... gear2. Ring gear3. Duplicate gear4. Sprocket5. Pulley6. Worm gear7. Spline hub They are widely used in motor, enginee, gearbox, oil pump ... guide, inlet and exhaust valve seat.Transmission parts, gear hub and parts of various high and low speed synchronizer, clutch ... exhaust valve seat. Oil pump parts:Oil pum gear, gear hub, various rotors, inner rotor and outer rotor, gerotor, ...