... But, it has certain influence to the bearing life.The deep groove ball bearing can be widely used in automobile, tractor ... pump, agricultural machinery and fabrics machine, etc.Characteristic of deep groove ball bearing:1. Seal form: open style, Z, ZZ, ... stainless steel, PTFE, nylon9. Bearing ferrule and ball hardness: 59 - 63HRCExplanation:Z represents that one-side of the deep groove ball bearing is ...