Arbor is a watch terminology that refers to the main axle of the watch. It is a metal shaft that holds all the components of the watch together and transmits power from the mainspring to the various gears which regulate the timekeeping functions. The arbor is connected to the balance wheel and escapement, and is typically made of steel or brass. It is an integral part of the watch and is incredibly important in order for the watch to run accurately and efficiently.
