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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:
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FREE AIR New Zealand defunct FP FRE Freedom Air: FREEDOM United States Aviation Services FFF Freedom Air Services: INTER FREEDOM Nigeria FRL Freedom Airlines: FREEDOM AIR United States ICAO Code and callsign withdrawn FAS Freedom Airways: FREEDOM AIRWAYS Cyprus FWC Freeway Air: FREEWAY Netherlands Defunct FRG Freight Runners Express: FREIGHT ...
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The number following the DN is a nominal value that is roughly the number of millimeters of a circular feature on the connection point of the pipe, fitting, coupling, etc., but often differing by a noticeable amount. If the DN value is related to the internal bore diameter of the feature, the size should be represented by DN/ID (for Inside ...
Download as PDF; Printable version; In other projects Wikidata item ... E3 series may refer to: E3 series (preferred numbers), a series of standardized resistor and ...