Line Conventions, Continued
Dimension lines
Lines that define the parameters of a dimension are called dimension lines.
Dimension lines are thin lines terminating in arrowheads. Place dimension
lines no closer than 3/8" from the object outline. Parallel dimension lines
should be a minimum of 1/4" apart. You may place parallel dimension lines
more than 1/4" apart so long as the spacing between dimension lines is
uniform throughout the drawing. Dimension lines are generally broken in
the center of the line to provide a space for the dimension figure. Dimension
figures for parallel dimension lines are staggered. In some structural or
architectural drawings, you may find dimension figures placed above the
dimension line.
Figure 3-14 illustrates dimension lines.
Figure 3-14.—Dimension lines.
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