If a hole goes completely through the feature and it is not clearly shown on the drawing, the abbreviation “THRU” follows the dimension.
What do you think a countersunk hole is used for?
Dimensioning and Tolerancing. drilled hole. Location. the slot in Figure 14.50 is.004" and the tolerance of the mating part is.002".DESIGN DRAWING ...
CAD Drawing for Frame 182 Waterproof AC Induction Motor (TEFC) (Model Number WD-3A2-4-3.0-182TC)