What represents the features of the part on a blueprint?

The features of the part on a blueprint are represented by object lines. Object lines are continuous bold lines that define the outlines and shapes of the physical components being drawn. They convey the actual forms of the parts, making them essential for understanding the design and structure of the item represented.

By using object lines, the designer effectively communicates the geometry of the part, allowing anyone interpreting the blueprint to visualize the object clearly. Other line types serve different purposes; for instance, dimension lines indicate measurements, extension lines indicate where dimensions start or finish, and leader lines point to a note or symbol. These lines complement the object lines but do not describe the actual features of the part itself.