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A KOYO by JTEKT Bore Dia- 64 mm Needle Roller Bearing 64BTM7321A is a type of rolling element bearing that utilises cylindrical rollers with a small diameter compared to their length. These rollers are commonly referred to as needle rollers. Needle roller bearings accommodate high radial loads while maintaining a small cross-sectional profile. Key features and components of a needle roller bearing include: Outer Ring: The outer ring of a needle roller bearing provides support and protection for the bearing assembly. It typically has a hardened surface to enhance durability and load-carrying capacity. Inner Ring: The inner ring is used to provide a mating surface for the needle rollers. It is typically designed to have a close fit with the shaft. Needle Rollers: Needle rollers are the primary load-carrying elements in a needle roller bearing. They have a cylindrical shape with a small diameter compared to their length. The inner and outer rings typically guide the rollers to ensure proper alignment. Cage: The cage holds and separates the needle rollers, ensuring uniform spacing and guiding their movement within the bearing. It also prevents the needle rollers from contacting each other, reducing friction and wear. Lubrication: Needle roller bearings require lubrication to reduce friction and prevent premature wear. Depending on the specific application requirements, lubrication can be provided through various methods, such as oil or grease. Needle roller bearings are commonly used in various applications, including automotive components, industrial machinery, transmissions, and agricultural equipment. They are chosen when there is a need for a compact design and high load-carrying capacity.

7321 Bearing Size