The clock pendulums on this page are for post 1960 mechanical German clock movements only. To get the proper clock pendulums for your clocks, you would need the movement numbers off of the back plate of the movement itself. Not off of the paperwork, not off of the wood case, but off of the clock engine itself. Then with this information we can determine what the CM length of your clock is and the manufacturer of it. There is in fact a few things we need, who the manufacturer is, the CM length, how wide the inside of the clock case is so we can get the right bob size. The manufacturer for German movements will most likely be one of the four listed below. The CM length is stamped on the back plate and represents the length of the pendulum from tip to tip, the leader it hangs on, and the suspension spring that the leader hangs on, all added together in centimeter measurement. Then to figure out the bob diameter, this is the round disk at the bottom of the pendulum and it needs about 2 inches on each side to swing around in the case without bonking the sides of the clock case.
German Seth Thomas and Mason Sullivan did not make their own movements or clock pendulums. You would need to follow the link and find out the true manufacturer. CM lengths on German movements are the clock pendulums length from the suspension post all the way down to the bottom of the pendulum. This includes the suspension spring, the leader that hangs on it and the pendulum itself from tip to tip. This means the actual clock pendulums length itself will be much shorter than this measurement.. Below are just a few examples of actual numbers that exist so you can see the pattern and determine who made your clock movement.
MOVEMENT # EXAMPLES + WHO MADE IT
- 131-020 35cm
- 141-040 94cm
- 351-830 66cm
- 1051-030 55cm
- 451-050 94cm
- 1161-853 114cm
- 75 R 116cm
- 83 K 93cm
- 85 P 65cm
- 78 K 116cm
- 84 SK 116cm
- 78 J 65cm
- 85 HK 116cm
- SETH THOMAS
This is for the pendulum bob only for a wood stick pendulum. Measurement is from one side to the other.
We offer the above clock pendulums bobs with various patterns. These are for mantle movements with the F-S regulator that you can adjust the timing.
Clock Pendulums #PD10
This pendulum bob is threaded on the bottom with a rating nut for easy timing of the clock. This can be used on mantle clocks as well as certain wall clocks such as a banjo. Measurement is the diameter of the bob.
Clock Pendulums #PD5
Gold tone brass pendulum with leaf decorations on the top of the pendulum bob. This pendulum measures seven inches in length and has a 2 1/2 inch diameter bob that weighs 3.5 ounces. Used with some modern wall clocks and 31 day clocks.
Clock Pendulums #PD28
Bob is 35mm in diameter and weighs two ounces.
Clock Pendulums #PD22
To get the CM length manually, measure from the top of the movement all the way down to the bottom of the pendulum rating nut threads. This measurement will include the suspension spring, the leader, and the pendulum tip to tip.
One Inch = 2.54 CM
The below chart is to get the approximate pendulum length tip to tip when its off of the clock, this is the pendulum only no leader or suspension. The smaller the bob, the shorter the pendulum will be.
CM length / Aproximate pendulum length tip to tip