There are several basic rules to drawing section linings that have a
professional finished appearance.
To draw professional looking section linings. follow these rules:
Section lining is always bound by visible lines.
Do not overdraw section lines beyond visible lines.
Visible lines never pass through an area of section lining.
Section lines should be thinner than visible lines.
Section lines should be uniformly thin, even in weight and with good
Section lines within a sectioned area must be parallel.
Uniformly space lines in section linings.
Space section lines between 1/16- to 1/8-inch apart depending on the size
of the drawing. For average section linings, space the section lines
approximately 3/32-inch apart.
Always draw section lines at 45 degrees to the horizontal.
If section lines drawn appropriately at a 45-degree angle are or appear
nearly parallel or perpendicular to a prominent visible outline, change the
angle of the section lining to another easily drawn angle such as 30 or 45
Avoid dimensioning on sectioned areas and over section linings. When
this is unavoidable, remove the section lining in the areas where the
When two or more parts in a section are adjacent, use section linings in
You may limit drawing section lines to areas adjacent to the outline of
sectioned areas, called outline sectioning, providing the drawing remains
Figure 3-64 shows examples of correct and incorrect section lining.
Figure 3-64.Correct and incorrect section linings.