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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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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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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Frequently Asked Questions
ISO/TC 19 is a Technical Committee within the International Organization for Standardization (ISO). It is named "Preferred numbers" and is responsible for: 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. This committee has published 3 standards.
ISO/TC 19 develops ISO standards. The scope of work includes: 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. Currently, there are 3 published standards from this technical committee.
The International Organization for Standardization (ISO) is an independent, non-governmental international organization that develops and publishes international standards. Founded in 1947 and headquartered in Geneva, Switzerland, ISO brings together experts from 170+ member countries to share knowledge and develop voluntary, consensus-based standards that support innovation and provide solutions to global challenges.
A Technical Committee (TC) in ISO is a group of experts responsible for developing international standards in a specific technical area. TCs are composed of national member body delegates and work through consensus to create standards that meet global industry needs. Each TC may have subcommittees (SCs) and working groups (WGs) for specialized topics.