... could provide all kinds of ball bearing,welcome to inquiry DEEP GROOVE BALL BEARINGSDeep Groove Ball Bearing is the most commonly ... agricultural machinery and fabrics machine, etc.Characteristic of deep groove ball bearing:1. Seal form: open style, Z, ZZ, RS ... ), ceramics8. Keeper: stainless steel, PTFE, nylon9. Bearing ferrule and ball hardness: 59 - 63HRCExplanation:Z represents that one-side of the ...