Is "THRU" actually required? 3

[Th.Ro.]

Is it actually required to put a "THRU" or "THRU ALL" on a through-hole?
ASME Y14.5 (2009) specifies: "Where it is not clear that a hole goes through, the notation THRU follows a dimension."
Any other cut-out geometry is by default assumed to go all the way through a part body if no depth or end condition is defined. Why should holes be treated differently?
I feel, if no depth is given or end condition defined a hole has to be assumed to go through and adding the "THRU" would over-defining the drawing.

 

[3DDave]

There are some things that are long-standing convention that don't do any harm. At least when "THRU" is used anyone reading the drawing doesn't have to wonder if they simply have missed a view that clarified the depth or wonder if the drawing creator forget to specify one. Most other features don't have a single dimension to which such a notation would be attached; using it there would simply crowd the drawing. But, as the standard indicates, if it is clear, then you don't have to use it.

 

[ctopher]

Try not putting any depth callout, take it to the machinist and ask him/her how they interpret how deep to make it. You will get your answer.
If it's THRU, add "THRU".

ctopher, CSWP
SolidWorks '17
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SolidWorks Legion

 

[drawoh]

Th.Ro.,

If you have side and opposite views on your drawing, the depth will be obvious.

--
JHG

 

[TheTick]

What takes longer?

a.) Adding "thru" to a callout.

2.) Fielding phone calls and walk-ups asking what you meant, and eventually doing an ECN to undo your laziness.

 

[CheckerHater]

With 3D CAD cutting a section is even faster

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

[ewh]

The goal of a good drawing should be to define the part in a clear, concise manner subject to only one interpretation.
If it is obvious that a hole is thru, stating such subtracts from how concise the definition is.

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV

 

[TheTick]

Generally, I agree with ewh. I prefer not to overstate the obvious. But I've learned its better to not overestimate downstream customer's drawing literacy, "Obvious" needs to be OBVIOUS.