... rotational speed. The inner ring has no shoulder in this bearing. For this purpose, the inner ring, outer ring, ... with high rotational speed. Please check the table for bearing detail dimensions. ModelDimensions (Metric)Approx.Wgt.lbsFDBHK-030636.560 ... .010HK-0810812100.010HK-090891380.010HK-0910913100.010 drawn cup needle roller bearing NA4905,NA4907,NA4908,NA4909,NA4919 without inner rings