4234840 BRG NEEDLE For HITACHI ZX130-5A 4JJ1T

The main feature of needle roller bearings is that their rollers are both thin and long, usually no more than 5mm in diameter, and the length is 3 to 10 times the diameter. This design allows the bearing to be very compact in radial structure and able to provide a large load capacity in a small space. In addition, needle roller bearings can be selected according to the use of the design with or without inner rings, bearings without inner rings directly use the journal surface and shell hole surface as the rolling surface, which requires the surface hardness and processing accuracy of the shaft or shell hole to reach a certain standard.

Needle roller bearings are a special type of roller bearings that use slender cylindrical rollers, which are characterized by thin and long rollers that can withstand higher loads despite having a smaller cross-section. Usually the length of a roller is at least four times its diameter. This bearing has a high load bearing capacity, despite its small cross section, but the radial structure is compact, especially suitable for radial mounting size limited support structures.The main function of needle roller bearings is to support and rotate rotating parts, with high load bearing capacity, suitable for radial installation size limited support structures. Needle roller bearings are usually used for rotating support of mechanical equipment, which can effectively reduce friction and wear and improve the operating efficiency and life of equipment.

There are many types of needle roller bearings, including open stamped outer ring needle roller bearings, closed stamped outer ring needle roller bearings, needle roller bearings with inner ring, needle roller bearings without inner ring, and full needle roller bearings with and without cages. These different types of bearings are suitable for different application scenarios, such as stamped outer ring needle roller bearings with thin outer ring suitable for compact designs.