400 Day Clock Suspension Spring Sizes

A company called Horolovar makes suspension springs for 400 day clocks. Various thicknesses are available. If the spring is too thick the clock will gain time, and if too thin it will lose time

Suspension Spring Thickness for Schatz 400 Day and 1000 Day Clocks

Schatz clocks have a model number inside a circle on the back plate (49, 53, 54 or JUM/7). The other numbers on the back of a Schatz clock are the date code (month and year). Here are the suspension spring thicknesses for Schatz 400 day and 1000 day clocks:

  • Schatz standard size clock (49 on back plate): .004 inch
  • Schatz miniature (53 on back plate): .0023 inch (Note 4-8-12: I now recommend a 0.0024 inch thick spring)
  • Schatz 1000 day clock (54 on back plate): .0024 inch
  • Schatz midget 400 day clock (JUM/7 on back plate): .0022 inch

Suspension Spring Thickness for Kundo 400 Day Clocks

  • Kundo full sized clock (about 12″ tall): .0032 inch
  • Kundo miniature clock (about 9″ tall, including the oval base model): .0023 inch (Note 4-8-12: I now recommend a 0.0024 inch thick spring)
  • Kundo midget (similar to the miniature but the anchor pin has an offset bend and makes contact with the fork slightly behind the back plate): .0022 inch

For other clocks, you will need the Horolovar 400 Day Clock Repair Guide to determine the proper spring thickness. Note: measuring the old spring’s thickness is not a reliable method, as the spring may not be a Horolovar brand spring. The Repair Guide and suspension springs are available from Norkro.com and other clock parts suppliers.

The thicknesses given above are for genuine Horolovar suspension springs, which most clock suppliers sell. You may want to ask to be sure you are getting Horolovar suspension springs.

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  1. Hi I have a 400 day clock with no name

    All it says on the back plate is (0)
    Unadjusted no jewels made in Germany
    I have taken a chance and bought a 0.24 spring. The problem I also have is the blocks that hold the spring are soldered not screwed together

    Thanks for any advice

  2. Hi bill I also recently inherited my mother in laws Gufa model 52 400 day anniversary clock however the suspension spring is broken. I looked on line to order one however there is no guide to insure me the proper size. the clock was made in Germany in GUTENBACHER. A friend of mine recommended you.

  3. Your clock was made by Jahresuhrenfabrik and probably needs a .004 inch thick suspension spring (on these older clocks the suspension unit needs to be custom made.). The following place sells the suspension springs if you want to install it yourself: https://norkro.com/collections/400-day-clock-parts/products/suspension-spring-material

    If you want me to overhaul the clock and replace the spring, details are on the following web page: https://billsclockworks.com/test/repair/400Day.htm

  4. i have an old 400 day clock/ about 12″high it needs a torsion spring/ no umbers or id marks/except for two little elephants stamped on to the back plate. any help please””

  5. Hi Bill,
    I recently got a 400 day anniversary clock — the letters KS, enclosed in a circle, are stamped on it. The movement measures 93x69x33mm. The entire suspension is missing including the suspension spring. Would appreciate any help re. the spring specification.

  6. The Schatz 49 uses a .004 inch thick suspension spring, as listed above. The following place sells them (just the spring, not the fittings): https://norkro.com/collections/400-day-clock-parts/products/suspension-spring-material

    This is called the “Standard” movement.

    I can get you a set of metal leveling discs for $51 plus $5 shipping and handling, you may order by paying to my PayPal address of [email protected] (these will be original Schatz used parts).

  7. Hello Bill, I inherited my mother-in-law’s Schatz 400 day anniversary clock. It’s suspension spring is broken and I need to order a new one; but I’m unsure of the size needed. On the back plate is engraved “No (0) Jewels Undajusted”; “7 54”; and in the circle “Aug. Schatz & SOHNE 49 Germany”. I’d appreciate any information you can share about this clock and especially what size suspension spring I need.

