S-91771A076 2-56 x 3/16" 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 mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness to withstand high-stress applications
• Reliable thread engagement through Class 2A thread fit and UNC coarse threading for secure fastening and vibration resistance
• Efficient installation with Phillips No. 1 drive design providing positive torque transfer and reduced cam-out risk
• Optimal flush mounting featuring standard flat head profile with 82° countersink angle for seamless surface integration
• Full-threaded design ensuring maximum grip length and uniform load distribution across the entire fastener
• Regulatory compliance meeting ASME B18.6.3 standards and environmental regulations for global industrial acceptance

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical performance advantages in precision assembly applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides excellent protection against oxidation and chemical exposure, making them ideal for electronics enclosures, medical devices, marine equipment, and food processing machinery. The combination of Class 2A thread fit and coarse UNC threading ensures rapid installation with minimal cross-threading risk, while the fully threaded design maintains consistent clamping force across the entire engagement length. The 82° countersink angle and standard flat head profile create flush surface finishes essential for aerodynamic components, precision instruments, and assemblies requiring smooth exterior surfaces.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance and UNC coarse thread specifications. These flat head screws comply with ASME B18.6.3 mechanical and dimensional requirements, ensuring interchangeability and performance consistency. Environmental compliance includes RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety. The 3/16" length and right-hand threading provide standardized installation across industrial applications requiring reliable 18-8 stainless steel fasteners.