ANSI 14.5 Hole Notes

[TroyCDH]

Hi Leah,

I have attached a jpeg for you to look at. The term "Thru All" is out of date for drawings. ANSI & ASME have been creating standards that are more consistent with the global industry. Minimize text and increase symbols. I have the ASME Y-14.5-2009 book and I do not see the term "thru all" anyplace.

That said, it is still a very common practice here in the U.S. to see "Thru All' on new drawings. Assuming the drill bit is long enough to cut thru all or "thru both walls" (another common term) it covers the one motion of the drill press or milling machine. There is no x-y location movement to a second hole.

3D CAD designers are also very use to the term "thru all" for creating cuts/holes as well.

So either call out will work. If you do not know your audience (the machinist) I would side with ASME Standard. Clarification can be helped by showing your ISO view at an angle to show both holes. A section view could be shown as well but that will make for a busy drawing when the ASME "2X" will do.

Troy