    I also have the same problem with the leveling wheels as Brian above (message dated April 4,2012.) If you can advise me about this issue, I’d appreciate it very much! Thank you! I find your website very.

  8. I have a 9 inch tall kundo with a broken wire. Whwt us the spacing of the top to fork and fork to bottom clamp.

  9. The length is not critical to the clock’s running. It should be long enough so that the pendulum is about 1/8 inch above the base. You may need to raise the fork slightly. Also, the beat may need to be adjusted so the tick tock is even from left to right and right to left.

  10. Hi. I have a 1902 Jahresuhrenfabrik domed anniversary clock that I am repairing however I cannot seem to get the torsion spring to the correct length & it will only run for 45 mins. I am using .004 Spring are you a be to tell me the correct length for this spring please. Any help would be greatly appreciated.

  11. I have a Welby pendulum clock with key and dome. The wire was bent and twisted and broke. I do not see any numbers in which to identify the model It is gold face with blue roman numerals.


  12. I have a small one kern dome clock from west germany the brass spring wire is broken and i dont know the size of it so its impossible to order! Could you please inform me on the size so i could know?

  13. Hello dear Bill, I need suspension spring for my AUG.SCHATZ&SOHNE 53 GERMANY, TWO(2)JEWELS UNADJESTED 2 55 (MINIATURE?)clock. Please tell me which size I have to buy. And where would be to do it? Thanks

  14. I have an original Schatz 400 day clock (49) brass. My problem is the Suspension wire is broken and the piece that’s supposed to be at the end of it is missing. I have the book and the key but I don’t have the spare suspension wire or what ever might be at the end of it. Does anyone know what I can do to find the parts I need. The book shows me how to replace the suspension wire. I live in central California and I’m sure I can afford the new suspension wire, but not to send it off to be fixed by someone else. Can anyone help me find the new suspension wire and the piece that I’m missing. Thank you so much for any help or information you can give.

  15. Hi, I have a Kundo clock about 9″ tall and it stops working after about an hour. Im assuming it needs a new suspension spring. Is there a guide or template to measure and cut the new spring to the correct size.

  16. Ross,

    The new .004 inch thick wires will work in the Schatz 49, as long as long as they are Horolovar brand. I have been using them for years. They are correct for the clock.

  17. Hey Bill, I am surprized not to find any referance to my delema. I have a 1953 Schatz 49 and bought a package of .004″ suspention wires. They are notably different from the original (as well as the spare that came with it). All are the correct .004″ thickness however, the originals are .021″ wide and the new are .016″ wide. That seems like a hugh discrepancy in tortional effect.
    What say you? Thanks very much Ross

  18. I can’t figure out how to remove the wire from the block just above the weights. Any help would be appreciated.

  19. hi, ihave a schatz clock with a broken suspension spring could you please send an email with the lenghts of suspension springs on
    and oblige kind regards
    bradford west yorks.
    71a market street
    bd13 3en

  20. hi,bill.iam paul,ihave a zodica sign 400 day clock,and is 7″-9″high.no brand.made in germany.can you tell me what the suspension spring size for it to me?thankyou.

  21. Hi Bill,
    I recently inherited a Schatz 49 Anniversary Clock (1/1955). The problem is they seemed to have used plastic for the three adjusting level wheels. 1 of 3 is in good working order. One is broke in half and the other is missing altogether. Do you have any suggestion finding OEM parts or a substitute?

  22. hi bill
    i have a kundo miniature 400 day clock
    the suspension wire requires replaceing
    can you please tell me the size to cut the wire

    thank you terry capetown southafrica

  23. Hi Bill,
    I have a Kundo 12″ anniversary clock. I have replaced the suspension spring and I can’t get it to continue working after I initially get it going. It comes to a halt after a few minutes and won’t self sustain. What should I do? Any help would be great.

  24. where would I be able to buy a bottom block for a koma 400 day clock? I am in New Zealand!

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