What does M3x0.5 mean by tapping a drill bit?
That is, the thread with a thread diameter of 3 mm, with a pitch of 0.5 mm.
M3 * 0.5 represents a 3 mm screw with a pitch of 0.5 mm. With a diameter of 3 minus 0.5 equals 2.5 pitch dia. It is to drill 2.5 holes with a drill, and then tap with a M3 tap.
