S-92210A078 2-56 x 5/16" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening under stress
• Precise thread engagement ensured by Class 3A thread fit and UNC coarse threading, reducing cross-threading risks
• Efficient installation and removal with hex drive design (0.050" drive size) providing secure tool grip
• Flush mounting capability with standard 82° countersink angle and flat head design for smooth surface finishes
• Full threading along the 5/16" length offers maximum grip and uniform load distribution
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety

Professional Applications & Engineering Value

This 2-56 UNC flat head screw in 18-8 stainless steel is engineered to address critical fastening challenges in demanding sectors such as machinery assembly, electronics enclosures, and automotive components. The passivated finish significantly enhances corrosion resistance, preventing degradation in humid or chemically aggressive settings. Its coarse UNC threading and Class 3A thread fit ensure quick, secure installation with minimal risk of stripping, while the hex drive allows for high torque application without slippage. The fully threaded design and 82° countersink enable flush mounting, making it ideal for applications where aerodynamics, safety, and aesthetics are paramount. By combining high tensile strength with rigorous compliance, this screw delivers reliability in industrial applications requiring durable, precision fasteners.

Specification Summary & Compliance

This screw adheres to ASME B18.3 specifications, with precise Class 3A thread fit and UNC coarse threading (2-56 size) for consistent performance. Dimensions include a length of 5/16", head diameter of 0.197", and drive size of 0.050". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.