cylinderical roller bearings single-row cylinderical roller bearing single-row large size cylindrical roller bearings can be divided into four types:N、NU、NJ、NUPd=180mm-950mm D=280mm-1250mm B=46mm-224mmdouble-row cylinderical roller bearing double-row large size cylindrical roller bearings can be divided into two types:NN、NNUd=260mm-670mm D=400mm-980mm B=104mm-280mmfour-row cylinderical roller bearing d=320mm-950mm D=480mm-1300mm B=290mm-850mm
