Set screw?
I think the dark part in the screw illustration is a void as opposed to a screw point. If that is your query!. Maybe more correct to call it a machine screw.
@freezing77 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Set screw?