Ing kothak gear planet, poros gear spur nuduhake poros sing dipasang siji utawa luwih gear spur.
Poros sing ndhukung gear spur, sing bisa dadi gear srengenge utawa salah sawijining gear planet.Poros gear spur ngidini gear pamilike bisa muter, ngirim gerakan menyang gear liyane ing sistem kasebut.
Bahan: 34CRNIMO6
Perlakuan panas dening: Gas nitriding 650-750HV, 0.2-0.25mm sawise grinding
Akurasi: DIN6