S-92210A861 5/16"-18 x 4 1/2" ASME B18.3, ASTM F879 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 industrial environments.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration.
• Precise Class 3A thread fit provides excellent engagement and reduces the risk of cross-threading.
• Easy installation and removal with hex drive design, minimizing tool slippage and damage.
• 82° countersink angle allows for a flush, professional finish in standard countersunk holes.
• Full threading along the 4 1/2" length offers maximum grip and adjustability in deep applications.
• Compliance with ASME B18.3 and ASTM F879 guarantees consistent quality and engineering reliability.

Professional Applications & Engineering Value

This 5/16"-18 UNC flat head screw is engineered to address common industrial challenges such as material fatigue and environmental degradation. Made from 18-8 stainless steel with a passivated finish, it resists oxidation and chemical exposure, making it suitable for outdoor machinery, marine equipment, and chemical processing plants. The coarse UNC thread and Class 3A fit ensure quick, secure fastening in metals and plastics, reducing assembly time while maintaining high tensile strength. The hex drive allows for high-torque installation without cam-out, and the flat head design with an 82° angle provides a smooth, flush surface, preventing snagging in moving parts. Ideal for heavy-duty applications like structural frameworks, conveyor systems, and automotive assemblies, this screw delivers long-term reliability and compliance with rigorous industry standards.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances and reliable performance. Dimensions include a length of 4 1/2", head diameter of 0.656", and full threading for consistent engagement. It meets ASME B18.3 and ASTM F879 specifications for dimensional accuracy and mechanical properties. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are adhered to.