GD&T - Form and position tolerances

Symbols per ISO 1101 / ASME Y14.5, translated into German.

Symbol	Name	Datum	Description
⏤	Straightness	-	Deviation of an edge / axis from an ideal straight line.
⏥	Flatness	-	Deviation of a surface from an ideal plane.
○	Roundness	-	Deviation of a circular line from the ideal circle.
⌭	Cylindricity	-	Combination of roundness, straightness of the axis and generator line.
⌒	Line profile	-	Deviation of a line from the target profile.
⌓	Surface profile	-	Deviation of a surface from the target profile.

Symbol	Name	Datum	Description
∥	Parallelism	yes	Position of an axis/surface parallel to the datum.
⊥	Perpendicularity	yes	Position of an axis/surface at a 90° angle to the datum.
∠	Slope	yes	Position at a defined angle ≠ 90° to the datum.

Symbol	Name	Datum	Description
⌖	position	yes	True position of a feature (possible with MMC/LMC).
◎	Concentricity	yes	Axis within the tolerance zone around the datum axis.
⌯	Symmetry	yes	Middle element lies symmetric to the datum.

Symbol	Name	Datum	Description
↗	runout	yes	Runout of a single point when rotating about the reference axis.
⌰	Total runout	yes	Runout across the entire cylindrical/face surface.

Symbol	Name	Datum	Description
Ⓜ	MMC	-	Maximum Material Condition - largest size with bonus tolerance.
Ⓛ	LMC	-	Least Material Condition - smallest size with bonus tolerance.
Ⓟ	Projected tol.	-	Tolerance zone projected beyond the workpiece.
Ⓕ	Free state	-	Measurement in the unclamped state.

Datum = tolerance is measured against a datum feature (datum). MMC/LMC modifiers allow bonus tolerance.

Note: all cutting and material values are guide values. The tool or machine manufacturer's recommendations are decisive.

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