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A very simple question, so sorry for this, but I have searched many online docs and cannot find a simple answer. I have a hole specification of 3.4 + 0.13 (picture attached).

What does the +0.13 mean?

[example1

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If I am not mistaken this probaly refers to the tolerances (the lower and higher acceptable dimensions of the diameter of the circle).

i.e. : minimum is 3.40mm, and maximum should be 3.53mm

In your particular example you need 4 thru holes within the tolerances stated above [3.40, 3.53].

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