S-91858A591 5/16"-18 x 2" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments and chemical exposure
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable performance under heavy loads
• Optimized thread engagement through UNC coarse threading and Class 2A fit, ensuring secure fastening and reduced cross-threading risks
• Flush mounting capability with standard 82° countersink angle and flat head design for smooth surface finishes
• Full-length threading provides maximum grip along the entire 2" length, enhancing load distribution in demanding applications
• Broad compliance coverage meeting ASME B18.6.3 specifications and environmental regulations including RoHS 3 and REACH
• Simplified installation with slotted drive design for straightforward manual or automated assembly processes

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel flat head screws deliver exceptional performance where corrosion resistance is critical. The passivated finish creates an enhanced protective oxide layer, significantly extending service life in marine, chemical processing, and food industry applications. The combination of UNC coarse threading and Class 2A thread fit ensures rapid installation with minimal galling while maintaining precise tolerances. The fully threaded design maximizes clamping force distribution across the entire fastener length, making these flat head screws ideal for machinery assembly, structural frameworks, and equipment requiring flush-mounted fasteners. The 82° countersink angle provides seamless integration with standard chamfered holes, creating clean, professional installations.

Specification Summary & Compliance

This 5/16"-18 UNC flat head screw features precise Class 2A thread fit tolerances per UNC standards with coarse thread spacing for optimal performance. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance compliance for global industrial applications.