This set of worm wheel gear which was used in boat . Material 34CrNiMo6 for worm shaft ,heat treatment : carburization 58-62HRC . Worm gear material CuSn12Pb1 Tin Bronze . A worm wheel gear, also known as a worm gear, is a type of gear system commonly used in boats. It is made up of a cylindrical worm (also known as a screw) and a worm wheel, which is a cylindrical gear with teeth cut in a helical pattern. The worm gear meshes with the worm, creating a smooth and quiet transmission of power from the input shaft to the output shaft.

In boats, worm wheel gears are often used to reduce the speed of the propeller shaft. The worm gear reduces the speed of the input shaft, which is usually connected to the engine, and transfers that power