Dimensioning, ContinuedRounded holesWhere it is not clear that a hole goes through an object, the abbreviation“THRU” follows the dimension. A blind hole is a hole that does not passcompletely through the object. The depth dimension of a blind hole is thedepth of the full diameter from the surface of the part. Where a blind hole isalso counterbored or counterdrilled, the depth dimension applies from theouter surface.Figure 3-30 shows how to correctly dimension round holes.Figure 3-30.—Dimensioning rounded holes.Continued on next page3-34
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