213xx Spherical roller bearings
Description
The 21300 series self-aligning cylindrical roller bearings are the self-aligning version of the 30300 series tapered roller bearings. We use them when the bearing has to bear a large axial and radial load, and the angular deviation in the drive must also be corrected. The bearing has a five-digit identification number, the first three digits of which are "213". The last pair of digits can range from 00 (in theory) to 99 and shows the nominal diameter (shaft size) of the bearing's inner ring. The 21300 series barrel roller bearings can also be made with a tapered (1:12) inner ring.
Other features of the 21300 series bearings are identified by signs or suffixes. The most common pre/postmarks for 21300 series bearings are: SS=stainless material, MB=machined bronze basket, CC=pressed steel basket, K=tapered (1:12) inner ring, W33=lubrication groove and holes on outer ring. You can find more information in the catalogs by clicking on the DOWNLOADABLE DOCUMENTS tab.