... , high quality, low price 2. ISO9001:2000 3. OEM 2012! deep groove ball bearing 6228 (high precision)1.high precision,Long life 2. most ... -6220, 6300-6320, 6403-6413.3) Material: Gcr15(chrome steel)-China, (AISI)52100-American, (Din)100Cr6-Germany, carbon steel, iron.4 ... famous brand(SKF, NSK, FAG, TIMKEN, IKO, KOYO etc.) 2012! deep groove ball bearing 6228(high precision)