A
blind hole refers to a hole that is
reamed,
drilled, or
milled to a specified depth without breaking through to the other side of the workpiece. The etymology is that it is not possible to see through a
blind hole. Other types of holes also include
through holes, and clearance holes. In this instance blind may also refer to any feature that is taken to a specific depth. More specifically referring to internally
threaded hole (tapped holes).