Concentricity

Concentricity controls how closely the derived median axis of a round feature aligns with a datum axis. Use it when coaxial alignment matters for rotating parts, nested diameters, precision bores, or shafts where mass distribution around a common axis is important.

Faces Or Edges

Select the round face or circular edge whose median axis should be controlled. Choose the geometry that represents the manufactured feature being inspected.

Tolerance

Set the diameter of the cylindrical tolerance zone in the current unit system.

Datums

Add the datum label or labels that define the reference axis. Concentricity requires at least one datum reference.

Precision

Choose how many decimal places to display for the tolerance value.

Frame Position

Place the feature control frame near the controlled round feature while keeping it clear of other callouts.

Frame Plane

Choose the display plane for the annotation. Use the plane that keeps the frame legible in the inspection or documentation view.

Leader Scale

Adjust the visual scale of the leader dot.

Font Size

Set the model-space height of the annotation text.

Are you interested in code?

Zoo Design Studio writes KCL behind the scenes. A Concentricity annotation uses gdt::concentricity with selected faces or edges, a tolerance, and datum references.

Want to find out more about the gdt::concentricity function? Check it out in our KCL docs.