[Boatanchors] miniature bayonet connectors

[CLIVE COLLINS]

Greetings gentlemen and a happy holiday greeting to you all.
I have recovered from an American instrument, a number of what appear to be miniature BNC connectors that I want to use in a construction project. Can anyone tell me the correct designation of these please.? They are about half the size of a conventional BNC .  I will also need suitable coax to fit to them and I would be grateful for the identification of the correct cable number please and a suggestion where it might be obtained from . Thanks in advance

Clive GW3WEQ North Wales Coast UK