S-90272A539 1/4"-20 x 5/8" ASME B18.6.3 Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for long-lasting performance in harsh industrial environments
• Exceptional holding power with 60,000 psi tensile strength and Rockwell B70 hardness for reliable fastening in demanding applications
• Optimized installation efficiency through Phillips drive design and coarse UNC threading for faster assembly and reduced cross-threading risks
• Consistent dimensional accuracy with Class 2A thread fit ensuring precise engagement and uniform clamping force distribution
• Comprehensive regulatory compliance meeting ASME B18.6.3 specifications plus RoHS 3 and REACH environmental standards
• Versatile pan head design providing a larger bearing surface for secure fastening across various material thicknesses
• Full threading coverage along the entire 5/8" length for maximum grip strength and adjustment flexibility

Professional Applications & Engineering Value

These zinc-plated steel pan head screws deliver critical engineering advantages for industrial assembly operations. The combination of UNC coarse threading and Class 2A thread fit significantly reduces installation time while preventing cross-threading in high-volume production environments. The fully threaded design ensures maximum engagement depth across varying material thicknesses, eliminating the need for multiple screw types in mixed-assembly applications. The zinc plating provides essential corrosion protection for equipment exposed to moisture or chemical agents, while the pan head configuration offers superior clamp load distribution compared to standard flat heads. These Phillips drive screws are particularly valuable in electrical enclosures, machinery guards, and automotive components where vibration resistance and environmental durability are paramount.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances for precision engagement. Features UNC coarse threading (1/4"-20) with full threading along the 5/8" length. Compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. Mechanical properties include 60,000 psi tensile strength and Rockwell B70 hardness rating.