The 1734100-4 is a vertical, through-hole plug connector designed for board-to-board connections. This 40-position Series I connector features a 1.27 mm centerline and is designed for through-hole mounting. It includes PCB mount retention via boardlocks and a keying post for secure and accurate polarization. The housing is constructed from black Liquid Crystal Polymer (LCP) with a UL 94V-0 flammability rating, and the phosphor bronze contacts are plated with Gold (30) in the mating area. This connector is suitable for VAFC (VESA Advanced Feature Connector) applications and is designed for use with PCB thicknesses ranging from 0.80 mm to 1.60 mm.