Bushings can be classified as stationary press fit bushings and renewable (loose) bushings. The term "fixed bushings" for press fit bushings is not recommended, because it is used with a different meaning in the text of the USA Standard. By shape they can be classified as headless and head type bushings; by use, as liner and renewable wearing bushings. By basic design they are classified as conventional and special bushings. Conventional bushings are classified as standard and nonstandard bushings, depending on individual dimensions