Needle roller bearings are roller bearings with cylindrical rollers that are relatively thin and long compared to their diameter. These rollers are called needle rollers. Despite having a smaller cross-section, the bearings still have 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 length of the roller), so the radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, making them particularly suitable for support structures where the radial installation size is limited.
