•  
• Bearing model
• Model
  RNAO 20x28x13
• External diameter-(mm)
• D
  28
• Dynamic load-(kN)
• cr
  9.52
• Static load-(kN)
• cor
  14.6
• Fatigue load-(rpm)
• Fatigue load
  1.66
• Reference speed-(rpm)
• Reference speed
  20000
• Limiting speed-(rpm)
• Limiting speed
  22000
• Bearing Type
  Needle bearing

Needle bearing is a roller bearing with cylindrical rollers. The rollers are thin and long relative to their diameters. This kind of roller is called needle roller. Although it has a small section, the bearing still has a high load bearing capacity. Needle roller bearings are equipped with thin and long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, L is the roller length). Therefore, the radial structure is compact. When its inner diameter and load capacity are the same as those of other types of bearings, the outer diameter is the smallest. It is especially suitable for supporting structures with limited radial installation size. Bearing without inner ring or needle roller and cage assembly can be selected according to different applications. At this time, the journal surface and housing hole surface matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing. To ensure the same load capacity and running performance as the bearing with ring, the hardness, machining accuracy and surface quality of the raceway surface of the shaft or housing hole should be similar to the raceway of the bearing ring. This type of bearing can only bear radial load.