4-5353184-0 is a 140-position board-to-board plug connector from the Free Height family, designed for vertical PCB mounting applications. It features a 0.60 mm centerline pitch, dual-row configuration with in-line contact layout, and a board-to-board stack height of 4.00 mm. The connector includes gold-plated mating contacts (30 microinches), tin-plated solder tails, copper alloy contact base material, and integrated grounding plate with grounding contacts. It is keyed, preloaded, and equipped with locating posts for secure alignment. This RoHS/ELV compliant connector supports lead-free reflow soldering up to 260°C and is rated UL 94V-0 for flammability, making it suitable for personal systems, computers, and networking communications applications.