S-91771A105 2-56 x 3/8" 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 mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement through UNC coarse threading and Class 2A fit ensures secure fastening and vibration resistance
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced driving efficiency with Phillips No. 1 drive style providing secure torque transfer and reduced cam-out risk
• Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Complete thread coverage with fully threaded 3/8" length for maximum grip strength across the entire fastener

Professional Applications & Engineering Value

These flat head Phillips screws deliver critical performance advantages in demanding industrial applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these fasteners ideal for machinery, electronic enclosures, and outdoor equipment. The combination of UNC coarse threading and Class 2A thread fit ensures rapid installation with consistent clamping force, while the 82° countersink angle creates a flush surface finish that eliminates protrusions in precision assemblies. With 80,000 psi tensile strength, these screws maintain structural integrity under significant stress, preventing fastener failure in vibration-intensive environments common in manufacturing and automotive applications.

Specification Summary & Compliance

This 2-56 x 3/8" flat head screw features precision UNC coarse threads with Class 2A thread fit tolerance for consistent engagement. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and performance reliability. The fastener meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) regulations for chemical safety. The passivated 18-8 stainless steel construction provides inherent corrosion resistance while maintaining the specified mechanical properties including Rockwell B80 hardness and 80,000 psi tensile strength.