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Its been a while since I've used my GD&T knowledge

When using a symbol like parallelism // the numbers next to it in the box is that a band or a tolerance. Say its stated as .125 inside the box, is that +/- .125 or is that a band of .125 or a tolerance of +/- .0625?

Thanks in advance,


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It's a band. The surface affected by the marking must be parallel to Datum Y defined as two theoretical planes both dead parallel to Y that are 0.12 apart.