JNS NA4901UU Machined Ring Type Sealed Needle Roller Bearing With Inner Ring, 12mm bore x 24mm outside diameter x 13mm width. Equivalent to IKO NA4901UU, INA NA4901.2RS, NTN NA4901LL, Torrington - Koyo NA4901.2RS.
Machined type needle roller bearings are high precision bearings which consist of machined outer ring with a complement of needle rollers retained and guided by a cage. The bearings feature a smaller cross-section, higher load-carrying capacity, greater rigidity. Therefore, they are useful in making machinery smaller and lighter.
JNS Needle Bearing Crossover Chart