Needle bearings represent a variant of cylindrical roller bearings, in which the roller length is at least six times its diameter. As far as the structure, size and variety of types as well as application possibilities are concerned  they represent unquestionably  the  largest group of  rolling bearings. Each variant has individual features, but generally needle bearings demonstrate high load capacity at relatively small sizes. It helps obtain a compact bearing-closed pairs construction,  and  wide  variety  of  sizes  and  types  makes  it possible for designers to use new technological solutions. The contact line of tracks and needles is modified (needles are profiled on their ends), what not only eliminates harmful end  stresses but also enables minimal misalignment between  the  shaft  and  the  bearing mounting. Bearings  are equipped with steel cages or cages made of steel sheet. In smaller-sized bearings cages made of polyamide strengthened with glass fiber are also in use.