Linear bearings, manufactured with low cost, are used in limitless journey or used to work in column.As loading ball contacts the shaft at certain point, the bearing application loading capacity is quite small. With rotation of ball with a quite slight friction resistance, high-precise level movement can be obtained. Linear bearings are widely used in precise equipments such as electronic equipment, pull measuring machine,numeralization 3-D measuring equipment, etc; and slip part of industrial machines such as multi-shaft machine, punching machine, tool grinder, auto steam cutting machine, printer, card selection machine, food packing machine and so on.