Standard type is used in end supported applications, where spanning or bridging a gap is required. They have the greatest range of industrial application. However, care must be taken to select a shaft diameter to minimizes deflection. Precisely ground bearing track and plastic retainers provide smooth and quiet performance.

Seals at both ends keep out contaminants and retain lubrication giving maximum travel life.

The outer circumference of linear bearing is a cylindrical shape with highest accuracy, and to use is possible over a wide range of applications.

Type LM-UU: This is the metric dimension series with seal used most frequently in Korea and Japan.
Type KB-UU: This is the metric dimension series with seal used most frequently in Europe.
Type SW-UU: This is the inch dimension series with seal used most frequently in USA. 

Here is the technical specification of LM LINEAR BEARINGS as below.
LM3/LM4/LM5/LM6UU/LM8UU/LM8SUU/LM10UU/LM12UU/LM13UU/LM16UU/LM20UU/LM25UU/LM30UU/LM35UU/LM40UU/LM50UU/LM60UU/LM80UU