The TE Connectivity 5555167-4 is an 8p8c (RJ45, Ethernet) modular jack, a right-angle through-hole component designed for Cat3-rated unshielded twisted-pair applications. It sits in the 5555167 base product series and carries a board lock and keying feature for secure, polarized mating in panel-mount or PCB-edge installations. The gold-plated phosphor bronze contacts — plated to 50.0µin (1.27µm) — give it a solid mating-cycle life for field-service connections in telecom or industrial Ethernet gear that doesn't require shielding.
The tab faces down, so the latch on a standard RJ45 plug clicks into the jack from the board side.