A broken-out section is a type of sectional view where only a small, localized portion of an object is cut away to expose internal features, while the rest of the view remains untouched. Unlike full or half sections that use cutting planes across the entire part, a broken-out section reveals just enough of the interior to show specific details—such as a hole, groove, or pocket—without redrawing the entire part in section.
The cut area is typically enclosed by an irregular, freehand break line that looks somewhat jagged or wavy. This line separates the sectioned portion from the unsectioned portion and indicates where the material is imagined to be removed. Within the broken-out area, hatch lines are applied to show the exposed solid material.
Broken-out sections are useful when only a small internal feature needs to be shown and a full or half section would be unnecessary or too intrusive. They help keep the drawing simple and uncluttered while still providing clear access to critical internal geometry. This makes them particularly effective in assembly drawings or in parts with isolated features, where showing just a glimpse of the inside is enough for communication or manufacturing.