What does DDU 6305 DDU and other Japanese NSK bearings mean?

DDU means deep groove ball bearing. NSK 6305DDU bearing belongs to deep groove ball bearing series; It can be used in aerial work machinery, horizontal pumps, laminated glass production lines and hot melt adhesive machines.

NSK rolling bearings are generally composed of rings, rolling bodies and cages. According to the load direction, it can be divided into radial bearing and thrust bearing. According to the types of rolling elements, they can be divided into NSK ball bearings and NSK roller bearings. It can also be classified according to its shape and specific users.

Extended data:

Features of bearings:

1, contact fatigue strength

Under the action of periodic load, the contact surface of bearing is easy to be exhausted and damaged, that is, cracks and peeling appear, which is an important failure situation of bearing. Therefore, in order to improve the service life of bearings, bearing steel must have high contact fatigue strength.

2. Wear resistance

During the operation of the bearing, not only rolling friction but also sliding friction occurs between the ring, the roller and the maintenance frame, so the bearing parts are always worn. In order to increase the wear of bearing parts, maintain the stability of bearing accuracy and prolong the service life, bearing steel should have good wear resistance.

3. Difficulties

Hardness is one of the important qualities of bearing quality, which has an indirect influence on contact fatigue strength, wear resistance and elastic limit. The hardness of bearing steel should reach HRC6 1~65 under operating conditions, so that the bearing can obtain high contact fatigue strength and wear resistance.