SF - 2: boundary lubrication bearing is based on steel substrate, sintering spherical bronze powder, rolling on the surface of modified polyformaldehyde (POM), and contains a storage pit, under the condition of boundary lubrication can be use for a long time without oil.With low cost, long service life and save fuel frequency, simplify procedures, etc.Scope of application:] apply interesting conditions, the place with load in low speed, widely used in auto chassis, forging machine tools, metallurgy, mining machinery, engineering machinery, water and electricity, steel rolling industry