When angularity is called out on an axis, the tolerance zone now becomes a cylinder around the referenced axis at an angle to the datum. Maximum material condition or axis control can also be called out for angularity although the use in design and fabrication is very uncommon since gauging a hole or pin at an angle is difficult. See the tolerance zone below for more details. The tolerance indirectly controls the angle by controlling where the surface can lie based on the datum. In fact, the angle, for now, becomes a Basic Dimension, since it is controlled by your geometric tolerance. The tolerance does not directly control the angle variation and should not be confused with an angular dimension tolerance such as ± 5°. It can reference a 2D line referenced to another 2D element, but more commonly it relates the orientation of one surface plane relative to another datum plane in a 3-Dimensional tolerance zone. GD&T Symbol: Relative to Datum: Yes MMC or LMC applicable: Yes (Uncommon) Drawing Callout:Īngularity is the symbol that describes the specific orientation of one feature to another at a referenced angle.
