The TE Connectivity 1058117-1 is a between-series RF adapter that converts a BNC jack to an SMA jack in a single straight body. It is a panel-mount bulkhead adapter — the BNC side uses a bayonet lock, the SMA side uses threaded coupling — so it lets you transition between two common RF interface standards without a separate adapter cable.
No direct replacement is listed, so any requirement for this specific adapter must be filled through surplus or broker channels.
The bulk pack includes the connector body, a lockwasher, and a mounting nut.