S-91771A213 8-32 x 4" 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
• Enhanced installation precision featuring Phillips No. 2 drive and 82° countersink angle for secure, flush mounting
• Reliable mechanical performance with 80,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Optimized thread engagement through UNC coarse threading and Class 2A fit, ensuring consistent fastening
• Versatile partial threading design allowing flexibility in adjustment and secure clamping across various materials
• Industry-standard compliance meeting ASME B18.6.3 specifications for dimensional accuracy and reliability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe, sustainable usage

Professional Applications & Engineering Value

These 8-32 UNC flat head screws deliver exceptional engineering value in industrial settings where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction prevents oxidation in humid or chemically aggressive environments, while the partially threaded design with coarse UNC threading provides superior holding power in metal assemblies, machinery frames, and construction applications. The Phillips No. 2 drive combined with the standardized 82° countersink angle ensures rapid, precise installation without cam-out issues, reducing assembly time and improving workflow efficiency. With 80,000 psi tensile strength, these fasteners maintain clamp force under vibration and load variations, making them ideal for automotive components, electrical enclosures, and structural frameworks where long-term reliability is critical.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards, these screws maintain Class 2A thread fit tolerances for consistent engagement. The 4" length with 1 1/2" minimum thread length provides optimal unthreaded shank for alignment. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and regulatory acceptance across global markets.