Post code for k, K30, spherical roller bearings with tapered bore, installed on adapter sleeve to match, has become the post code for K+H and K30+H type bearings. 

Such bearings can be mounted where there is no shoulder on the optical axis, for applications that require frequent mounting and dismounting bearings are. In order to improve the lubrication of bearings, bearing outer ring oil bath and drill three holes with uniform distribution, then reset code W33.