What is the term for a hole that does not go completely through the workpiece?

The term for a hole that does not go completely through the workpiece is a blind hole. This type of hole is characterized by having a defined depth but not extending through both sides of the material. Blind holes are often used in applications where internal threading or securing components are needed without exposing the hole on the opposite side. They allow for a cleaner finish and can help maintain the structural integrity of the workpiece, which might be crucial in various engineering designs where both aesthetics and function are important.

In contrast, a through hole extends completely through the material, creating an opening on both sides. An open hole and a closed hole are less specific terms and do not conventionally refer to recognized types of holes in engineering design, which can lead to confusion. Thus, the use of the specific term "blind hole" accurately conveys the intended meaning in a technical context.