Deep groove ball bearings are divided into four basic series: 60, 62, 63, and 64. In addition, there are 2 thin-walled 618 (68 for short), 619 (69 for short) series, and a 160 series
The inner diameter code is expressed as follows: (the letter d represents the inner diameter, and the size is in millimeters)
d<10 is directly expressed by the nominal inner diameter
The inner diameter code of d=10 is 00, the code of d=12 is 01, the code of d=15 is 02, and the code of d=17 is 03
17 < d < 500 (except 22, 28, 32) The quotient of the inner diameter divided by 5 is the code
For example, 6012 bearing, 6 represents deep groove ball bearing, 0 represents 60 series, 12 represents inner diameter
22310 (old model was 3610). 22 represents the spherical roller bearing, 3 represents the 223 series (and 222 series, etc.) 10 represents the inner diameter is 10
For example, in the 689ZZ bearing, 6 represents the deep groove ball bearing, 8 represents which series (618 series), 9 represents the inner diameter of 9 mm, and ZZ represents the iron cover seal.
