S-91772A081 2-56 x 1/2" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ensuring longevity in harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high-stress applications
• Optimized drive engagement with No. 1 Phillips drive and pan head design for secure installation and reduced cam-out risk
• Precise thread compatibility through Class 2A UNC coarse threads providing consistent fit and vibration resistance in assemblies
• Full-threaded design delivering maximum grip length and uniform load distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 manufacturing standards and environmental regulations (RoHS 3, REACH)
• Right-hand threading for standard installation procedures and compatibility with common assembly equipment

Professional Applications & Engineering Value

These 2-56 UNC pan head Phillips screws deliver critical performance advantages for precision assemblies requiring corrosion-resistant fastening solutions. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these rounded head screws ideal for electronics enclosures, medical devices, marine equipment, and food processing machinery where environmental durability is paramount. The combination of coarse UNC threading with Class 2A fit ensures rapid installation and secure fastening in materials where fine threads might strip or fail. The fully threaded design maximizes surface contact area, distributing mechanical loads evenly to prevent joint failure in vibration-prone applications. With their No. 1 Phillips drive and standardized pan head profile, these screws enable efficient assembly operations while maintaining consistent torque transmission.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 2A thread fit tolerance for consistent assembly performance. Complies with ASME B18.6.3 mechanical and dimensional specifications for machine screws. Thread configuration follows UNC coarse thread standards with right-hand direction. Meets environmental compliance requirements including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for restricted substance control.