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This linear motion shaft of 20mm in diameter and 500mm in length is case hardened, and is suitable for use with linear support blocks and closed type slide units in linear motion applications. Due to its hardness, it can extend the life of ordinary precision instruments. We have strictly controlled every precision process to ensure quality. It can be applied in many fields. Strictly control every precision process to ensure quality. Specifications: Material: Chrome Plated Carbon Steel Hardness: HRC55-60 Diameter: Approx. 20mm/0.79in Overall Length: Approx. 500mm/19.69in Flatness: < 0.15/1000mm Surface Finish: ≤Ra0.4S Weight: Approx. 1243g Package Includes: 1 x Steel Rod Note: Please allow 1-3mm error due to manual measurement.