... life 3) 20 years manufacturer. 4) ISO9001:2000 .. Roller bearing :1) used in machine tools ,heavy-duty equipment , ... originShandong,ChinaTypeLarge-size bearing ,taper roller bearing, spherical roller bearing , cylindrical roller bearing, Roller slewing bearing, thrust roller bearing,heavy duty bearing,Machine-tool bearing,Construction bearing ,Auto bearing ,Engine bearing,needle rollerID Size20 ...