Because cylindrical features represent features of size, orientation tolerances are applied on an LMC basis.

Orientation tolerances, such as perpendicularity, angularity, and parallelism, can be applied to features of size, including cylindrical features, but they are not exclusively applied on an LMC (Least Material Condition) basis. They can also be applied on a basis of MMC (Maximum Material Condition) or regardless of feature size (RFS), depending on the functional requirements of the part.