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In most of the world, sheet metal thickness is consistently specified in millimeters. In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.
For example, if a shaft with a nominal diameter of 10 mm is to have a sliding fit within a hole, the shaft might be specified with a tolerance range from 9.964 to 10 mm (i.e., a zero fundamental deviation, but a lower deviation of 0.036 mm) and the hole might be specified with a tolerance range from 10.04 mm to 10.076 mm (0.04 mm fundamental ...
There are several errors in the thickness and tolerance charts. e.g. the nominal thickness for stainless steel 16ga sheet should be .0625". The thickness ranges is the tolerance chart do not line up properly with the gauge column and the values are not in agreement with the thickness chart.
Example of true position geometric control defined by basic dimensions and datum features. Geometric dimensioning and tolerancing (GD&T) is a system for defining and communicating engineering tolerances via a symbolic language on engineering drawings and computer-generated 3D models that describes a physical object's nominal geometry and the permissible variation thereof.
Hot-rolled and cold-rolled high-strength low-alloy steel sheets and strip with improved formability A715 Gr. 50 50 60 1.20 22 Gr. 60 60 70 1.17 18 Gr. 70 70 80 1.14 14 Gr. 80 80 90 1.13 12 55% aluminum-zinc alloy-coated steel sheet by the hot-dip process A792 Gr. 33 33 45 1.36 20 Gr. 37 37 52 1.41 18 Gr. 40 40 55 1.38 16 Gr. 50A 50 65 1.30 12
Thus an internal feature of size (e.g., a hole) at its biggest diameter, or an external feature of size (e.g., a flange) at its smallest thickness. The GD&T symbol for LMC is a circled L. (See also MMC and RFS.) A given geometric tolerance may be defined in relation to a certain FoS datum being at LMC or at MMC.
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