AngularityAngularity toleranceallows the designer to specify the degree to which the orientation of an angled part featuremay vary. The angularity symbol is often usedto insure that the part can properly mate with another.Rule: "This axis must lie within two planes 0.5 apart, the planes inclined 60 to surface A".

PerpendicularityPerpendicularity toleranceallows the designer to specify the degree to which the orientationof a right-angled partfeaturemay vary. The perpendicularity symbol is often used on a drawing to ensure that mating features can be assembled. In most cases, the perpendicularity symbol is applied to afeature-of-size (FOS)with its base dimension. The tolerance zone is created perpendicular to the specified datum,anda part feature,axis, or center plane must lie within it. Rule: "This axis must lie between two planesperpendicular tothe surface at A and spaced 0.1 apart".

Cylindricity Cylindricity toleranceis used when cylindrical partfeaturesmust have goodcircularityandstraightness, like pins or camshafts. While circularity applies only to cross sections, cylindricity applies simultaneously to the entire surface. Since cylindricity is applied to an individual surface, this tolerance does not need to be related to adatum.Rule: "This surface must lie between two concentric cylinders spaced 0.2 apart"

RunoutRunout toleranceis used to control the location of a circular partfeaturerelative to itsaxis. This is different thancircularity, which controls overall roundness. Runout is usually applied to parts with circular cross sections that must be assembled like drill bits, segmented shafts, or machine tool components. Runout helps to limit the axis offset of two parts to ensure they can spin and wear evenly.Rule: "Each circular element of this surface must havefull indicator movement (FIM)of less than 0.1 relative todatumA".

Total RunoutTotal runoutis a complex tolerance that controls afeature'sstraightness, profile,angularity, and other geometric variation. Total runout is different thanrunoutbecause it applies to an entire surface simultaneously instead of individual circular elements.Rule: "This entire surface must havefull indicator movement (FIM)of less than 0.1 relative todatumA".

ParallelismParallelism toleranceallows the designer to specify the degree to which afeature's orientation may vary with respect to its referenceddatumby creating a tolerancezone parallel to that datumRule: "This axis must lie between two planesparallel tothe axis A and spaced 0.3 apart

PositionPositionis a versatile tolerance that can be used to control location, coaxiality, orientation oraxis offset of a partfeatureoraxis. Position tolerance is generally applied to features important to assembly like holes or slots, and it is often included when performing atolerance stack.Rule: "Relative to datumsA, B, and C, the position of these hole centers shall lie within a cylindrical tolerance zone of diameter 0.3".

StraightnessStraightness tolerancespecifies a tolerance zone within which the line element of a feature must lie. Since straightness is applied to an individual feature, this tolerance does not need to be related to adatum.Rule: The top and bottomof the cylindermust lie between two parallel planes 0.02 apart".

ConcentricityConcentricityis a complex tolerance used to establish a tolerance zone for themedian pointsof a cylindrical or spherical partfeature. Concentricity is generally reserved for high-precision parts, and only when there is a need to control median points.Rule: "Relative todatumA, all median points of opposing elements on this cylindrical surface must lie within a cylindrical tolerance zone of 0.5"

FlatnessFlatness tolerancedefines a zone between two parallel planes within which a surface must lie. Since flatness is applied to an individual surface, this tolerance does not need to be related to adatum. Flatness is usuallyused on a surface associated with a size dimension, acting as a refinement to the size requirement to ensure proper function of a part, or to promote even wear. Flatness tolerance applies in all drawing views, not just the view showing the tolerance callout.Rule: "This surface must lie between two parallel planes spaced 0.2 apart in all views."

SymmetrySymmetrytolerance establishes a tolerance zone for themedian pointsof non-cylindrical partfeatures. This tolerance is similar toconcentricity, and the verification of symmetry tolerance is likewise time-consuming and difficult. It is generally recommended thatposition,parallelism, orstraightnessbe used in lieu of symmetry tolerance.Rule: "The median points of these opposing surfaces must be symmetric aboutdatumaxisA within a tolerance zone of 0.7"

CircularityCircularity toleranceis used to control the roundness of circular parts orfeatures. Some examples of circular features include cylinders, spheres, and cones. Sometimes circular surfaces are usedfor moving partssuch as ball bearings or spools, inwhich case circularityhelps ensure theseparts move smoothly andwear evenly. Because circularity is applied to an individual surface, this tolerance does not need to be related to adatum.Rule: "each circular cross section of this cylinder must lie between two concentric circles spaced 0.25 apart"