5-104477-4 is a single-row, right-angle unshrouded thru-hole header connector part of the AMPMODU Interconnection System, designed for board-to-board connections with 0.050 x 0.100 inch [1.27 x 2.54 mm] centerline spacing. This 40-position connector features a post length of 0.145 inches [3.68 mm] and is constructed with brass contacts duplex plated with gold on the contact area and tin on solder posts, with nickel underplating for enhanced durability and solderability. The connector housing is made of black thermoplastic rated UL 94V-0, ensuring flame resistance and reliability in demanding applications. This header is commonly used in high-density interconnect applications, test equipment, and industrial control systems where space efficiency and reliable board-to-board signal transmission are essential.