I know its probably been answered before, but I'm not really sure what to google to find the answer.
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\$\begingroup\$ It's a mechanical outline drawing of an IC. \$\endgroup\$– John DCommented Jul 29, 2016 at 17:04
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5\$\begingroup\$ Probably OP wants to ask about the symbol marked in red rectangle. \$\endgroup\$– WhiskeyjackCommented Jul 29, 2016 at 17:05
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\$\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\$– James OldigesCommented Jul 29, 2016 at 17:05
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1\$\begingroup\$ Sorry, I misunderstood the question. \$\endgroup\$– John DCommented Jul 29, 2016 at 17:08
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\$\begingroup\$ Could be this one: gdandtbasics.com/maximum-material-condition \$\endgroup\$– MarioCommented Jul 29, 2016 at 17:08
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2 Answers
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It indicates position tolerance in inches and (mm).
More info on this pdf.
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.
answered Jul 29, 2016 at 17:08
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1\$\begingroup\$ Just found this doc too :) Well, you win. \$\endgroup\$ Commented Jul 29, 2016 at 17:09
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2\$\begingroup\$ The (M) is described a few pages later - it's the "maximum material condition". \$\endgroup\$– user39382Commented Jul 29, 2016 at 17:10
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\$\begingroup\$ @EugeneSh. - well, its the first result on google-fu. \$\endgroup\$ Commented Jul 29, 2016 at 17:10
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\$\begingroup\$ @duskwuff - thanks, I'll add the info on the answer \$\endgroup\$ Commented 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.
