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Remember that Size Controls Form
(In accordance with Y14.5M-1994 standard)

PDF of this Tip

Below is a redraw of a print that was sent to me by a supplier who wanted to quote on the job but was concerned that he did not have any equipment that could measure the cylindricity callout. I pointed out that by correctly inspecting the size of the 40 mm hole according to Rule #1 of the Y14.5 standard, the form (straightness, circularity and cylindricity) of the hole would all have to be within 0.04. In other words, the hole must accept a full form go-gage not smaller than 39.98 and the actual local size at each cross section must not exceed 40.02. The cylindricity requirement in this case is redundant given the size tolerance.

Back to Tips Tip added Apr 2002