S-91771A977 6-32 x 1/4" 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 for long-term reliability in harsh environments
• Exceptional mechanical strength with 80,000 PSI tensile strength and Rockwell B80 hardness for demanding applications
• Precision thread engagement with Class 2A thread fit ensuring consistent, reliable fastening performance
• Optimized flush mounting featuring 100° countersink angle and undercut flat head design for seamless surface integration
• Enhanced driving efficiency with No. 2 Phillips drive providing secure tool engagement and reduced cam-out risk
• Full-thread coverage along the 1/4" length for maximum grip and load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global applications

Professional Applications & Engineering Value

These 6-32 UNC flat head Phillips screws deliver critical performance advantages for industrial assembly applications where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these fasteners ideal for electronics enclosures, marine equipment, food processing machinery, and outdoor installations. The combination of 80,000 PSI tensile strength and Rockwell B80 hardness ensures reliable performance under vibration and thermal cycling conditions. The undercut flat head profile with 100° countersink angle allows for flush mounting in precision-machined components, while the coarse thread spacing and Class 2A thread fit provide quick installation and secure fastening in various materials including metals, plastics, and composites.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance and UNC coarse thread spacing per ASME specifications. These fully threaded fasteners feature right-hand threading direction and are produced in compliance with ASME B18.6.3 mechanical and dimensional requirements. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring suitability for restricted substance-sensitive applications across global markets.