"UU" means rubber seals on the both sides of the long type bearing.
"LM" means metric standard type.
"LME" means inch standard type.
"OP" means open type.
"AJ" means adjustment type*LM...UU: LM...(sylinder), LM...OP(open type), LM...AJ(clearance adustable).
*LME...UU: LME...(sylinder), LME...OP(open type), LME...AJ(clearance adustable), LM...UU & LME...UU: Long type.