Cas-Ker Mainspring Catalog

Cas-Ker's Mainspring Catalog includes unbreakable mainsprings for American pocket watches and wrist watches. Complete with mainspring end type illustrations, size charts, and organized parts listings, it's easy to find what you need. Add our Mainspring Catalog to your cart to receive a print catalog with your order.

If you prefer, you can immediately download a digital PDF version of our catalog. Click here to download.