S-91771A885 2-56 x 7/16" 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, ideal for harsh environments and long-term reliability.
• High tensile strength of 80,000 psi ensures secure fastening and resistance to mechanical stress in demanding applications.
• Rockwell B80 hardness provides excellent durability and wear resistance, reducing the risk of stripping or damage during installation.
• Precise Class 2A thread fit with UNC coarse threading for easy alignment and reliable engagement in various materials.
• 82° countersink angle with undercut flat head allows for a flush, low-profile finish that minimizes protrusion and improves aesthetics.
• Phillips drive (No. 1 size) offers convenient and efficient installation with standard tools, enhancing assembly speed.
• Compliance with ASME B18.6.3, RoHS, and REACH ensures adherence to industry standards and environmental safety for global supply chains.

Professional Applications & Engineering Value

These 2-56 UNC flat head screws are engineered to address common industrial challenges, such as vibration loosening and corrosion in machinery, electronics, and automotive assemblies. The passivated 18-8 stainless steel material provides a protective layer that significantly enhances corrosion resistance, making them suitable for humid or chemically aggressive environments. The fully threaded design and coarse UNC threading ensure quick, secure fastening in metals and plastics, reducing installation time while maintaining high tensile strength. The undercut flat head profile and 82° countersink angle enable a seamless fit, preventing snagging and improving safety in compact spaces. Ideal for precision equipment and regulatory-compliant projects, these screws deliver consistent performance and longevity.

Specification Summary & Compliance

This product features a 2-56 UNC coarse thread with Class 2A fit for standard dimensional accuracy and ease of assembly. It is manufactured in accordance with ASME B18.6.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for industrial use.