Grainger supplies phone connector and data connector options for your communication networks. One of the most important parts of a voice and data network is the RJ45 connector. Sometimes used as a phone jack, an RJ45 connector is attached to the end of a phone cord or data cable. It connects computers and phones to the hub. If you are installing or upgrading your phone system, find parts to bring your project together. Grainger features standard RJ45 connectors for flat Cat5 wire, jacks fitting Hubble keystone openings, and phone cord couplers and adapters.