Kind of tolerance |
Symbol |
Definition of tolerance zone |
Form tolerance |
Straightness tolerance |
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Where symbol Ø is attached before the numerical value indicating a tolerance zone, this tolerance zone is a zone in a cylinder of diameter t. |
Flatness tolerance |
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The tolerance zone is a zone held between parallel planes a distance t apart. |
Circularity tolerance |
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The tolerance zone in the considered plane is a zone between two concentric circles a distance t apart. |
Cylindricity tolerance |
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The tolerance zone is a zone contained between two coaxial cylinder surfaces a distance t apart. |
Profile tolerance of line |
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The tolerance zone is a zone held between two lines enveloping circles of diameter t, the centers of which are situated on a theoretically exact profile line. |
Profile tolerance of surface |
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The tolerance zone is a zone held between the two surfaces enveloping the spheres of diameter t, the centers of which are situated on a theorectically exact profile surface. |
Orientation tolerance |
Parellelism tolerance |
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The tolerance zone is a zone held between two parallel planes parallel to the datum plane and a distance t apart from each other. |
Perpendicularity tolerance |
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Where symbol Ø is attached before the numerical value indicating the tolerance, the tolerance zone is a zone within a cylinder of diameter t perpendicular to the datum plane. |
Location tolerance |
Positional tolerance |
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The tolerance zone is a zone within a circle or sphere of diameter t having its center at the theorectically exact location, hereinafter reffered to as the “true location”. |
Coaxiality tolerance
or
concentricity tolerance |
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Where symbol Ø is attached before the numerical value indicating the tolerance, the tolerance zone is a zone within a cylinder of diameter t whose axis agrees with the datum axial straight line. |