A rectangular box divided into cells, stating a geometric characteristic and its tolerance.
Also known as: Feature control frame, GD&T box, Divided rectangle drawing
A divided box states a geometric requirement: what characteristic is controlled, within what tolerance, relative to which datum. It controls the shape of a feature rather than its size, which a plain dimension cannot do.
States a geometric characteristic, the tolerance permitted on it, and the datums it is measured from, in that order across its cells.
Contexts: Technical drawing
Controls the form and orientation of a feature rather than its size, which plain dimensions cannot do — a hole can be the right diameter everywhere and still not be round.
Contexts: Technical drawing
Is governed by ISO 1101 internationally and ASME Y14.5 in the United States. The two systems overlap heavily and differ in detail, so which one applies is stated on the drawing.
Contexts: Technical drawing
A horizontal rectangle divided by vertical lines into two or more cells, the leftmost holding a geometric symbol and the others a tolerance value and datum letters.
The leftmost cell holds the characteristic symbol.
A tolerance frame usually references datums the datum symbols establish.