S-91099A475 12-24 x 1 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with passivated 18-8 stainless steel construction for reliable performance in harsh industrial environments
• Superior holding power with 80,000 PSI tensile strength and Rockwell B80 hardness for demanding applications
• Precision thread engagement through Class 2A thread fit and UNC coarse threading for secure fastening and vibration resistance
• Optimized flush mounting with undercut flat head profile and 82° countersink angle for seamless surface integration
• Efficient installation with Phillips No. 3 drive design for quick, secure tool engagement and reduced assembly time
• Full-thread coverage across the entire 1-1/4" length for maximum grip strength and load distribution
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

These 12-24 UNC flat head screws deliver critical engineering solutions for industrial applications requiring reliable fastening under stress. The passivated 18-8 stainless steel construction provides exceptional corrosion resistance, making them ideal for machinery, electrical enclosures, and outdoor equipment where environmental exposure is a concern. The undercut flat head profile with 82° countersink angle ensures flush mounting without protrusion, preventing snagging while maintaining structural integrity. With fully threaded coarse UNC patterning and Class 2A fit, these screws offer superior vibration resistance and load distribution in metal-to-metal and composite material assemblies. The combination of 80,000 PSI tensile strength and Phillips No. 3 drive facilitates efficient installation in high-volume production environments while maintaining consistent performance standards.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse threading (12-24) ensuring consistent engagement and interchangeability. The 1-1/4" length features full threading with standardized 82° countersink angle for proper seating. These screws conform to ASME B18.6.3 mechanical specifications and demonstrate compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring verified material safety and performance standards.