S-91500A353 8-32 x 5/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
• Optimized flush mounting featuring an 82° countersink angle and standard flat head profile for seamless surface integration
• Enhanced drive stability with Phillips No. 2 drive design reducing cam-out risks during high-torque installation
• Long-term environmental durability due to passivated surface treatment preventing galvanic corrosion and oxidation
• Full regulatory compliance meeting ASME B18.6.3 specifications and international RoHS 3/REACH standards

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 8-32 UNC flat head screws deliver critical performance advantages in corrosive or high-stress environments. The 316 stainless steel composition provides exceptional pitting resistance, making these Phillips drive screws ideal for chemical processing equipment, marine hardware, and food-grade machinery where material integrity is paramount. The fully threaded design with coarse spacing ensures maximum grip strength in soft materials or thin sheet metal assemblies, while the passivated finish creates an additional protective barrier against chloride-induced stress corrosion cracking. With standardized 82° countersink geometry, these fasteners enable flush mounting in precision-machined components, eliminating protrusion issues in confined spaces and automated assembly systems.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications, these screws maintain Class 2A thread fit tolerances for consistent mating with UNC threaded components. The 8-32 thread size with 5/16" length provides standardized dimensional compatibility across industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material traceability. The mechanical properties—including 70,000 psi tensile strength and Rockwell B80 hardness—are verified to meet industrial fastener requirements for structural applications.