Sintered gears have many merits because of the production process.
1, powder metallurgy gears  are produced by the press process with the carbide moulding. This make all the parts have the uniform shape.
2, With certain porosity powder metal gears have the self-lubricating character to make their moving quietly.
3, The sintered metal gears  production way can combine the structural parts with the gears together. So the complex parts can formed once to achieve the final shape. Like: Cam, ratchet, bevel gear  and helical gear, etc.
4, Standard involute gears can be made, which is simpler and cheaper than other process sections
The gears produced by powder metallurgy process have excellent surface roughness, balanced and consistent parts performance, and long wear life.