Which type of tolerance governs the tilt of features like parallelism and perpendicularity?

Orientation tolerance specifically governs the tilt of features such as parallelism and perpendicularity. This type of tolerance is critical in ensuring that parts fit together properly and function as intended within mechanical assemblies.

When we discuss orientation tolerances, we refer to the geometric control of the direction of a feature in relation to a datum or other features. This means that when a feature is specified to be perpendicular to a reference surface, for example, it must meet tight criteria to adhere to that requirement. The specifications help in maintaining the desired angles and alignments necessary for the effective functioning of parts.

Form tolerance relates to the shape of individual features, ensuring they conform to specified limits, but does not address their orientation. Profile tolerance defines a surface contour and also does not provide direct control over the tilt of features. General tolerance covers a broader range of permissible variations without delving into specific relations such as parallelism or perpendicularity. Thus, orientation tolerance is the category that directly addresses the alignment and angle requirements needed for proper mechanical function.