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In industrial design, preferred numbers (also called preferred values or preferred series) are standard guidelines for choosing exact product dimensions within a given set of constraints. Product developers must choose numerous lengths, distances, diameters, volumes, and other characteristic quantities .
The E series of preferred numbers was chosen such that when a component is manufactured it will end up in a range of roughly equally spaced values (geometric progression) on a logarithmic scale. Each E series subdivides each decade magnitude into steps of 3, 6, 12, 24, 48, 96, and 192 values, termed E3 , E6 , and so forth to E192 , with maximum ...
The most basic R5 series consists of these five rounded numbers, which are powers of the fifth root of 10, rounded to two digits. The Renard numbers are not always rounded to the closest three-digit number to the theoretical geometric sequence:
ISO 17:1973 Guide to the use of preferred numbers and of series of preferred numbers; ISO 18:1981 Documentation — Contents list of periodicals; ISO/R 19:1956 Shipbuilding — Inland navigation — Deckbolts [Withdrawn without replacement] ISO/R 20:1956 Shipbuilding — Inland navigation — Rivets for Hatches [Withdrawn without replacement]
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A convenient number is a number which in several situations can prove convenient for use by humans for counting and measuring, and is related to preferred numbers (which are standard recommendations used for choosing product dimensions).
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