3
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I know its probably been answered before, but I'm not really sure what to google to find the answer.

enter image description here

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  • \$\begingroup\$ It's a mechanical outline drawing of an IC. \$\endgroup\$
    – John D
    Jul 29, 2016 at 17:04
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    \$\begingroup\$ Probably OP wants to ask about the symbol marked in red rectangle. \$\endgroup\$ Jul 29, 2016 at 17:05
  • \$\begingroup\$ 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 \$\endgroup\$ Jul 29, 2016 at 17:05
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    \$\begingroup\$ Sorry, I misunderstood the question. \$\endgroup\$
    – John D
    Jul 29, 2016 at 17:08
  • \$\begingroup\$ Could be this one: gdandtbasics.com/maximum-material-condition \$\endgroup\$
    – Mario
    Jul 29, 2016 at 17:08

2 Answers 2

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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

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  • 1
    \$\begingroup\$ Just found this doc too :) Well, you win. \$\endgroup\$
    – Eugene Sh.
    Jul 29, 2016 at 17:09
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    \$\begingroup\$ The (M) is described a few pages later - it's the "maximum material condition". \$\endgroup\$
    – user39382
    Jul 29, 2016 at 17:10
  • \$\begingroup\$ @EugeneSh. - well, its the first result on google-fu. \$\endgroup\$
    – Wesley Lee
    Jul 29, 2016 at 17:10
  • \$\begingroup\$ @duskwuff - thanks, I'll add the info on the answer \$\endgroup\$
    – Wesley Lee
    Jul 29, 2016 at 17:10
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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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