What do dimension lines signify in a technical drawing?

Dimension lines are essential features in technical drawings that indicate the size and location of part features. They are typically represented as thin lines that extend outward from the edge of the feature and have arrowheads pointing to the endpoints, where the measurement is indicated.

These lines provide clarity regarding the dimensions, helping anyone interpreting the drawing understand the exact measurements required for manufacture or assembly. The measurements shown can include lengths, widths, heights, diameters, radii, and angles. By using dimension lines, the drawing communicates not only the size of features but also their spatial relationships within the part, which is critical for achieving proper fit and function in the final assembly.

While other options, such as weight, material type, or manufacturing process, may be relevant in broader contexts, they are not indicated by dimension lines specifically. Instead, such information would typically be provided elsewhere in the technical documentation, like in notes or in the bill of materials.