... ball bearing 6228 (high precision)1.high precision,Long life 2. most competitive price 3.OEM-SKF,NSK,FAG, TIMKEN, KOYO etc.4.best after-saleProduct:1. product range of use: these bearings ... , 6403-6413.3) Material: Gcr15(chrome steel)-China, (AISI)52100-American, (Din)100Cr6-Germany, carbon steel, iron.4) Shield/Closure: Plain(open), Z ...