... industry, harbor, coal industry, power industry, cement industry, etc2.Tube: Q2353.Shaft: 45# STEEL4.Bearing: Single & Double Row Deep Groove Ball Bearing ... of types and are widely used in the electric power, metallurgy, mine, coal, cement, steel, chemical, port, ... hydroelectric power, and grain industries. Delivery detail: as uaual 5000 pieces, ...