Shown below are the most common symbols that are used with geometric tolerancing and other related
dimensional requirements on engineering drawings. Note the comparison with the ISO standards. Most of the
symbology is identical. There are a few symbols that are used in the ASME Y 14.5, 1994 standard that are being
proposed for the ISO standards. The symbols marked with an !°x!± are new or revised from the previous Y14.5
1982 standard.
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ISOASME Y 14.5, 1994ISO!°xY14.5M, 1982
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