A part is considered a reject when?

The statement that a part is considered a reject when dimensions are out of tolerance is accurate because it focuses on the primary function of manufactured parts to meet specific engineering standards. In machining and manufacturing, tolerance levels are established to ensure that parts will fit and function correctly within the assembly. When the dimensions of a part fall outside these established limits, it compromises the integrity and functionality of the part, leading it to be classified as a reject.

While aesthetic qualities, minor surface defects, and documentation can affect the overall quality or acceptance of a part, they do not directly impact the part's ability to perform its intended function as critically as dimensional accuracy does. This emphasis on precise dimensions ensures that quality control processes prioritize functionality and safety, making it vital to adhere to tolerance specifications.