![]() ![]() RE: minus minus tolerance dgallup (Automotive) 20 Jun 10 14:40 is 30 but the tolerance is -/-, only the indication on a drawing could be different. And in fact cases a & b are similar to the OP's dilemma - nominal dim. Y14.5 standard indeed does not use -/- description for a tolerance, but actually gives an example of limits and fits indication. standard fundamental deviations from nominal dimensions which are later used in fit description, standard tolerances for certain ranges of nominal dimensions depending on the tolerance class, There is a whole norm (ISO 286) that specifies: For instance a shaft and a hole which are going to fit together have the same nominal diameter and by looking only at tolerances one can almost immediately say whether the fit is loose, transition or press. As J-P mentions on his blog it is commonly used when limits and fits are considered. In ISO world this style of dimensioning is nothing weird. ![]()
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