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The material used to make the bearing components has a great influence on the performance and reliability of the rolling bearing. General considerations for bearing rings and rolling elements include load-bearing hardness, fatigue resistance under rolling contact and lubrication conditions at different cleanliness, and dimensional stability. For cages, friction, strain and inertial forces are to be considered, and in some cases chemical interactions with certain lubricants, solvents, coolants, and refrigerants are also considered. The relative importance of these considerations is also influenced by other operating parameters. Such as corrosion, high temperature, impact load or the combined effect of these factors. Contact seals embedded in rolling bearings also have a significant influence on the performance and reliability of the bearings. The materials used in their manufacture must have excellent resistance to oxidation, heat or chemical attack. Bearing rings, rolling elements, cages and seals made of different materials to meet a variety of different needs. In addition, bearings with special coatings are used in situations where adequate lubrication can not be achieved or currents must be prevented from passing.
Cumaru is a responsibly harvested high-density hardwood species that grows throughout the northern portions of South America. Due to its beautiful graining and varied appearance, Cumaru, pronounced /Koo'-mah-Roo/, is often referred to as "Brazilian Teak".