Details of conveyor roller : 1) Diameter: 50mm-219mm. 2)Length: 190-3400mm. 3) Tube: Q235(GB) equal to S235JR(DIN) 4) Shaft: 45# steel(GB) equal to C45(DIN) 5) Bearing: Single & Double Row Deep Groove Ball Bearing 2RZ&2Z with C3 clearance. 6)Grease:Lithium soap type grease,grease retaining inner seal with Multi-stage Labyrinth and Retention Cap with Outboard Rubbing Flinger Seal.  7) Lubrication: Grease is Lithium soap type grease with Rust Inhibitors.  8) Welding: Mixed gas shielded arc welding end.  9)Painting: ordinary painting, hot galvanized painting, electric static spraying painting, baked painting We provide OEM service based on the design drawing or the sample. We can also provide any other customized belt conveyor idler rollers on the base of your drawings or original samples.