S-91772A079 2-56 x 3/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments and washdown applications.
• Superior mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high-stress conditions.
• Optimized for efficient assembly featuring a No. 1 Phillips drive and pan head design for secure tool engagement and reduced cam-out.
• Precision thread fit with Class 2A UNC coarse threads ensuring consistent, vibration-resistant connections in a wide range of materials.
• Full-threaded design provides maximum grip and clamping force across the entire 3/8" length for enhanced joint integrity.
• Broad regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for use in regulated and international markets.
• Versatile rounded pan head profile offers a low-profile, finished appearance while minimizing surface snagging.

Professional Applications & Engineering Value

This 2-56 UNC pan head machine screw is engineered to solve critical fastening challenges in industrial and electronic assemblies. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, making it suitable for applications in manufacturing equipment, marine hardware, and food processing machinery where durability is paramount. The combination of a coarse thread and Class 2A thread fit ensures rapid installation and reliable performance in softer materials or pre-tapped holes, reducing the risk of cross-threading. The Phillips drive and rounded pan head design facilitate quick, secure driving with standard tools, streamlining production lines and maintenance procedures. Its fully threaded shank maximizes thread engagement, providing superior resistance to loosening under dynamic loads and vibration, a common pain point in machinery and automotive sub-assemblies.

Specification Summary & Compliance

This screw maintains precise Class 2A thread fit tolerances per the UNC (Unified Coarse Thread) standard. Manufacturing and dimensional specifications conform to ASME B18.6.3. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted hazardous substances and suitable for global supply chains.