... high working speed 2.high temperature rise 3.good seal performance china tension pulley bearing Corresponding Type: VKM13100,VKM13201,F-121287.5,QTT100 ... ,S400 ,S507,IR-9811 ,IR-9890,CR1692,F-121287 ... 97535002,0829.19 ,08.29.19,0829.54,GT80260,F-121287.1,F-39752.2,F-120959.1.1, The material of inner rings ...