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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