Clock Keys

Clock keys are special tools to wind mechanical clocks. The primary use is to wind the mainspring of a mechanical clock. The mainspring is the coiled spring that provides the energy to drive the movement. By turning the key, the mainspring is wound tighter, storing energy to power the mechanism. They come in various types and sizes to fit different clocks. The size and shape of the key’s winding square (the part that fits into the clock’s winding arbor) vary depending on the specific requirements of the clock’s movement. Common types include square double-ended keys. They are typically made of metal, such as brass or steel, to withstand the torque applied during winding.