When you need to connect and RCA patch cord to a BNC cable, these adapters make it easy. Just snap one on and connect your cables.
All machined type connectors
Gold plated contact pins
Recommended for cable with solid center conductor
BNC Male to RCA Female Adapter (Single)
Review by Zach Thomas on Jul 29, 2013
Like the other review says it's good to have these in a pinch if you need them. I had some audio wires to hook up the other day and I needed to go from RCA incoming cable to a BNC connection. They worked fine!
This doesn't really apply to security systems but I thought you might be interested anyway. I run our Company's Technical Training Center that has a full electronic presentation system including LCD projectors, DVD players, a Digital Overhead machine, and lots more. Recently, we upgraded (replaced) the main unit and relocated it. There were tons of wires. These adaptors made adding the RCA patch cords to the original BNC connectors a breeze. Thanks.