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Rule 1Dimensions should reflect the actual size of an object, not the scaled size
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Rule 2Include overall dimensions in the three principle directions; width, height, and depth
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Rule 3Include all dimensions necessary to produce or inspect a part
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Rule 4Do not include unnecessary dimensions
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Rule 5Dimensions should be attached to the view that best shows the contour of the feature to be dimensioned
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Rule 6A dimension should be attached to only one view, example; Extension lines should not connect two views
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Rule 7Whenever possible, locate dimensions between adjacent views
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Rule 8Avoid dimensioning hidden lines
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Rule 9Do not place dimensions on the object unless it is absolutely necessary
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Rule 10Do not cross dimension lines with other dimension lines or with extension lines
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Rule 11Avoid crossing dimension or extension lines with leader lines
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Rule 12Leader lines point towards the center of the feature and should not occur horizontally or vertically
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Rule 13Dimension numbers should be centered between arrowheads, except when using stacked dimensions, then the numbers should be staggered
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Rule 14In general, a circle is dimensioned by its diameter and an arc by its radius
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Rule 15Holes should be located and sized in the view that shows the feature as a circle
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Rule 16Holes are located by their center lines, which may be extended and used as extension lines
