Miniature Bearing as a special deep groove ball bearing be listed seperatly:

Metric series: 60**,62**,63**,67**,68**,69**,.And MR115**,MR117 **,MR74**,MR52 **

Inch  R series: R144**,R166**,R188**,R2**,R6 **,R1970**, R2480**,SR4**, L-1150**, L-1470**,L-1790 **ect

Metric or Inch size with flange: MF74**, MF126**,MF83 **, F696**, F693**, FR3**,FR1-5**ect.

Tolerance : There are ABEC-1.ABEC-3.ABEC-5.ABEC-7 or P0.P6.P5.

And specifications of vibration(acceleration) or (velocity). Z1.Z2.Z3.Z4.V1.V2.V3.V4 ect.

Types:  no shields Open type, with two sheilds ZZ. 2RS.VV Or with one shield Z.. RS.V. OPN, OPNR,ZZN,ZZNR with stop-cut and rings.

In the deep groove ball bearings ,also have some special cage:
M (Brass cage).  W( steel cage) . TN(plastic cage).  V (no cage)