YAR 2, YET 2 and YEL 2 series conform to ISO 9628:1992
17262(00)-2RS1 and 17263(00)-2RS1 series correspond with those of deep groove ball bearings in the 62 and 63 series and are in accordance with ISO 15:1998; except that the bearings have a sphered outer surface
YSA 2 K series conform to standard JIS 1558-1995
YAT 2 series are not standardized, but common on the market
YHB 2, YHC 2 and YQC 2 series are not standardized, but common on the market.