Deep groove ball bearings, 37 diameter, 20 diameter, what type of bearings?

Deep groove ball bearings, 37 diameter, 20 diameter, what type of bearings?

Deep groove ball bearings, outer diameter 37, inner diameter 20 bearing type is 6904 (61904), 6904ZZ (61904ZZ), 6904-2RS (61904-2RS),Inside diameter: 20mmOutside diameter: 37mmThickness: 9mmDynamic load: 6370nStatic load 3650nLimit speed: 18000 r/minWeight: 0.04 kg

It is estimated that the non-standard bearings6004 bearing outer diameter 426204, bearing outer diameter 476304, bearing outer diameter 52

Bearing 61804, inner diameter 37, outer diameter 20, width 3. 30 does not exist.Bearing: bearing bearing, used to determine the relative position of the rotating shaft with other parts, and to support or guide the parts. Its main function is to support the mechanical rotating body, in order to reduce the equipment in the transmission process of mechanical load, friction coefficient. According to the friction properties of moving elements, the bearings can be divided into two types: rolling bearings and sliding bearings. Radial bearings, thrust bearings, liquid lubricated bearings, imperfect liquid lubricated bearings, and non lubricated bearings. Self-aligning ball bearings, spherical roller bearings, tapered roller bearings, double row deep groove ball bearings, thrust ball bearing, deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, needle roller bearings.