S-91771A648 3/8"-16 x 6" 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 for extended service life in harsh environments
• Exceptional tensile strength rated at 80,000 psi for reliable performance in demanding industrial applications
• Precise flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Optimized drive efficiency through Phillips No. 4 drive system ensuring secure installation and reduced cam-out
• Reliable thread engagement with UNC coarse threading and Class 2A fit for quick assembly and vibration resistance
• Partial threading design providing enhanced clamping force control across the 1½" minimum threaded section
• Consistent hardness performance at Rockwell B80 ensuring dimensional stability under load

Professional Applications & Engineering Value

These 3/8"-16 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for marine equipment, food processing machinery, and outdoor structural applications. The partially threaded design with coarse UNC threading ensures rapid assembly while maintaining superior clamping force in materials where full threading isn't required. The Phillips No. 4 drive offers familiar, efficient installation with reduced tool slippage, and the standardized 82° countersink angle guarantees proper seating in prepared holes. These industrial-grade flat head screws solve common fastening challenges where protruding fastener heads would interfere with mechanical operation or present safety hazards.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse thread profile ensuring consistent performance. Complies with ASME B18.6.3 specifications for mechanical properties and dimensional requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance for restricted substance management. The 6" length with 1½" minimum thread length provides optimal unthreaded shank for applications requiring precise clamping control.