What is a primary characteristic of a centerline in drafting?

A primary characteristic of a centerline in drafting is that it indicates the axis of symmetry. Centerlines are essential in technical drawings as they represent the line around which a feature is symmetrically arranged. This characteristic is crucial for accurately depicting shapes and ensuring that components are centered and balanced, particularly in symmetrical objects such as cylinders, holes, or any element where symmetry is critical.

While centerlines do extend infinitely in both directions, this property primarily applies to construction lines and not specifically to the functional aspect of symmetry identification. Centerlines do not represent hidden features nor solely define points of intersection; instead, they serve the specific purpose of denoting symmetry in the design, which aids in the manufacturing process and assembly of parts.