S-90585A831 5/8"-11 x 1 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh marine and chemical environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications
• Precision threading performance featuring Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Optimal flush mounting with standard 82° countersink angle flat head design for smooth surface finishes
• Easy installation and removal with 3/8" hex drive providing reliable torque transmission and reduced tool slippage
• Full thread coverage along the entire 1-1/2" length for maximum grip strength and load distribution
• Regulatory compliance assurance meeting ASME B18.3 standards with RoHS 3 and REACH environmental directives

Professional Applications & Engineering Value

This 316 stainless steel flat head screw delivers critical performance advantages in corrosive and high-stress environments. The combination of UNC coarse threading and Class 3A thread fit ensures rapid installation while maintaining vibration resistance in machinery, structural assemblies, and marine equipment. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making it suitable for chemical processing, offshore platforms, and food processing facilities where moisture and aggressive media are present. With full threading along its 1-1/2" length, it provides maximum engagement strength in both thin and thick materials, while the 82° flat head profile creates seamless flush mounting for safety and aesthetic requirements in finished products.

Specification Summary & Compliance

This fastener maintains precise dimensional tolerances with Class 3A thread fit per UNC standards and head diameter tolerance of -0.076" to 0". Manufacturing complies with ASME B18.3 specifications for flat head screws, ensuring consistent quality and interchangeability. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for hazardous substances. Material certification confirms 316 stainless steel composition with 70,000 psi tensile strength and Rockwell B55 hardness for verified mechanical performance.