19 x 0.43 x 36 - 400 Day Clock Mainspring

400 day mainsprings are made of the finest grade steel, tempered evenly throughout the entire length. They are designed to provide the right amount of power for your 400 day clock. Each mainspring is coiled to a diameter small enough to slide into the barrel easily. No expensive mainspring winder needed! Our mainsprings are sized by the width of the spring and the inside diameter of the barrel in millimeters.

19mm high - 0.44mm thick spring (strength) - 36mm barrel diameter.

Made from quality steel & used by professional clockmakers. 

Many professional clockmakers replace a clocks mainspring not only when it breaks but as part of a complete service. 

A mainspring winder is advised as removal and fitting without one can cause damage or injury. 

100's of other sizes stocked.

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