F4-9 Thrust Ball Bearings are applied to machine elements which bear single side axial load and with the lower the mechanical speed, such as crane hooks, immediately water pumps.
51204 Thrust roller bearings are mainly used for heavy-duty machine tools, power marine gear boxes, oil rig, electrical and other machinery in the vertical.
51130 Thrust ball bearing is made up of housing ring, axis ring and steel ball maintains module. Which is match for axis is called axis ring, which is match for shell is called housing ring