UK 212 ASAHI is an insert ball bearing with a 1:12 tapered bore. Its outside diameter is 110 mm and inner-ring width 36 mm; it locks onto the shaft through a suitable adapter sleeve.
UC 206 G2 SNR is an insert ball bearing for a 30 mm shaft, with a spherical outside surface of 62 mm diameter. Set screws secure it to the shaft; the seal is supplemented by a slinger.