GD&T Tips - Rules - Simultaneous Requirement

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If you don’t want a pattern, you have to say so - 1994, 2009, 2018 (#31)

(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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Because of the simultaneous requirements rule stated in the Y14.5 Standards (section 4.5.12 in 1994, 4.19 in 2009, and 7.19 in 2018), if features are controlled relative to the same datum reference frame (same datums, same precedence, same modifiers), the features are considered to be a pattern. Both drawings shown below indicate that the two …

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Back to Tips Tip added Nov 2020

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