S-91099A266 8-32 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, ensuring long-term reliability in harsh environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for demanding industrial applications
• Precise flush mounting enabled by the 82° countersink angle and undercut flat head design for seamless surface integration
• Optimized drive efficiency through Phillips No. 2 drive style, providing secure torque transfer and reduced cam-out risk
• Reliable thread engagement with fully threaded UNC coarse threads and Class 2A fit for consistent fastening performance
• Broad regulatory compliance meeting ASME B18.6.3 specifications, RoHS 3, and REACH environmental standards
• Versatile right-hand threading compatible with standard 8-32 UNC components across various industrial assemblies

Professional Applications & Engineering Value

These 8-32 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction prevents galvanic corrosion in chemical processing, marine, and food-grade environments, while the undercut flat head profile ensures complete seating without surface protrusion in precision machinery and electronic enclosures. The fully threaded coarse design provides maximum grip length in sheet metal, plastic assemblies, and structural frameworks, with the Phillips No. 2 drive enabling efficient installation in high-volume production lines. Engineers specify these screws for applications requiring consistent Class 2A thread fit and compliance with ASME B18.6.3 dimensional standards.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 dimensional specifications with Class 2A thread fit tolerance for consistent mating with standard UNC nuts and threaded holes. The 8-32 UNC coarse thread pattern ensures rapid assembly while maintaining 80,000 psi tensile strength across the full 5/8" length. Full compliance with RoHS 3 (2015/863/EU) hazardous substance restrictions and REACH (EC 1907/2006) chemical registration requirements confirms environmental responsibility. The 82° countersink angle conforms to industry-standard chamfered seating surfaces.