S-91771A084 2-56 x 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments.
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-term fastening.
• Optimized for flush mounting with a standard flat head and 82° countersink angle, providing a smooth, secure finish.
• Efficient installation and removal facilitated by the No. 1 Phillips drive, reducing tool slippage and assembly time.
• Consistent and reliable thread engagement with UNC coarse threading and Class 2A fit, ensuring precise alignment and vibration resistance.
• Full threading along the 3/4" length for maximum grip and adjustability in a wide range of material thicknesses.
• Compliance with major industry standards including ASME B18.6.3, guaranteeing dimensional accuracy and performance reliability.

Professional Applications & Engineering Value

These 2-56 UNC flat head screws are engineered to address common challenges in precision assembly and corrosive environments. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, making them suitable for electronics, automotive, and marine applications where durability is critical. The flat head with an 82° countersink ensures a seamless fit, preventing snagging and maintaining aerodynamic or aesthetic surfaces. With a coarse UNC thread and Class 2A fit, these screws offer quick installation and robust holding power, reducing the risk of stripping in softer materials. The Phillips drive allows for efficient torque application, enhancing productivity in high-volume manufacturing settings while the fully threaded design ensures uniform stress distribution.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications for dimensional consistency and performance. The thread fit is Class 2A, providing standard manufacturing tolerances for reliable assembly. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance control. The product meets all specified mechanical properties, including tensile strength and hardness, as defined by the standards.