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