What is the optical connector?

Question

Cables and wires

Good day, comrades! Help, please identify the connector. The thread diameter is about 5.5mm, the head part is 3.1mm. The cable was installed in the machine, but, unfortunately, it failed (a crack in one connector. I'm attaching a photo.
Thank you.

Answer 1

FC connector, single mode

Answer 2

It seems like a standard optical connector, of course your pictures are on top, it's nice when people can spend three minutes to take a picture of a normally necessary detail.
In any office that deals with equipment for telecoms, you can probably buy one, but now they are all plastic in my opinion.
Well, any telecom office can weld you a small bucks for a hundred or two hundred.

Answer 3

Most likely it is an SMA connector for plastic fiber.