The 104078-2 is a vertical thru-hole receptacle connector designed for System 50 double-row board-to-board interconnections in computer industry applications. It features 40 contact positions spaced on 0.050 x 0.100 inch (1.27 x 2.54 mm) centers, providing high-density connectivity. The housing is constructed from thermoplastic material rated 94V-0, with contacts made from beryllium copper plated with gold on the mating end and bright tin-lead on the termination end, ensuring reliable electrical performance and durability. Standoffs are integrated for ease of cleaning and assembly. This connector is ideal for personal computer systems and other applications requiring robust, high-density board-to-board connections with vertical mounting orientation.