Bearings are mechanical devices used to assist machinery in linear and rotational movement, friction reduction, and load support. They produce less friction than a sliding surface, and therefore enable the systems to which they are affixed to operate faster and more efficiently. Bearings are in use throughout the aerospace, civil aviation, defense, and marine sectors. Though bearings are simple parts, their importance cannot be overstated. The most commonly found bearings in the aerospace and defense industries are roller bearings, ball bearings, ball thrust bearings, screw bearings, baffle bearings, actuator bearings, and needle bearings.