How to measure the Hermle quartz handshaft

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Hermle quartz handshaft measurement

How to measure the Hermle Quartz handshaft. Measure the entire post that sticks out of the movement. From the plastic base all the way out to the tip of the post. This measurement is different from how all other quartz units are measured.

Hermle used three hand shaft lengths on their base units. These lengths are 16mm, 21mm, and 26mm. There was a time some of the 26mm had an internal modification to create an extremely long hand shaft. It was something like 1 1/4 or 1 1/2 inches. If working with one like this there is no replacement for this unfortunately.

Hermle to regular conversion

The following is the conversion from the Hermle Quartz hand shaft length, to the length of the threaded post to order from us.


  • 1. Measure the hand shaft on your current Hermle quartz clock movement
  • 2. Convert to the post length needed with the below information
  • 3. Order whatever movement you would like from us with that post length.
  • 16mm (About 5/8") = Get a 5/16 post
  • 21mm (About 3/4") = Get a 7/16 post
  • 26mm (About 1") = Get a 11/16 post

Next step to replace the Hermle quartz

Now that the old unit is out of the way and the conversion is known from the old hand shaft length to the new post length, we are ready to shop for a replacement. The next step is to take note of the overall size of the new movement and be sure that it will fit dimensional behind the dial.

The new unit may be taller or wider so you want to be sure it will fit in the clock case. If verified its ok, we can pick a new unit with the post length that was converted. Be sure to get new hands as well. They are on the same page as the product. The old ones will not fit without modifications.

How to measure the Hermle quartz handshaft
The content of this website is copyright by Clockworks and written by James Stoudenmire in year 2020

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