ISO/TC 19 - Preferred numbers
Standardization in the field of selection of numbers, including preferred series, and coordinating principles, with the intention of providing a structure for varieties based on economic calculation to take full advantage of the series effects and to promote harmonization and compatibility at the interfaces.
Standardna števila
Standardization in the field of selection of numbers, including preferred series, and coordinating principles, with the intention of providing a structure for varieties based on economic calculation to take full advantage of the series effects and to promote harmonization and compatibility at the interfaces.
General Information
This is an additional guide to ISO 17 for selecting specified series with more rounded values. It shows the conditions for the use of these preferred numbers.
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The best scale will be determined by taking into consideration, in particular, the two following contradictory tendencies: a scale with too wide steps involves a waste of materials and an increase in the cost of manufacture, whereas a too closely spaced scale leads to an increase in the cost of tooling and also in the value of stock inventories. In selecting a scale of numerical values, choose that series having the highest ratio consistent with the desiderata to be satisfied, in the order: R 5, R 10, etc.
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Preferred numbers are the conventionally rounded of term values of geometrical series, including the integral powers of 10 and having as ratios special factors in accordance with the specified tables. Basic, expectional, R 80 and derived series are designated.
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