S-91771A978 6-32 x 3/8" 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 and outdoor applications
• Exceptional mechanical strength delivering 80,000 PSI tensile strength and Rockwell B80 hardness for reliable performance under heavy loads
• Optimized flush mounting with undercut flat head design and 100° countersink angle for seamless surface integration and reduced snagging
• Quick installation and secure fastening through UNC coarse threading and Class 2A thread fit, ensuring consistent engagement and vibration resistance
• Broad compatibility with standard #2 Phillips drive tools, simplifying assembly and reducing tooling costs
• Full regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe, quality-assured industrial use
• Complete thread coverage along the 3/8" length for maximum grip strength and uniform stress distribution in assemblies

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these flat head Phillips machine screws provide critical solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction effectively combats oxidation and chemical exposure in manufacturing, marine, and electronics sectors. The undercut flat head profile and 100° countersink angle prevent protrusion in precision assemblies, while the UNC coarse threading ensures rapid installation and reliable hold in metals and plastics. With full compliance to ASME B18.6.3 standards, these screws deliver consistent performance in automated production lines and structural frameworks, reducing maintenance cycles and enhancing operational safety.

Specification Summary & Compliance

This machine screw adheres to precise dimensional tolerances with Class 2A thread fit and UNC coarse thread specifications. Manufacturing follows ASME B18.6.3 for dimensional consistency and mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. Key attributes include a 0.262" head diameter, 3/8" length, and full threading for uniform load distribution across connected components.