Articles on: Mechanical Clock Parts

Hermle Mainspring Barrel Numbers


Hermle mainspring barrel numbers


Hermle mainspring barrel numbers


Mainspring barrel number to size spring


Barrel Number


Mainspring Dimensions MM


10


17 x .45 x 1490


11


17 x .42 x 1500


20 & 56


17 x .38 x 1200


21 & 50


17 x .40 x 1200


31


12 x .34 x 1150


32


12 x .42 x 1100


33


12 x .32 x 1150


40


17 x .38 x 1100


41


21 x .40 x 1550


42


17 x .40 x 1100


52


17 x .42 x 1200


54


21 x .42 x 1900


55


21 x .45 x 1800


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Hermle Mainspring Barrel Numbers


Hermle mainspring barrels have numbers on their caps, which help identify the hole end spring inside the barrel.


In most cases, you must remove the barrel from the clock to see these numbers. The chart lists various cap numbers and the corresponding hole end springs found inside the barrels.


Check for Damage


After identifying the hole end spring size using the Hermle mainspring barrel number, locate it on the hole end mainspring chart to order a replacement.


If the mainspring needs replacement, inspect the barrel's teeth for damage caused by the spring's immense power when it broke. Additionally, check the next wheel up on the train, as its teeth might also be damaged. In such cases, replacing the entire movement may be the best option.


Get a New Movement Instead


To identify the movement, locate its number on the back plate. Look for a stamp on the brass plate itself, as the number won't appear on the clock case or accompanying paperwork. Once you have the number, visit the appropriate page to order a new clock movement.


When the mainspring breaks, the second wheel up from the barrel might have a bent arbor. Check this part carefully. If the arbor is bent, you’ll need to either straighten it or replace the wheel. Straightening it can be challenging, so replacing the entire unit may save time and effort.


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Updated on: 27/12/2024

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