S-91500A365 5/16"-18 x 3" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated finish
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable, heavy-duty performance
• Optimized fastening efficiency with fully threaded UNC coarse pattern providing superior holding power and quick installation
• Precise, reliable fit ensured by Class 2A thread fit and standard 82° countersink angle for flush mounting
• Broad industrial compatibility with Phillips No. 4 drive for common tooling and right-hand thread direction
• Regulatory peace of mind with compliance to ASME B18.6.3, RoHS 3, and REACH standards
• Dimensional consistency with 3" length, 0.597" head diameter, and standardized flat head profile for uniform application

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel flat head screws deliver critical corrosion resistance where exposure to chemicals, moisture, or salt spray would compromise ordinary fasteners. The combination of 70,000 psi tensile strength and fully threaded UNC coarse pattern ensures maximum clamping force and vibration resistance in machinery, marine equipment, and chemical processing applications. The passivated finish creates an additional protective layer, while the standard 82° countersink allows for flush mounting in precision assemblies. These Phillips drive screws provide reliable performance in maintenance operations and OEM equipment where ASME B18.6.3 compliance is required for quality assurance.

Specification Summary & Compliance

This 5/16"-18 x 3" flat head screw features Class 2A thread fit per UNC standards with right-hand threading and coarse spacing. Manufacturing specifications conform to ASME B18.6.3 for dimensional accuracy and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial distribution and use.