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Three-way Bayonet Locking Connector
Bayonet Locking Connector; a connector using some number of locking posts or slots so that the two ends of the connectors will mate and lock together with a twisting motion. Also called Bayonet coupling or quick-coupling connector. There are many different families of connectors that are baynet locking, BNC being the most common. The common style BNC connector will have two locking posts; however three locking posts are vary common with military connectors.
The BNC connector has an outer conductor [normally ground] and an inner conductor which normally carries the signal. A BNC connector is used with a Coax Cable [Manufacturers]. The SMA Connector is a similar style connector, but smaller. A competing style to the bayonet connector is the crimp-on style, which would also work with coax cable.
Refer here for Coax Connector Manufacturers
