I know its probably been answered before, but I'm not really sure what to google to find the answer.

enter image description here

  • It's a mechanical outline drawing of an IC. – John D Jul 29 '16 at 17:04
  • 5
    Probably OP wants to ask about the symbol marked in red rectangle. – Whiskeyjack Jul 29 '16 at 17:05
  • I'm not sure what you mean. That looks like numerical data to me.... I'm talking about the stuff in the red box fyi – James Oldiges Jul 29 '16 at 17:05
  • 1
    Sorry, I misunderstood the question. – John D Jul 29 '16 at 17:08
  • Could be this one: gdandtbasics.com/maximum-material-condition – Mario Jul 29 '16 at 17:08
up vote 12 down vote accepted

It indicates position tolerance in inches and (mm).

More info on this pdf.

enter image description here

As comments in the question and this answer point out, the "M" in a circle stand for "Maximum Material Condition", as in largest pin width or smallest hole.

enter image description here

  • 1
    Just found this doc too :) Well, you win. – Eugene Sh. Jul 29 '16 at 17:09
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    The (M) is described a few pages later - it's the "maximum material condition". – duskwuff Jul 29 '16 at 17:10
  • @EugeneSh. - well, its the first result on google-fu. – Wesley Lee Jul 29 '16 at 17:10
  • @duskwuff - thanks, I'll add the info on the answer – Wesley Lee Jul 29 '16 at 17:10

Which is a Drawing layout for the Machining, with the GD&T positioning tolerance The position tolerance M symbol represents Maximum material condition If there is L symbol That represents Least Material Condition.

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