Bearing No. Boundary Dimensions(mm) d D B S C ds UC203 17 40 27.4 11.5 14 M5 x 0.5 UC204 20 47 31.0 12.7 17 M6 x 0.75 UC205 25 52 34.1 14.3 17 M6 x 0.75 UC206 30 62 38.1 15.9 19 M6 x 0.75 UC207 35 72 42.9 17.5 20 M8 x 1 UC208 40 80 49.2 19.0 21 M8 x 1 UC209 45 85 49.2 19.0 22 M8 x 1 UC210 50 90 51.6 19.0 24 M10 x 1 USA001RS 12 28 11 4 8 USB001RS 12 28 15 5 8 M3 x 0.35 USC001RS 12 28 8 CS203DDU 17 40 12