S-90585A665 5/16"-18 x 5" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 316 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precision thread engagement with Class 3A fit and UNC coarse spacing ensuring secure fastening in demanding applications
• Full-length threading provides maximum grip and holding power across the entire 5" screw length
• Optimized drive efficiency with hex drive design and 3/16" drive size for secure tool engagement and torque transmission
• Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability
• Environmental regulation compliance with RoHS 3 and REACH standards for safe use in regulated industries

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 316 stainless steel flat head screws deliver exceptional performance where corrosion resistance and mechanical reliability are critical. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures these fasteners withstand vibration, shock loads, and continuous stress in machinery, structural assemblies, and marine equipment. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these fully threaded screws ideal for chemical processing, offshore operations, and food processing facilities. The Class 3A thread fit with UNC coarse spacing provides rapid installation and secure fastening in both soft and hard materials, while the flat head design with standard profile ensures flush mounting for streamlined assemblies.

Specification Summary & Compliance

These 5/16"-18 UNC flat head screws feature precision Class 3A thread fit with coarse spacing and are manufactured to ASME B18.3 specifications where applicable. The 5" length with full threading maintains dimensional accuracy throughout, while the 0.656" head diameter with standard 82° countersink angle ensures proper seating. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and restricted substance adherence for global industrial use.