Diameter Dimension

A Diameter Dimension labels the diameter of a circular feature — piles, drilled shafts, anchor bolts, dowels, casings, circular openings, round columns. Use diameter for closed circular features; use Radius Dimension for arcs and curved edges.

Pick the circle, and the dimension shows the diameter with a leader.

Text and units

Label: Override text. Leave blank to use the auto-computed diameter.

Prefix: Text before the value. Default ⌀ (the conventional diameter symbol).

Suffix: Text after the value.

Precision: Number of decimal places.

Unit Style / Length Unit: Units for the diameter value.

Placement

Center X / Center Y: Override the leader's pivot point. Default uses the dimensioned circle's center.

Typography

Text Height: Text size in real units.

Font Family / Font Weight / Font Style: Font controls.

Notes

For piles and drilled shafts, the standard convention is ⌀ <size> (e.g., ⌀ 24"). For anchor bolts and dowels, the standard is also diameter, often combined with a length and quantity in a separate note (e.g., (4) ⌀ 1" × 18" anchor bolts).

When dimensioning many identical circles (a pile group, a bolt pattern), call out one and add a note describing the rest, rather than placing one diameter dimension per circle.