ASME B32.100:2005 pdf download Preferred Metric Sizes for Flat, Round, Square, Rectangular, and Hexagonal Metal Products
1 SCOPE
This Standard establishes a preferred series of metricthicknesses, widths, and lengths for flat metal productsof rectangular cross-section. The thicknesses and widthsshown in this Standard are also applicable to base metals that may be coated in later operations. This Standardalso establishes a preferred series of metric sizes forround,square, rectangular, and hexagonal metal prod-ucts.
2 GENERAL
The sizes in this Standard provide an orderly seriesof thicknesses for all flat metal products and widths forrectangular cross-section metal products.The series wasdeveloped to provide a reasonable selection of metalthicknesses from 0.050 mm to 300 mm and of metalwidths from 10 mm to 5000 mm In each case, the seriesprovides for some second, third, and sometimes fourthchoice sizes (thicknesses and widths) to cover instanceswhere selection from the primary preferred sizes maybe inadequate. Sufficient coverage in logical steps is presented in the tables to adequately serve most of the general purpose requirements of industry for flat metalproducts. The Standard also provides an orderly seriesof lengths for flat metal products.
This Standard also provides a series of sizes for eachof round, square, rectangular, and hexagonal forms ofmetal products used for general applications. The serieswas developed to provide a reasonable selection ofmetal diameters from 0.020 mm to 320 mm for roundsand distance across flats from 3 mm to 300 mm forsquares, various cross-section sizes from 1.6 mm by 2 mmto 100 mm by 200 mm for rectangles, and from 1.5 mmto 150 mm for hexagons.The series provides for somesecond, third, and fourth choice diameters for rounds andsecond and third choice distance-across-flats for squaresand hexagons where selection from the primary preferredsizes mav be inadequate.The series also provides for preferred lengths of rounds, squares, rectangles, and hexagons. Sufficient coverage in logical steps is presented inthe tables to adequately serve most of the general purpose requirements of industry for round, square, rectan-gular, and hexagonal metal products.
It is recognized that for some applications, particularly large volume requirements in some metals for spe cific end uses, precise engineering requirements dictatta need for sizes other than those presented in this Standard, This Standard is in no way meant to preclude theuse of such sizes where they are required. However, forgeneral purpose applications or where requirementspermit some latitude in the selection of thickness orthickness/width/length combinations,the simplifiedpreferred sizes given in this Standard should facilitateinterchangeability of metals in design, reduce inventories, and increase the availability of warehouse stocksof those sizes commonly used for general purpose applications. In such instances, the use of sizes listed inthis Standard is to be encouraged.
All of the sizes included in this Standard are not necessarily produced in all metals and grades. Producersor distributors should be consulted to determine availability of a particular thickness or thickness/width combination for a given metal product.
3 USE OF TABLES
Wherever possible, sizes should be selected from thecolumns headed “First Choice.” Only if no size in the preferred list is suitable should a selection be made from thecolumns headed “Second Choice”or“Third Choice.Lengths should be selected from the preferred list.
4 BASIS OF TABLES
The sizes in this Standard are derived from a list of preferred metric sizes in which each number is approximately60% greater than the number preceding it (ANSI B4.2 orISO 497 Series R5″) Second Choice sizes are in increment.of 25%(Series R10′) and Third Choice sizes in incrementsof 12% (Series R20′). Some deviations from this principleoccur as the result of minor rounding. The selected sizesalso reflect standard material sizes in ISO and nationalstandards in traditional metric countries.
5 TOLERANCES
Material product tolerances are shown in applicablinternational or national product standards. Normal tolerances shown in international standards are generallylarger and could be up to twice as large for metric material compared with customary inch tolerances used in
ASME B32.100:2005 pdf download
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