Here's a more detailed breakdown:
M4 Designation:
The "M" stands for "metric" and the "4" indicates the nominal shank diameter in millimeters.
Rivet Diameter:
The shank diameter of an M4 rivet is indeed 4mm.
Other Dimensions:
Depending on the type of rivet (e.g., flat head, button head), the overall diameter of the head and the shank may vary. For example, a flat head M4 rivet might have a head diameter of 5.9mm.
Tubular Rivets:
Tubular rivets, also known as hollow rivets, have a hollow shaft, which allows them to be used in various materials and applications.
