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A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the maximum thread diameter) and the pitch P, both expressed in millimetres and separated by a dash or sometimes the multiplication sign, × (e.g. M8-1.25 or M8×1.25).
English: Diagram of a 563 mm by 450 mm (22.5 in by 18 in) county route marker, made to the specifications of the 2004 edition of Standard Highway Signs or the 2012 Supplement to the 2004 edition (sign M1-6). Uses the Roadgeek 2005 fonts. (United States law does not permit the copyrighting of typeface designs, and the fonts are meant to be ...
English: Diagram of a 450 mm by 450 mm (18 in by 18 in) county route marker, made to the specifications of the 2004 edition of Standard Highway Signs or the 2012 Supplement to the 2004 edition (sign M1-6). Uses the Roadgeek 2005 fonts. (United States law does not permit the copyrighting of typeface designs, and the fonts are meant to be copies ...
For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use. Example (metric coarse): For M7.0×1.0, major minus pitch yields 6.0, but 6.1 also works well.
where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.
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English: An example of geometric dimensioning and tolerancing (GD&T) of a hole. Explanation: the cross signifies a position tolerance ; the tolerance is 0.02 mm ; the position is in reference to the datum planes A and B.
Means that a feature of size is at the limit of its size tolerance in the direction that leaves the most material on the part. Thus an internal feature of size (e.g., a hole) at its smallest diameter, or an external feature of size (e.g., a flange) at its biggest thickness. The GD&T symbol for MMC is a circled M.