... , cast iron 2. high loading capacity: 1-30tons Mining Car Wheels :200-600/900 250-600/900 300-600/900 ... material: cast steel or cast iron 2. constitute: two wheels, one axle, four bearings, and other parts.3. ... , 900mm, and etc.5. the type of the wheels: hollow wheel sets and solid wheel sets.6.the ... diameter of the wheels: 300mm, 350mm, 400mm, 450mm7.the material of the ...