The life span and proper functionality of machine completely relies on the quality of bearings. The major role of bearing is to provide the frictionless shifts and movement between the parts of the machine. And hence it is made up of silicon nitride and stainless steel. Typically the coating regarding titanium carbide makes the bearing to spin in all selection of speed without any complication. Stainless steel resists the physical body of the bearings from all kind of environmental changes. Pacamor Kubar Bearings, ABI Industries, Schaeffler Group UNITED STATES OF AMERICA, Pacific International Shuster and Bearing Corp are legendaries in manufacturing bearings. In all rotary devices the contribution of ball bearing is very important for a safety and durability. Hybrid elements and ceramic are used for making of high quality ball bearings. Radial and thrust are two types of ball bearings whereas generally these are ring shaped. Ball bearings used in aerospace application like turbine and transmission. It designed in such a way to endure combination loads and reversible thrust. The whole fat of plane gets verwandlung from airframe to the place only through the landing wheels in endure extreme high temperature is generated and accelerates from 0 to 2000 RPM. So both it is tiny airplane or even commercial jet tapered roller bearings usually are implemented within wheels to create a safe bringing. Tapered roller bearings is probably the aerospace bearings there are few more different design are in can be found for several aspects of aircraft. Cylindrical roller bearings are mainly used in gearbox and turbine engine. It controls the function over extended range of speed. Needle Roller Bearings are used for the purpose of moderating the velocity in application of high basket full within smaller space. It implemented in landing airframe and system of aerospace and in helicopter rotor blades. Spherical roller bearings prefer moderate the capability of thrust load and in addition combine the capability of radiado load. Precision ball bearings are not only used in aerospace but also in all general industry like machine tool, health, and even robotics. These super precision ball bearings are manufactured to tolerance category operations. It fits the requirements like machine uptime, rigidity, high speed and accuracy. The main putting on this bearing is in milling spindles, milling spindles, boring spindles, acceleration routing, vertical or horizontal spindles. It capabilities either 12-15 or twenty five degree angels in thrust and radial combination. In the case of bearing repairs and maintenance, there are few things to carefully be noted. Earliest and connaissance most is the quality for the component and certainly it is not safe to use inferior bearing inside high heat generating machines. Design and style would be the up coming consideration, obviously there are highly sophisticated designs are available to fit the different demands of aircrafts and machines. And first of all the density of reduction in friction is very important to the proper maintenance of bearings.