Clock key size chart to get the right key

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Clock key size chart explanation

Clock keys have there own number system from 000 to 16 as seen in the Clock key size chart. However the number does not indicate what size is what number and can be confusing. It would make more sense if the key size was the MM of how wide the key was to fit, but this is not how it works. This section is to figure out what key number to order so the clock can be wound up. Subsequently, the clock key gets lost the most out of any other clock part. Of course, it can be tricky to find the right key for your clock because there are many sizes. The Clock key size chart will give us the right size key to order.

Double end clock keys

In addition, some keys have two sizes on one key and this is called a double end key. By and large, the clock key size chart will work for both the wind up part of the clock and also the smaller F / S portion. When the clock has a F / S regulator portion it will be at the 12 o'clock on the dial.

Alternately, if there is a small arbor inside of a hole at 12, this is the time regulator control and the key would have two ends. Thus, it may say F / S at this location or A / R. F / S stands for Fast or Slow, or it could say A / R to stand for Advance or Retard and is referring to the timing of the clock. Of course, if the clock is running fast in time, turn more to the Slow or Retard direction to slow it down. Refer to the Clock key size chart with your measurements to find a key to work with this function.

Getting the right Clock key size

Given these points, to get the key needed, measure the shaft the key is to go on to, then use the Clock key size chart to get the key size needed. Please do not call asking what key the clock needs, as you will be told it would still have to be measured. In short, measure the shaft that the key goes onto in MM and then use the clock key size chart to match it up.

The lazy way instead of the Clock key size chart

The Clock key size chart has all of the sizes listed however sometimes certain key sizes are known. Generally speaking, almost all post 1960 mechanical clocks, made in Germany take a size #8 key or crank, unless the movement is round. Ordinarily the round ones take a number 4. The American time strike antique units mostly take the size 7 key. Match your measurements to the Clock key size chart to be sure.

Shaft width / Key #
  • 1.75mm = 000 Key
  • 2.0mm = 00 Key
  • 2.25mm = 0 Key
  • 2.5mm = 1 Key
  • 2.75mm = 2 Key
Shaft width / Key #
  • 3.0mm = 3 Key
  • 3.25mm = 4 Key
  • 3.5mm = 5 Key
  • 3.75mm = 6 Key
Shaft width / Key #
  • 4.0mm = 7 Key
  • 4.25mm = 8 Key
  • 4.5mm = 9 Key
  • 4.75mm = 10 Key
  • 5.00mm = 11 Key
Shaft width / Key #
  • 5.25mm = 12 Key
  • 5.5mm = 13 Key
  • 5.75mm = 14 Key
  • 6.0mm = 15 Key
The content of this website is copyright by Clockworks and written by James Stoudenmire in year 2020

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Jerry
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Jerry

I have a Welby Westminster mantle clock and need new hands and a key

Tom
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Tom

I have a Taylor 668 that we use for a Gilbert Hollywood clock. What is the key size?

Russell
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Russell

The key of my carriage clock no longer winds the clock because the interior shape has worn. It is a double ended key. What size key replacement do I need? I can see no size indicator on the key. It is a Cloisonné style clock, estimate late 19th early 20th century. Thanks. Russell

Tracey
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Tracey

Hi, I have a Rythem Gloria clock and need a key for it. Does anyone know what size I am likely to need please?

Jon Garcia
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I now have an International Time Recording Master Clock 65″ without a wind up key. Can you help me? Jon

Steve Jones
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Steve Jones

I was given a Forestville clock from Canada but it has no key. My Howard Miller clock key from 1995 does not fit it (key is too big). What size do I need?

Michael P Bolton
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Have a Smiths Enfield mantle clock , made in England Great Britain , probably in the 1940’s have lost the key clock chimes has three areas to wind the clock any idea on a new key size ?

Keith
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Keith

I have a Waterbury cottage clock, key wide at the 11 o’clock position (no strike or chime). I’ve measured the key shaft as 3.3mm x 3.3mm with calipers. Sometimes I’ll get a 3.2mm reading. The key supplied with the clock measures 3.5mm x 3.5mm, it works, but it isn’t a snug fit. Should this clock really use a #4 instead of the #5 that came with it?

Darren Cornell
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Darren Cornell

What size winding key does IBM Time punch/recorder 1927 Chevrolet take?

Geralyn Howell
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Geralyn Howell

I need to know size of wind up key for a poppy dog clock by trauma

Geralyn Howell
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Geralyn Howell

I need to know the wind up key size for a Poppo dog clock by Tezuka Japan

Paul Shakespeare
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Have a french marble mantel clock the face has the name lassalle on it cannot find any information online any idea wear I might find out aboutit

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