S-92210A107 4-40 x 5/16" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for high-stress applications without failure.
• Precise, secure fastening with Class 3A thread fit and UNC coarse threads, reducing cross-threading and ensuring consistent engagement.
• Efficient installation and flush seating thanks to the hex drive and 82° countersink angle, minimizing protrusion and speeding assembly.
• Full threading for maximum grip along the entire 5/16" length, providing uniform clamping force across the joint.
• Compliance with rigorous standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
• Right-hand thread design for standard installation, compatible with common tools and procedures.

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to address critical challenges in industrial settings where vibration, moisture, and high loads are common. The 18-8 stainless steel material combined with a passivated finish significantly enhances corrosion resistance, making them ideal for machinery, electronic enclosures, and outdoor equipment. The hex drive and flat head design with an 82° countersink angle allow for flush mounting, reducing aerodynamic drag and improving aesthetics in assembled products. With a coarse thread spacing and Class 3A fit, these screws ensure quick, reliable fastening in metals and plastics, minimizing assembly time and preventing loosening under dynamic conditions. Fully threaded for uniform stress distribution, they provide dependable performance in industrial fasteners applications requiring high strength and durability.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including Class 3A thread fit and UNC thread standards, ensuring compatibility and performance. Manufactured in accordance with ASME B18.3 specifications, it meets rigorous engineering requirements. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industries without hazardous substances.