Bearings are mechanical assemblies that allow machinery to carry heavy loads with efficiency and ease and move at extremely high speed in linear or rotational motion while reducing friction. Practically all applications involving moving parts utilise one or more bearings. They play a key role in almost all systems, from ceiling fans to automobiles to industrial machinery. Bearings are used even in space, where machines such as the Hubble telescope, weather satellites, and the Mars Space Rover rely on bearings during their movement to reduce friction. The great pyramids of Egypt were built with the help of ancient ball and roller bearings that allowed for the transport of massive bricks. Bearings are also used in devices we experience every day, such as fans, washing machines, microwave ovens, mechanical toothbrushes, garage door openers, and computer hard drives. Roller, ball and tapered roller bearings are usually made of chrome SAE 52100 bearing steel.
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