S-90585A653 8-32 x 2 1/2" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Optimal flush mounting featuring standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation efficiency with hex drive (3/32") enabling high-torque application and reduced tool slippage
• Full-threaded design providing consistent holding power along the entire 2-1/2" length for maximum grip
• Regulatory compliance assurance meeting ASME B18.3 manufacturing standards and environmental regulations (RoHS 3, REACH)

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 8-32 UNC flat head screw addresses critical challenges in corrosive environments where standard fasteners fail. The 316 stainless steel composition combined with passivated finish creates a robust barrier against chemical exposure, saltwater, and extreme temperatures, making it ideal for marine equipment, chemical processing plants, and food processing machinery. The hex drive design ensures secure tool engagement during high-torque installations, while the Class 3A thread fit maintains precise tolerances for vibration-resistant connections in heavy machinery and structural assemblies. The fully threaded 2-1/2" length provides uniform stress distribution, preventing loosening under dynamic loads and reducing maintenance intervals in critical infrastructure projects.

Specification Summary & Compliance

This flat head screw maintains precision Class 3A thread fit with UNC coarse threads (8-32 size) and features a standard 82° countersink angle. Manufacturing complies with ASME B18.3 specifications where applicable per ASTM F879. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material transparency. Dimensional accuracy includes head diameter tolerance of -0.048" to 0" and full compliance with inch system measurement standards.