What is the name of the hole defect that appears slightly grooved on the interior?

The defect referred to as "rifled" describes a type of hole that has a slightly grooved or internal texture resembling the rifling found in gun barrels. This grooving can occur due to improper machining techniques or the use of worn tools, resulting in a surface that is not smooth. Unlike the other options, which pertain to different characteristics of holes or processes, the term "rifled" specifically captures the visual and physical texture of the defect, making it a precise descriptor in the context of aerospace assembly and manufacturing.

The term "barreled," for instance, may suggest a wider or tapered hole but does not convey the specific grooved nature. "Angled hole" refers to a hole drilled at a certain angle but does not imply any surface characteristics. "Deburr" is a process used to remove sharp edges or burrs from machined components and does not describe a type of defect. Therefore, "rifled" is the most accurate description for the defect in question due to its distinct grooved appearance.