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  • BSI
    BS 2856:1973 Precise conversion of inch and metric sizes on engineering drawings
    Edition: 1973
    $316.70
    / user per year

Description of BS 2856:1973 1973

This British Standard provides a procedure for conversion which will give the essential accuracy required for precise dimensional interchangeability.

The standard lays down an optimum fineness of rounding the converted size so that the conversion is made with the required precision and, at the same time, an excessive number of decimal places in the converted size is avoided. The procedure adopted is designed to ensure correct acceptance or rejection of a component, with respect to sizes, whether manufactured in one system of units or the other, provided that the methods of measurement used in the two systems are of comparable accuracy.

The conversion factor used

is: 1 inch = 25.4 millimetres.

This conversion factor is exact. It results from the legal definition of the yard in terms of the metre adopted by the USA in 1959 and by the UK in the Weights and Measures Act 1963. The values given in the tables in Appendix A are taken to a sufficient number of decimal places to cover the finest rounding required by the rules for conversion of inch and millimetre sizes.



Provides a procedure for the conversion of inch and metric sizes on engineering drawings which will give the essential accuracy required for precise dimensional interchangeability. The standard gives specific guidance on the optimum fineness of rounding the converted size, and recommends a procedure for conversion which takes the form of simple rules covering successive steps in the conversion. Examples of the application of the rules are given for a variety of cases. Tables of conversion from inches to millimetres, and vice versa, are included in an appendix to facilitate the work.

Standard NumberBS 2856:1973
TitlePrecise conversion of inch and metric sizes on engineering drawings
StatusConfirmed
Publication Date1973-10-08
Related National Standard OfISO 370
DescriptorsDimensions, Conversion (units of measurement), Tables (data), Technical drawing, Rounding (numbers), Imperial system, Engineering drawings, Units of measurement, Untoleranced dimensions, SI system (metric)
ICS01.100.01 Technical drawings in general, 01.060 Quantities and units, 17.040.10 Limits and fits
CommitteeTPR/1
ISBN0 580 07752 7
PublisherBSI
Pages16

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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