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What does the encircled "2-" designate in the technical drawing below? Is it some standardized/common designation of something? "R" stands for the radius, and the numbers refers to the values in mm.

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The picture is an excerpt from the 6th page of this document. (I've added the red circles)

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2 Answers 2

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It means that there are two objects with that dimension. The same shape exists on the right-hand side of the FFC without dimensions, so "2-" is letting you know that side is the same as the left.

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It is specifying that there are two of those areas sharing the same dimension: -

enter image description here

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