Table 3 - Metal Sheet Sizes
Metal Sheet Sizes
The metric coarse thread pitch is slightly smaller (finer) compared to the customary unified coarse thread pitch. For example; the metric coarse thread M8 has the thread pitch 1.25 mm and the inch thread 5/16-18 (7.94 mm) has the thread pitch 1.41 mm.
Preferred metric sizes for thin metal flat products (sheets) in the range from 0.4 through 4 mm follow the sizes shown in TABLE 3. We used to specify even gage numbers for cold rolled material years ago, and now with the First Choice selection in the ANSI B32.100 standard, it is recommended you specify the first choice sizes or in four gage number increments.