Machinery's Handbook, 31st Edition
2708 Sheet Metal Gages Metric Sizes for Flat Metal Products.— American National Standard B32.100-2016 establishes a preferred series of metric thicknesses, widths, and lengths for flat metal products of rectangular cross section; the thickness and width values are also applicable to base metals that may be coated in later operations. The standard also establishes a pre- ferred series of metric sizes for round and hexagonal metal products. The First Choice of sizes of this standard are derived from Renard’s R5 series of pre ferred numbers (see American National Standard for Preferred Numbers on page 687, also ANSI/ASME B4.2 or ISO 497) in which each preferred number is approximately 60 percent larger than the preceding number in the series. The Second Choice series are derived from the R10 series in which each number is approximately 25 percent larger than the preceding, and Third Choice sizes are generally from the R20 series in which each number is approximately 12.5 percent larger than the preceding number. Table 4a gives preferred metric diameters from 1 to 500 millimeters for round metal products; Table 4b lists the preferred thicknesses; Table 4c lists the preferred widths. Wherever possible, sizes should be selected from the First Choice series shown in the ta- bles. Second and Third Choice series are also shown. For preferred metric diameters less than 1 millimeter, preferred across flat metric sizes of square and hexagon metal prod - ucts, preferred across flat metric sizes of rectangular metal products, and preferred metric lengths of metal products, reference should be made to the B32.100-2016 Standard. Table 4a. American National Standard Preferred Metric Diameters of Round Metal Product ANSI/ASME B32.100-2016 Basic Size, mm Basic Size, mm First Choice Second Choice Third Choice First Choice Second Choice Third Choice
1
… 1.1 … 1.4 … 1.8 …
25 … … … 40 … … … 60 … … … … … … … … … … … …
… … 1.2 … … …
… … 30 … … … 50 … … … 80 … … …
…
… …
26, 28
…
32, 35, 36, 38
1.6 … … … 2.5 … … …
…
42, 45, 48
2
…
… … …
2.2, 2.4
55, 56
…
…
2.6, 2.8
63, 65, 70, 75
3
…
…
… 3.2, 3.5, 3.8
85, 90, 95
4
100
… … … … … 5 … … … 12 … … … 8 20
…
…
… … … … … … 10 6 … … … 16 … … …
4.5, 4.8
105, 110
120
… 5.5 …
…
… 125, 130, 140, 150
160
… … … … … 200 300
…
6.5, 7, 7.5
170, 180, 190
…
…
8.5, 9, 9.5
220, 240
250
… 11 …
…
260, 280
…
13, 14, 15
… 320, 340, 350, 360, 380
…
400 … … …
…
…
17, 18, 19
… 420, 440, 450, 480
500
…
… …
… 21, 22, 23, 24
…
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