Perpendicularity is the condition of a surface or axis at a right angle to a datum plane or axis.
1. A zone defined by 2 parallel planes perpendicular to a datum plane or axis. In the example shown, the surface of the feature must lie within this zone which is 0.15mm wide and at right angles to datum A.
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2. A zone defined by 2 parallel planes perpendicular to the datum axis. In this example, the axis of the hole must lie within the zone which is 0.3mm wide and at right angles to datum axis A. The feature axis must also be within the tolerance of location.
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3. A cylindrical tolerance zone perpendicular to a datum plane. In this example the axis of the part must lie within a cylindrical zone of 0.05mm diameter at right angles to datum A.
This tolerance applies at the maximum diameter of 14.984mm (MMC). As the feature size decreases from MMC, the perpendicularity tolerance zone is increased a corresponding amount. The feature axis must also be within the tolerance of location.
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4. A zone defined by 2 parallel lines perpendicular to a datum plane or axis. In the example shown, each radial element of the surface must lie within this zone 0.05mm wide and at right angles to datum A.
The surface must also be within the specified limits of size.
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