S-91099A476 12-24 x 1 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Optimized flush mounting through undercut flat head design with 82° countersink angle for seamless surface integration
• Enhanced driving efficiency with Phillips No. 3 drive system, reducing cam-out risks during installation
• Precision thread engagement with Class 2A fit and coarse UNC threading for faster assembly and vibration resistance
• Full-threaded design maximizing grip length and distribution of clamping force across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These 12-24 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure in manufacturing equipment, marine hardware, and food processing machinery. The undercut flat head profile with 82° countersink angle ensures precise seating in tapered recesses, eliminating protrusion issues while maintaining structural integrity. Combined with coarse UNC threading and Class 2A thread fit, these fasteners enable rapid installation in soft materials and maintain secure connections under dynamic loads. The fully threaded design and Phillips No. 3 drive further enhance assembly efficiency in high-volume production environments where reliability and speed are essential.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent mating with standard nuts and tapped holes. The 12-24 UNC coarse thread configuration ensures optimal performance in most industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe usage across global markets. Mechanical properties include 80,000 psi tensile strength and Rockwell B80 hardness for dependable performance in demanding fastening applications.