With thin and long needle bearing roller (roller diameter D≤5mm, L / D≥2.5, L is the length of the roller), so radial structure is compact, its diameter size and load capacity with other types of bearings are the same , minimum diameter, especially for radial bearing mounting dimensions restricted results. Depending on different occasions, high-speed linear bearings, can be used without an inner ring of the bearing or needle roller and cage assemblies, then the journal surface and the surface of the bearing shell holes match directly as the bearing, the outer rolling surface, to ensure the load capacity and operating performance and have the same linear bearing slide bearing rings, shaft or housing bore raceway surface hardness, machining accuracy and surface quality should be similar bearing ring raceway. Such needle roller bearings can only bear radial load. Rolling guide for a linear guide. Linear guide is generally two kinds, one is rolling linear bearings, one is sliding axis linear bearings, linear rolling guide rails is a scroll, which consists of ball between the slider and rails for infinite scrolling loop , so that the load platform can be easily made with high precision linear movement along the rail, the friction coefficient can be reduced to 1/50 of the conventional slide guide, so that it can easily reach the μm-level positioning accuracy. Rolling guide is placed ball, roller, needle and other rolling elements between the rail surface, the sliding friction between the rail surface becomes rolling friction. [Linear bearing axis, Shanghai linear bearings, bearing the best quality provided by Cheng Feng Cheng Feng Bearing Co., Ltd. Lishui City. Cheng Feng Bearing Co., Ltd. Lishui City (susan1125.b2b.hc360.com/) strong, credible, in Jinhua, Zhejiang sliding bearings industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the way into the abundance of brilliant bearings and you work for a better future!