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Hi all.. here is the answer..

Open tolerance:

These are the tolerance which needs only minor concentration from operator and QC. For ex. as per customer drawing, there may be some tolerance which has variation more than + or -1 mm.. this can be easily achieved..

Close Tolerance:

These are very crucial dimension which needs utmost effort and usually tolerances below +or - 1mm shall be considered as close tolerance.

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Q: What is the close and open tolerance in drawing?
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