S-91771A591 5/16"-18 x 2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional load-bearing capacity with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under stress
• Precise flush mounting thanks to the standard 82° countersink angle and flat head design for seamless surface integration
• Efficient installation and removal with Phillips No. 4 drive, reducing tool slippage and assembly time
• Consistent thread engagement through fully threaded UNC coarse threads and Class 2A fit, minimizing cross-threading risks
• Broad industrial compatibility with right-hand threading and 2" length, suitable for diverse assembly applications
• Regulatory peace of mind by meeting ASME B18.6.3, RoHS 3, and REACH standards for quality and safety compliance

Professional Applications & Engineering Value

This 5/16"-18 UNC flat head screw delivers robust performance in demanding settings like machinery assembly, structural frameworks, and outdoor equipment. Crafted from passivated 18-8 stainless steel, it combats rust and chemical exposure, extending service life in humid or corrosive conditions. The fully threaded coarse design ensures rapid installation and high vibration resistance, while the Phillips drive offers torque control for precision fastening. Engineers value its 82° countersink angle for creating smooth, flush surfaces, reducing snagging risks in automated systems. Ideal for industrial fasteners requiring durability and compliance, this screw addresses common failures like loosening and material degradation.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. Manufacturing follows ASME B18.6.3 specifications for consistent quality, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances. Key specs include a 2" length, coarse threading, and right-hand direction, backed by 80,000 psi tensile strength for reliable mechanical performance.