Category: Orientation

Parallelism

by GD&T Basics on December 20, 2014.

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

Perpendicularity

by GD&T Basics on December 14, 2014.

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

Angularity

by Tom Geiss on November 7, 2014.

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°.