S-91099A222 6-32 x 5/8" 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 installation featuring an undercut flat head with 82° countersink angle for seamless surface finishing
• Secure fastening engagement through UNC coarse threading with Class 2A fit, ensuring vibration resistance and easy assembly
• Efficient installation and removal with Phillips No. 2 drive design, compatible with standard industrial tools
• Full regulatory compliance meeting ASME B18.6.3 specifications, RoHS 3, and REACH for global supply chain compatibility
• Complete thread coverage with fully threaded 5/8" length for maximum grip strength across the entire fastener

Professional Applications & Engineering Value

These flat head Phillips machine screws deliver critical performance advantages in precision assembly applications where surface flushness and material integrity are paramount. The passivated 18-8 stainless steel construction provides excellent resistance to oxidation and chemical exposure, making them ideal for industrial equipment, electronic enclosures, and marine components. The undercut flat head profile ensures countersunk seating without material protrusion, while the UNC coarse threading with Class 2A fit maintains secure fastening under vibration and thermal cycling. The combination of 80,000 psi tensile strength and standardized Phillips No. 2 drive enables reliable installation in automated production environments, reducing assembly time and improving manufacturing efficiency.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit and UNC coarse threading (6-32 size) ensuring interchangeability and proper engagement. The 5/8" length features full threading with precise 82° countersink angle for optimal flush mounting. Compliance includes ASME B18.6.3 mechanical and dimensional specifications, RoHS 3 (2015/863/EU) for hazardous substance restriction, and REACH (EC 1907/2006) for chemical safety compliance in industrial applications.