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Remember that Size Controls Form (#53)

(In accordance with the ASME Y14.5-2018 standard)
(In accordance with the ASME Y14.5-2009 standard)
(In accordance with Y14.5M-1994 standard)

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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 40mm 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.

This tip is in accordance with ASME Y14.5M-1994, Y14.5-2009 and Y14.5-2018
This tip was originally released in April 2002.

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Back to Tips Tip added Sep 2022