What Are Tolerances on Dimensions with Deviations in DIN 16901?

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DIN 16901 outlines tolerances for dimensions, but confusion arises regarding the interpretation of tolerances with deviations. The first half of the tolerance table includes standard plus and minus values, while the second half lacks these symbols, leading to questions about their interpretation. It is suggested that these second set tolerances may be assumed as positive, potentially being double the values of the first set. Clarification is sought on what "tolerances on dimensions with deviations entered against the dimensions" specifically means in practical applications. Understanding these tolerances is crucial for accurate inspection and compliance with the drawing specifications.
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Hi all,

i have stumbled across a drawing which referenced DIN 16901 for its tolerance. I have a table of DIN 16091 which i don't understand.

For the first half of the tables, the tolerances are + and -, which i understand. The second half (tolerances on dimensions with Deviations entered against the dimensions) are without +/- symbols. Can i assume that the tolerances are always + ?

DIN16091_tolerance.jpg


Thanks guys for your help!
 

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It looks like the second set of numbers are just twice the top set for the given row/col

so if the cell says +-0.20 then the corresponding cell says 0.40
 
it Looks like it as well, but what are "tolerances on dimensions with deviations entered against the dimensions"?
I am inspecting a sampe, and have a drawing and the dimensions are with no tolerances. The only indication is in the remark section, "tolerances are according to DIN 16901".
 

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