Symbols For Geometric Tolerance

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The followings are the normal symbols for geometric tolerance shown on the drawings of iron and steel castings. We just briefly introduce their meanings, and hope they could be useful for buyers and suppliers to better understand the drawings.

Straight straightness, indicating the tolerance for straightness to one edge or to one line.

Flat flatness, indicating the flatness to one surface. Higher flat will mean the surface must be very flat. Usually this tolerance is for the rough surface of metal castings.

Round ovality, indicating how round for one round surface. If round tolerance is high, then it will mean the ellipse and irregular circle will not be allowable.

Cylinder it is for the tolerance to the cylinder, which is similar with the round, but just for the how cylinder, not just for one circle.

Circle Runout this is one simple tolerance for indicating the tolerance when round part rotates by one standard axle. High circle runout means the part needs to rotate perfectly by the standard axle.

Total Runout this is the higher tolerance for indicating the tolerance when round part rotates by one standard axle. It is hard to explain by English, but it will mean this part needs to rotate perfectly.

Perpendicular this indicates two lines or two surfaces need to be vertical.

Parallel it means two lines or two surfaces should be paralleled.

True Position it means how far for one axle line or center position to deviate their theoretical positions.

Concentric it means how the axles of two circles deviate each other.

Profile of Surface it means the real surface deviate the theoretical surface.

Profile of Line it means the line deviate the theoretical line.

Angle it means the allowable angle tolerance.

Diameter it means the max. dimensional tolerance for one diameter.

Radius it means the max. radius deviation.

Datum reference, standard, or reference face, standard face.




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