They are labeled ABEC5-608something. I dont think they are very good quality though. Brand new out of the box they have some play in them. Not side to side, but I can vary the angle of the inner ring w.r.t. the outer ring a bit by taking the bearing in one hand and holding the inner ring between thumb and finger of the other hand. Is that normal? They don't seem to have any play in axial or radial direction.
John |