Tapered roller bearings can be separated from the inner ring with roller cage components together and the outer ring can be installed separately. As amended by the roller and raceway contact at the contact line can reduce the stress concentration. The tapered roller bearing can withstand large radial and axial load. Tapered roller bearings can only pass one-way axial load, axial load in the opposite direction to pass on another with symmetrical installation of tapered roller bearings. The tapered roller bearings, the largest amount of single row tapered roller bearings. In the front wheels of cars in recent years, using the small size of the double row tapered roller bearings. Four tapered roller bearings used in a large cold and hot rolling mill and other heavy machinery Bore size:17 mm Outside diameter:40 mm Model number:30203 Precision rating:p0, p6, p5, p4, p3 z1, z2, z3, z4 Seals type:open Number of row:single row