S-91772A903 3-56 x 7/16" 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 long-term reliability in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Precise Class 2A thread fit provides consistent engagement and reduces cross-threading risks during assembly
• Optimized drive performance with Phillips No. 1 drive design for efficient installation and reduced cam-out
• Full threading along 7/16" length maximizes grip strength and load distribution across the entire fastener
• Comprehensive compliance with ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
• Fine UNF threading delivers superior vibration resistance and sealing capabilities compared to coarse threads

Professional Applications & Engineering Value

This 3-56 UNF pan head Phillips screw delivers critical engineering advantages for 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 it ideal for electronics enclosures, precision instruments, and marine components. The fine UNF threading and Class 2A thread fit ensure precise mating with tapped holes, reducing the risk of stripping in soft materials while maintaining consistent clamping force. The combination of 70,000 psi tensile strength and fully threaded design creates a fastener that withstands vibration and thermal cycling in demanding assemblies, while the Phillips No. 1 drive enables efficient installation in confined spaces common in electronic and mechanical systems.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 specifications with precision Class 2A thread fit tolerances for consistent performance. The 3-56 UNF fine thread configuration maintains dimensional accuracy throughout the 7/16" fully threaded length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The passivated surface treatment on 18-8 stainless steel provides enhanced corrosion protection while maintaining the material's inherent 70,000 psi tensile strength and Rockwell B70 hardness characteristics.