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What is the difference between upper and lower dimmensions in schematics?

So far I have assumed that those are simply maximum and minimum values specified by the tolerance. Is my assumption correct?

Edit 1:

There is also a statement bellow the datasheet that tolerances are +/- 0.15mm which is inaccurate in the case of 3.60/3.20 (or 2.90/2.50).

A relevant schematics here:

enter image description here

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  • \$\begingroup\$ @Armandas thank you, yes, the answer is really similar to the one you provided but please see my edit. \$\endgroup\$
    – sitilge
    Mar 19, 2016 at 14:16
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    \$\begingroup\$ BTW, that isn't a schematic, that's a mechanical drawing. \$\endgroup\$
    – Dave Tweed
    Mar 19, 2016 at 14:16

1 Answer 1

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Yes, you are right. Sometimes manufacturers specify min/max and sometimes just average value and state tolerance.

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  • \$\begingroup\$ There is also a statement bellow the datasheet that tolerances are +/- 0.15mm which is inaccurate in the case of 3.60/3.20 . Am I missing something here? \$\endgroup\$
    – sitilge
    Mar 19, 2016 at 14:06
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    \$\begingroup\$ 0.15 mm applies when the error is NOT specified otherwise, e.g. in the pin spacing (1.80) on the left. \$\endgroup\$
    – user16324
    Mar 19, 2016 at 14:20

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