Hair Spring / Balance Spring


Watch 101 - What is a Balance Spring aka Hair Spring

Watch 101 - What is a Balance Spring aka Hair Spring

The hair spring or the balance spring supports the balance for the mechanical watch to work. This is one of the basic but most important parts of a timepiece. Without it, timekeeping is inaccurate. It serves as the harmonic oscillator that resists outside factors to keep watch precision. It functions as a pendulum in a clock but this is portable thus most suited for watches.