S-92210A408 3-48 x 5/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and long-term reliability.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications.
• Precise, reliable fastening ensured by Class 3A thread fit and UNC coarse threading, reducing the risk of cross-threading and assembly errors.
• Optimal flush mounting with a standard flat head profile and 82° countersink angle for a smooth, secure finish in countersunk holes.
• Efficient installation and removal using the 1/16" hex drive, providing a secure grip and reducing tool slippage.
• Full-length threading for maximum grip and load distribution along the entire 5/8" length, enhancing joint integrity.
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

These 3-48 UNC flat head screws are engineered to address critical challenges in precision assembly and harsh operating conditions. The 18-8 Stainless Steel construction, combined with a passivated finish, provides excellent resistance to corrosion and oxidation, making them ideal for applications in marine, chemical processing, and outdoor equipment. The Class 3A thread fit and coarse UNC threading ensure tight, reliable fastening with minimal risk of loosening under vibration, commonly encountered in machinery, automotive, and aerospace components. The 82° countersink angle and flat head design allow for seamless integration into surfaces, preventing protrusions and improving aerodynamic or aesthetic profiles. With a hex drive for secure tool engagement, these screws reduce installation time and enhance worker safety in high-volume production environments, delivering consistent performance and durability.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It adheres to ASME B18.3 specifications for flat head screw geometry and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting sustainable manufacturing practices.