We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A circle or a double circle on a leader, extending a callout.
Also known as: All around marking, All over symbol
A circle on the elbow of a leader extends a profile tolerance around the whole outline in that view; a double circle extends it over the entire surface of the part in three dimensions. One mark distinguishes a two-dimensional outline from a whole solid.
Extend a profile tolerance around a complete outline in the view shown, drawn as a circle at the leader's elbow.
Contexts: Technical drawing
Extend it over the whole three-dimensional surface of the part when drawn as two concentric circles, which is a materially larger requirement.
Contexts: Technical drawing
One small circle, or two concentric circles, drawn at the bend where a leader meets a tolerance frame.