... used in motor, enginee, gearbox, oil pump, water pump and other structure of transmission. Advantages of PM gear: ... comparison with machining gear:Yield strength, breaking stength of the toothDensity 7.2 g/cm³Profile precision H6~ ... synchronous ring. Motorcycle:Driven gear and parts, sprocket, starter pawl, ratchet, star gear, duplicate gear, pinion gear, gear ring, variable gear, pushrod cam, shaft ...