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ANGULARITY
ORIENTATIONControls orientation at any angle to a datum
⚠ DATUM REQUIREDASME Y14.5-2018 §10.8
Angularity controls how much a surface, line, or axis can deviate from a specified angle (other than 0° or 90°) relative to a datum. The basic angle must be specified as a boxed dimension. The tolerance zone is two parallel planes or a cylinder at the specified angle to the datum.
WHEN TO USE IT
Use angularity when a feature must be at a specific angle other than 0° or 90° to a datum — such as angled faces, chamfers, or inclined bores. The target angle must always be defined as a basic (boxed) dimension.
COMMON MISTAKES
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Using a ± tolerance for the angle instead of a basic dimension — the angle must be basic when angularity controls it✕
Omitting the datum reference — angularity always requires a datum✕
Using angularity for 0° (use parallelism) or 90° (use perpendicularity)✕
Forgetting the ⌀ symbol when controlling an axisIS YOUR CALLOUT CORRECT?
Check these before releasing your drawing.
Is the target angle specified as a basic (boxed) dimension?
The angle must be basic when controlled by an angularity FCF. A ± angle creates a competing tolerance.
Does the FCF include at least one datum reference?
Angularity always requires a datum reference.
Is the angle something other than 0° or 90°?
Use parallelism for 0°, perpendicularity for 90°. Angularity is for all other angles.
OTHER ORIENTATION CONTROLS
Redprint checks angularity automatically
Redprint flags angularity callouts where the angle is controlled by ± instead of a basic dimension, and checks for missing datum references.