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Specification:Name: 08B Precision Industrial Drive Sprocket WheelType: Sprocket with StepMaterial: 45# SteelTooth Surface Treatment: High Frequency Quenching and Tempering of TeethTooth Surface Hardness: HRC40-50Pitch: 12.7mmNumber of teeth: 20 TeethKeyway Bore: 15/16/17mm (keyway 5mm),18/19/20/22mm (keyway 6mm),24/25/26/28/30mm (keyway 8mm),32/35mm (keyway 10mm)Application: Used in Various Mechanical Transmission PartsScrew: Bore 15-22mm (2*M6); Bore 24-35mm (2*M8)Features:1.Sprocket materials is positive forty five steel, tooth high frequency quenching, tempering: HRC40-50.2.Strong resistance to oxidation, acid, alkali and corrosion resistance.Note:1.Sprocket dimensions (such as bore, whole thickness, step outer diameter, etc.) could range slightly because of batch differences, and particular parameters prevail in kind.2.Screws and key pins are purchased separately.Package:Packing : Plastic bag / Carton box.Quantity : According to your Choose!