Engranajes de piñón de paso 48P eje de 3 mm 3,175 mm, diente 13T - 41T, aluminio, motor RC
The smaller 13t-15t sizes are difficult to manufacture as there is very little material, therefore the teeth have a thicker curved profile at the grub screw end. 48 Pitch: The gap between each tooth, check this matches your spur gear.