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This is a chain pinion sproket for chain with 10 teethm with Pitch equal to 8 mm and roller diameter equal to 5 mm; according to ISO/R 606 - DIN 8187 technical norm.
The center hole is provided with a keyway 2 mm wide and 1.5 mm deep to permit the connection with a motor shaft.
The part is provided with long hubs on each side of the toothed wheel.
The sprocket is able to work effectively.