The 105-2210-201 is a vertical test jack with insulated formed contact designed for reliable electrical testing and measurement applications. It features a beryllium copper contact per QQ-C-533 with gold or silver finish, housed in a nylon 6/6 body per ASTM D4066, and is rated for 5 amps continuous current with a minimum breakdown voltage of 3500 Vrms. The contact resistance is specified at 0.005 ohms maximum for gold plating and 0.010 ohms maximum for silver plating, with an adjacent jack capacitance of 1 pF maximum at 1 MHz. The jack incorporates a spring-loaded lead to hold securely in the board, contact protection from flux and solder, and UL-approved nylon for self-extinguishing properties. This design is ideal for test fixtures, measurement equipment, and laboratory applications where reliable electrical connections and low contact resistance are essential.