Mainsprings - Automatic

Please refer to the Automatic Mainsprings Chart for specific details about each mainspring.

Unbreakable Mainsprings from Cas-Ker Co. For Automatics, with an attached bridle.

Energize a mechanical watch with the proper mainspring, available from Cas-Ker Co. You'll find an extensive selection of mainsprings for pocket watches and wrist watches at Cas-Ker. Additional mainsprings may be in stock in our warehouse, not listed on our website at this time - call us if you don't see what you need here.