The nature of CVD coating compounds being formed by reactive gases flowing at high temperature provides a uniform homogeneous coating being deposited on all surfaces including internal diameters. PVD coatings are “line of sight” and are deposited on the surfaces of the components that are presented to the coating target plasma. PVD coating process technology uses mechanical part rotation ranging from single axis to triple axis rotation in order to achieve coating on multiple surfaces. The general rule of thumb for PVD coating of I.D. surfaces is a coating depth of 1X the internal diameter will be achieved. This factor becomes less as the I.D. becomes smaller than .500.