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           A linear-motion bearing or linear slide is a bearing designed to provide free motion in one dimension. There are many different types of linear motion bearings and this family of products is generally broken down into two sub-categories: rolling-element and plane.

            Linear-motion bearings deal with the problem of providing low-friction translational (rather than rotational) motion. Sliding-surface bearings are stiffer and deflect less under load than rolling-element types, and sliding-surface bearings allow greater load capacity per unit of surface area. But they also exhibit appreciable stick-slip, or a sudden surge of "breaking loose" when motion begins. Stick-slip results from a large difference between static and kinetic friction. Hydrostatic bearings do not have stick-slip, but they are complex and expensive.

            Linear Motion Rolling Guides are used with satisfactory results for various applications requiring precision positioning such as semi-conductor manufacturing  equipment and large-sized machine tools. In contrast to conventional rolling bearings used in rotating parts, Linear Motion Rolling Guides are the products applicable to plane sliding surfaces, and meet the increasing needs for linear motion and precision  positioning in machines and equipment. Linear Way and Linear Roller Way of rail  guide type, Linear Ball Spline of shaft guide type, and other products, recognized for  their high quality and excellent features, are available. 

            Rolling-element linear bearings are simple and inexpensive and do not exhibit significant stick-slip because their static and kinetic friction is nearly the same. (Coefficients range from about 0.002 to 0.005.) These bearings, therefore, are preferred for precision machinery. They require less power to put a machine in motion. This factor is especially important in servo control where cost increases greatly as power requirements increase.

            Linear bearings are of two types. Flat-way bearings are designed to bear against flat surfaces. Shaft bearings are designed to ride along a round shaft.


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