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HermleMainspring-4
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#21/50 Hermle Mainspring

 #21/50 (same size)
Measures: 43/64″ (17mm) width x .0155″ (.40mm) strength x 47-1/4″ (1200mm) length
 

Quantity Price
1 - 2 $12.00
3 - 5 $11.75
6+ $11.50
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$12.00

SKU: MSH-21M
Upgrade your Hermle clock with mainspring #21/50, designed for reliability and performance. #21/50 are both the same size. This mainspring measures 43/64″ (17mm) in width, .0155″ (.40mm) in strength, and 47-1/4″ (1200mm) in length. Ideal for ensuring smooth operation and longevity, it’s an essential replacement for clock enthusiasts and restorers.

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  • P.O. Box 5510, Grants Pass, OR 97527
  • (800) 334-0135 or (541) 471-0194
  • info@ronellclock.com
  • Mon-Thur 9am to 4pm & Fri 9am-12pm (Pacific Time)
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