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A parallelogram, specifying how flat a surface must be.
Also known as: Flatness, Leaning rectangle, Parallelogram drawing symbol
A leaning parallelogram means flatness. It requires the surface to lie between two parallel planes a stated distance apart, and it needs no datum because flatness is a property of the surface alone.
Requires every point of a surface to lie between two parallel planes separated by the stated tolerance.
Contexts: Technical drawing
Needs no datum reference, because flatness is a property of the surface in itself rather than a relationship to anything else.
Contexts: Technical drawing
A parallelogram with horizontal top and bottom edges and sides slanting to the right, drawn inside the leftmost cell of a tolerance frame.
Geometric characteristic symbols placed in a tolerance frame.