Needle bearing / for aeronautics
MS21438, MS21349 series
The MS21438 and MS21349 series are ranges of type ATF and ATL aeronautical needle roller bearing from RBC Bearings. They are comprised of an inner ring, needle rollers, retaining washers, and seal or thrust washers. They also have thick outer rings which are capable of enduring heavy loads and end washers mounted to the inner ring.
The seals and bearings are located in the counterbore of the outer ring and seal against the OD of the end washers. This delivers proper retention of lubricant and prevention of penetration of foreign material. These bearings have seal/thrust washers that are made of resin material which self-lubricates and functions to separate the steel thrust surfaces to prolong the life of the lubricant and bearing.