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The needle bearing is roller bearing with a cylindrical roller, which is both thin and long with respect to its diameter. In spite of the smaller cross-section, the bearing still has a high load bearing capacity. The needle bearing is equipped with thin and long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, L means the length of the roller), therefore its radial structure is compact. When the inner diameter size and load capacity are the same as those of other types, the outer diameter is the smallest, which is particularly suitable for a support structure in which the radial installation size is limited. Structure type This type of bearing has a radial needle and thrust full of ball, or with a thrust ball, or with a thrust cylindrical roller, or with the angular contact ball into one, can withstand unidirectional or two-way axial load. Can also be designed according to the user's specific structural requirements. Materials Needle roller material for the GCr15 bearing steel, hardened HRC60-65. Inside and outside the ring material for the GCr15 bearing steel, hardened HRC61-65. The cage material is made of high quality mild steel or reinforced nylon. Application It is widely used in machine tools, metallurgical machinery, textile machinery and printing machinery and other machinery and equipment, and mechanical design can be more compact and smart.