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Choosing The Correct Clock Movement Shaft Size When Making a Clock


Quartz Clock Movement Shaft

Clock movements are available in a wide range of sizes. There are a few important measurements you will need to have when ordering a clock movement, to ensure you get the right one to fit your application.

 

Thread Length

You’ll want to make sure that the clock movements thread length is long enough to fit through the thickness of the material you are mounting the movement to (clock dial material could be a simple clock face or decorative items like a wood plaque).

The threaded portion of the shaft (post) should come out of the mounting surface with about an 1/8” of length left for the mounting hardware.  (Note: Some push on style clock movements will not have a threaded shaft.)

 

Quartz Clock Movement DialTotal Shaft Length

When using a glass front on your clock keep in mind the total shaft length (total post length). You’ll want to make sure there is enough room underneath the glass to fit the total shaft length including its minute hand cap nut or if you’re adding a second hand.

 
Shaft Diameter

The post mounting hole of your clock dial (or mounting material) needs to have a large enough diameter to fit the shaft of the clock movement through it.

 

 

Measuring the Shaft When Replacing a Broken Quartz Clock Movement

Clock Movement Shaft measurement

The easiest and most accurate way to measure the shaft length on a clock movement is to use the depth gauge on a digital caliper.  A ruler can also be used to measure the shaft length, if you do use a ruler to measure the shaft size make sure the ruler starts at 0, many rulers have their zero point a bit away from the end of the ruler.

Once you have found your measuring device measure from the top of the post/shaft down to the movement housing. This will give you the movements total shaft length, which will be needed when ordering a replacement clock movement.

If you are reusing your existing clock hands, you should confirm that the new movements shaft for both the hour and minute hand are the same size and shape as your existing hands mounting diameter.

 

For an overview of quartz clock movement parts and assembly see our article Quartz Clock Parts and Assembly Diagram.

 

Clock movement shaft measurement

 

 

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2 Comments

  1. Karen, May 31, 2016 at 11:24 am:

    I am trying to figure out what clock post length I need for a one inch thick wooden piece?

    • Esslinger.com, May 31, 2016 at 2:25 pm:

      Hi Karen,
      That’s a tough one. You would have to find a movement that has a really long shaft, and one where the threaded portion alone is at least 1 1/8″ (allowing for enough length to fit through the 1″ thick wood plus room left on the threaded area for the mounting hardware). Unfortunately most clock movements wouldn’t have long enough shafts to fit through something 1″ thick. Another less desirable option would be to cut out a “box” from the wood to fit the entire clock movement casing into, allowing the shaft to fit through a thinner area. I hope this helps!

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