LFR50/5-6-2Z轴承 1212K轴承 GAKL5-PB轴承 1211K轴承 GAKL5-PW轴承 1210K轴承 GAKR5-PB轴承 1209K轴承 GAKR5-PW轴承 1208K轴承 GIKL5-PB轴承 1207K轴承 GIKL5-PW轴承 1206K轴承 1205K轴承 GIKPR5-PW轴承