Unlike all the other guesses here, I actually do have experience with manufacturing specialty aerospace fasteners similar in size, shape, complexity, and precision as these. These are most assuredly being manufactured on a specialty tool called a “Swissing Lathe”, or Swiss CNC machine, because that is the machine you always use to make parts like this. It is a multi-headed turret mill combined with a lathe that can continuously feed a piece of long bar stock and continually spit out fasteners. They were invented many years ago to produce extremely high precision small screws for watches, and in fact Citizen is one of the main vendors of these tools to this day. Based on my experience I would expect the cycle time for making this part to be 30 seconds or so.

Here’s a good video that eli5’s the difference between a Swiss screw machine and conventional CNC.

https://youtu.be/y3y0tATB0lg?si=pkYDT3BV0-6C-aq5

And here’s a video with a high quality soundtrack that shows how the machine combines automatic lathe cuts, mill cuts, and thread rolling without changing machines, swapping cutters, or re-fixturing the work.

https://youtu.be/MPAK5I1HJAw?si=fnMmjDp6ydYSDbfH

And if you need some specialty fasteners made and have an unlimited budget I can reccomed these folks.

https://centrix-us.com/