Category: Orientation

Angularity

by Jason Richter on October 26, 2026.

Controls a surface or axis at an exact angle relative to a datum. Requires a basic angle dimension — it's the orientation call for everything that isn't 0° or 90°.

Parallelism

by Jason Richter on October 15, 2026.

Controls a surface or axis so it runs exactly parallel to a datum. Zero degrees is implied — no basic angle needed.

Perpendicularity

by Jason Richter on September 17, 2026.

Controls a surface or axis at exactly 90° to a datum. Squareness has a formal definition in GD&T, and this is it.