... ABEC-3 ABEC-5 3.ISO 9001:2008 4.Mold:OPEN,Z,ZZ,RZ,2RZ,RS,2RS SeriesItem NO.Bore Diameter ... serieses including the Standard Type, Clearance Adjustment type and Open type. For example: LM8UU -------Standard type LM8UU-AJ----Clearance Adjustment type LM8UU-OP---Open type3,In the ...