RNA4908 bearing is Precision Needle Roller Bearing, Machined Type, Without Inner Ring, Steel Cage, Open End, Oil Hole
Sizes: ID 48mm x OD 62mm x L 22mm
Match#: RNA4908X, RNA4908J, RNA-4908
This RNA4908 precision radial needle roller bearing has a steel cage and an oil hole, and is suitable for applications with high dynamic and static loads. RNA-4908 It has a reduced cross-section (without an inner ring) for use in restricted mounting spaces. The RNA4908 steel cage provides guidance and even spacing of the rollers for minimum vibration and noise when operated at high speeds, and the outer ring has a lubrication groove and an oil hole for applying lubrication in place. The needle rollers are made of through-hardened, high-carbon chromium steel for durability and heat tolerance, and have contoured ends to optimize the distribution of contact stress. This radial needle roller bearing meets Deutsches Institut für Normung standard DIN 617 and International Organization for Standardization standard ISO 1206 for quality assurance, and is used in various applications, such as automotive and truck transmissions, agricultural and construction equipment, pumps and compressors, and two-cycle engines, among others.
Roller bearings use rolling elements to maintain a separation between moving parts to reduce rotational friction and support radial and axial loads. These elements can be one of the following types: ball, cylindrical, spherical, barrel, needle, spindle, or tapered. Roller bearings can be open on both ends (a shaft can pass through) or open on one end and closed on the other. An open end can be sealed or shielded to protect the bearing from solid contaminants and moisture that could reduce its lifespan. If an end is sealed, the sealing component is an elastomer lip that contacts the shaft. If it is shielded, the shielding is a non-contact lip, usually made of metal. Rolling bearings are used in a range of applications from agricultural machinery to conveying equipment, robotics, dental equipment, elevators, rolling mills, ship rudder shafts, and aggregate crushers, among others.
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