4/6/2024 0 Comments H6 tolerance chart metric![]() Nominal metric sizes are identical where the metric system has been in use for several years. The R5, R10 and R20 series refers to the Renard 5 (first choice sizes 60 % increments), Renard 10 (second choice sizes 25 % increments) and Renard 20 (third choice sizes 12 % increments) series of preferred numbers, see ISO 3. Its first known application was in the 1870’s by Charles Renard, a French army captain who reduced the different diameters of rope for military balloons from 425 to 17. This is a geometrical series of numbers adopted worldwide. The preferred numbering system has played a major role in the development of metric standards.
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