# Using Square Symbol on a square hole pattern

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• 01-21-2020, 04:00 PM
bhollehday
Using Square Symbol on a square hole pattern
Has anyone used the square symbol to define the shape of a square hole pattern? Definition from ASME-2009

[B][FONT=MetaPlusLiningBold]3.3.16 Square Symbol[/FONT][/B]
[FONT="Palatino-Roman"]The symbolic means of indicating that asingle dimension[/FONT]
[FONT="Palatino-Roman"]applies to a square shape shall be toprecede[/FONT]
[FONT="Palatino-Roman"]that dimension with the square symbol, asshown in[/FONT]
[FONT="Palatino-Roman"]Figs. 3-11 and 3-18. The symbol and thevalue shall not[/FONT]
[FONT="Palatino-Roman"]beseparated by a space.[/FONT]

The figure in 3-18 shows an example using the square feature on an external feature of size. I don't see why there would be any reason not to use it on a square hole pattern, or tolerance zone.
• 01-21-2020, 04:58 PM
Kelly Bramble
No... and I've seen a lot of engineering drawings.

Paragraph 3.3.16 Square Symbol ASME specification, the text does says " ... that a single dimension applies to a square shape shall...".

Let's focus on "square shape". Depending on how one defines square shape drives whether the symbology can be used to indicate a square pattern of features as well as a square feature of size.

Fig. 3-11 illustrates a square feature of size however there are no other references.

It would be my inflection that the square symbol could be used as a specification for a square hole pattern however, since it is a grey application I don't recommend it.

Sometimes the great debate in the heat of getting an engineering drawing out the door isn't worth it. Keep it typical and simple.
• 01-22-2020, 07:12 AM
jboggs
Just to be a contrarian (if that's a word), I use the square symbol in a few cases. When the intent is clear (can't be misinterpreted) and the drawing is already very busy, the square symbol can help to clean things up a bit, in my opinion.