-out strength across the entire fastener length, addressing common failure points in dynamic load conditions. With 82° countersink angle and standard flat head profile, these screws create seamless finishes in metal fabrication, electronics enclosures, and machinery components. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in high-stress industrial environments while maintaining installation efficiency through the Phillips drive system.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerances and UNC coarse thread specifications. Complies with ASME B18.6.3 mechanical and dimensional requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for hazardous substance restrictions. Thread specifications include right-hand direction, 2-56 size, and standard pitch coarse threading for optimal performance in industrial applications.