Leah,
Quote:
1.8.10 Round Holes
Round holes are dimensioned as shown in Fig. 1-36.
Where it is not clear that a hole goes through, the notation THRU follows a dimension. Where multiple features
are involved, additional clarification may be required.
The depth dimension of a blind hole is the depth of the
full diameter from the outer surface of the part. Where
the depth dimension is not clear, as from a curved surface, the depth should be dimensioned pictorially. For
methods of specifying blind holes, see Fig. 1-36.
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I have attached an example from the spec for you to review as well.
There are many different standards to "draft" to, all mean the same thing, just different verbage. For example, if you had three thru holes that were 1/4" and wanted to maintain 0.005", it would appear as:
3X Ø.250 THRU
Hope this helps,
-Tim