689W4ZZ Cuscinetto a sfera schermato in metallo sigillato S689K 689 9 x 17 x 4 mm selezionare
Type：689 S689K 689W4ZZ. Select Bearing grades：Ordinary class, Motor class or Specialty class. Bearing materials mainly include : iron sheets， carbon steel， bearing steel，stainless steel， plastic， ceramics and other new materials.