RB series(THK corresponding to RB series,IKO corresponding to CRB series),NSK corresponding to NRXT series) Cross-roller beaing basic type,the dimension of inner ring and outering are minimum limited, with a separable outer ring which fixed together by bolt or special rivet, The inner ring is integrated. It is used in locations where the rotational accuracy of the inner ring is required. For example,the swivel portions of index tables of machine tools.