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Flatness and Straightness Have Changed (#278)

(In accordance with the ASME Y14.5-2009 standard)

PDF is Available with GD&T Reference Center Subscription.

Some revisions to the Standard are made because they just make sense. In the 1982 revision of the Y14.5 standard, "as an extension of principle", straightness could be applied to the size dimension of a width as well as a cylinder. The tolerance was described as two parallel planes separated by the amount of the tolerance. The derived center plane …

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