... could provide all kinds of ball bearing,welcome to inquiry DEEP GROOVE BALL BEARINGSDeep Groove Ball Bearing is the most commonly ... , water pump, agricultural machinery and fabrics machine, etc.Characteristic of deep groove ball bearing:1. Seal form: open style, Z, ZZ ... hardness: 59 - 63HRCExplanation:Z represents that one-side of the deep groove ball bearing is mental dust cover, and ZZ represents ...