Mainspring Size Chart

Find pocket watch mainsprings on this site by clicking on the brand links below. (Elgin Mainsprings, Hamilton Mainsprings, etc.) To order other mainsprings please call 1-800-487-0408. Note: Some numbers listed below may be discontinued. Please call or email [email protected] for availability.

Mainspring Sizes

Cas-Ker is a leading supplier of mainsprings and other pocket watch parts to professional horologists. Trust Cas-Ker for the best service in the watch material business.

Cas-Ker Co.
2550 Civic Center Drive | Cincinnati, OH 45231 | CALL 800-487-0408 | FAX 800-487-5848 | Cincinnati 513-674-7700