S-90273A289 12-24 x 3/8" 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 industrial environments
• Enhanced driving efficiency with Phillips No. 3 drive design, reducing installation time and tool slippage
• Reliable flush mounting thanks to the 82° countersink angle and undercut flat head profile for seamless surface integration
• Exceptional load-bearing capacity with 60,000 psi tensile strength and Rockwell B70 hardness for high-stress applications
• Precision thread engagement through Class 2A thread fit and UNC coarse threading, ensuring consistent fastening performance
• Full regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality assurance and environmental safety
• Optimized for rapid assembly with fully threaded 3/8" length and right-hand thread direction for efficient production workflows

Professional Applications & Engineering Value

These 12-24 UNC flat head screws deliver critical engineering solutions where surface-flush fastening and corrosion resistance are paramount. The zinc-plated steel construction provides essential protection against oxidation in manufacturing facilities, electrical enclosures, and outdoor equipment. The undercut flat head design with 82° countersink angle prevents surface protrusion while maximizing contact area, solving common issues of material splitting and insecure seating. With coarse UNC threading and full threading along the 3/8" length, these Phillips drive screws offer superior pull-out resistance in soft materials and faster installation in high-volume production environments. The combination of 60,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in vibration-prone applications, from machinery assembly to automotive components.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent engagement. Thread specifications include 12-24 UNC coarse thread with right-hand direction and 0.216" thread diameter. Fully compliant with ASME B18.6.3 mechanical specifications, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) regulations for chemical safety. The 82° countersink angle and undercut head profile meet industrial fastening requirements for flush surface mounting applications.