Hermle Clock Movement 340

Hermle 340 / 341 movement notesHermle movement identificationTiming a balance clock movementWhat Happened to the old movement?Other Names Used

The Hermle 341 and 340 series is a spring driven westminster chime unit that takes a size #8 key. This is a square shaped movement with the movement plate size of 100 x 100mm. What is being offered on this page is the movement only with out the pendulum, gong or dial. These movement come as the movement itself with its hand nut and if a pendulum unit, comes with the suspension spring and leader.

  • Less cost than a cleaning in most cases
  • Should last 25-30 years, a repair would not
  • Easy to install, we can help if needed
  • Ships same day as order

How to identify a Hermle movement

On the back plate of the clock movement you will see the numbers such as 451-050 94cm. These numbers let us know everything we need to know about the mechanical clock movement itself. This tells us if the clock is weight driven or spring driven, if it has a pendulum, the size of the movement and the length of the hand shaft and much more. To match up the numbers to the new movement numbers is to get the exact same movement you have now but brand new. Since the new movement will be the exact same and not some knock off imitation, all of your existing clock components will usually fit just the same as the old unit.

There are two balance movement styles produced by Hermle. The old style and then the new style.

Old Style

The old style is one with a round spring that goes up and down (Vertical) in a circle around the center arbor of the balance wheel. In this style there is a slide arm with a tiny weight on the balance wheel itself. There is a + and - on the wheel. To speed up time go towards the plus sign. However this style is not always easy to regulate and can be very hard to get it perfect. The factory has special devices to make it perfect however it’s not that easy on the customer end with this style balance and this is why it has been improved upon. If you have the old style balance then your clock movement has some age to it and you may want to replace the unit anyway. We have the movement brand new with the new style balance for less than the cost of a cleaning on your old unit. Figure your clock movement has lasted you 25 years or so then in theory the new unit should last more than this with the improved aspects.

New Style

The units offered on this page all have the new and improved balance assemblies. Despite the change on the balance, these units are a direct fit and will install in the clock case the exact same way as the old unit. If the numbers match from the old unit to the numbers offered on this page, than the movement will be the exact same as it is now but brand new and with the improved balance.

The improved upon balance units have a different kind of hairspring (Horizontal) and a screw to regulate it rather than a slider arm. The regulator screw is on the back of the movement near the balance and has a + and - sign next to it. If the clock needs to be faster to keep time then the screw would be turned to the plus and opposite for slowing time.

Hermle clock movement exploded view

With age, the mechanical clock movements oil solidifies and becomes black and sticky. By the time 20 or 30 years go by, the oil has solidified and is creating wear on the movements brass plates.

If you look at your old clock movement, you will see holes in the brass plates where there are small pivot arbors sticking into these holes. These pivots are what the gears of the clock ride upon and as the pivots spin in the solidified oil, this makes the holes oblong instead of round. With the pivot holes oblong, the holes are pinching the pivots and creating resistance in the gear train. With the solidified oil and the pinched pivots, the clock will eventually stop working or chiming.

This wear takes place in the holes that are in the brass plates and is hard to identify sometimes. These holes in the brass plates become oblong instead of round and this pinches the pivot arbor going into it. Between this, and the solid oil, the clock ceases to function. To have this repaired is an expensive and long process. To have a mechanical movement serviced can cost hundreds, if not over, a thousand dollars and in some cases it can take weeks or months to complete it.

Other Names Used

There are a variety of other names that can be on the movement even though it is produced by the Hermle company.

  • Hamilton
  • S. Larose
  • Mason & Sullivan
  • Welby
  • Pearl
  • Tally Industries
  • Bulova
  • Seth Thomas
  • Howard Miller
  • Sligh

Hermle Number Examples

Below are some typical examples of the Hermle clock movement numbering system. If your clock numbers are similar to this, its made by Hermle.

  • 451-050 94cm
  • 340-020
  • 140-070
  • 451-030 66cm
  • 341-020 45cm
  • 1151-050 114cm
  • 451-053 94cm
  • 1161-853 114cm
  • 141-070 45cm
  • 351-050 55cm
  • 1161-850 94cm
  • 241-070 94cm

Assistance = 800-381-7458

Clock Movements

341-020 341-020 Hermle clock movement
  • Pendulum Unit
  • 33.2mm Hand shaft
  • 5 Hammer Below
  • Plate size 100 x 100mm
Front Side Back


341-020: $255.00

341-021 341-021 Hermle clock movement
  • Pendulum Unit
  • 27.6mm Hand shaft
  • 5 Hammer Below
  • Plate size 100 x 100mm
Front Side Back


341-021: $255.00

340-020340-020k Hermle clock movement
  • Balance Escapement
  • 33.2mm Hand shaft
  • 5 Hammer Below
Front Side Back

340-020: $270.00

341-020K 45cm 341-020k Hermle clock movement
  • Pendulum Unit
  • 33.2mm Hand shaft
  • 5 Hammer Below
  • Calendar Movement
Front Side Back

341-020K/45: $255.00

341 Parts -Front Diagram Hermle Clock Parts 341 front diagram View Product
341 Parts -Back Diagram Hermle Clock Parts 341 back diagram View Product

Hermle movement number starts with....