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A plain circle inside a tolerance frame.
Also known as: Roundness symbol, Out-of-round tolerance
A circle in a tolerance frame limits how far a cross-section may depart from a true circle. It says nothing about the diameter, which is controlled separately: a shaft can be perfectly round and entirely the wrong size.
Limits the deviation of a circular cross-section from a true circle.
Contexts: Technical drawing
Controls form and not size: a feature can satisfy a circularity tolerance and still be outside its diameter limits.
Contexts: Technical drawing
A plain circle drawn in the left compartment of a rectangular frame.