Clock Key Brass Single-End
Price range: $10.00 through $12.00
Brass Single-End Clock Key
Single end brass clock key to wind up a wall or mantle mechanical clock movement. See instructions on the top tabs for how to get the right size key for your clock.
Find the Right Clock Key
Not sure which key fits your clock? Use our guide to identify the correct size for your movement.
Price range: $10.00 through $12.00
SKU: CK4
Categories: All Products, All Clock Parts, Clock Keys and Cranks, 400 Day Clock Parts
Ships From: USA
Sold By: Clockworks Inc.
Returns: 30-day return policy
Secure Payment: Shop with confidence
Clock Keys and Cranks- Use our clock key chart to figure out the exact fit for the clock. We offer keys and grandfather clock cranks.
Please view these information tabs to help with determining the proper key size for your clock.
Mechanical Clock Keys
Mechanical clock keys are the clock parts that are most frequently lost. Once the clock key is no longer with the clock, it always seems to disappear. With the below information you can order a new key utilizing the clock key size chart.
Getting the Right One
We have mechanical clock keys in all the sizes available. Between the key chart or the movement type information below, you have a good chance of finding the perfect key. The movement type includes if the clock is made in Germany or USA and when it was made.
This is the fastest and most easiest way to get the clock key. The further back in time we go with clocks, the more we would need to rely on the key chart instead. There will be a stamp with the country of origin on the back plate of the movement and this can help us get the key.
Clock Key Size Chart Explanation
- 1.75mm = 000 Key
- 2.0mm = 00 Key
- 2.25mm = 0 Key
- 2.5mm = 1 Key
- 2.75mm = 2 Key
- 3.0mm = 3 Key
- 3.25mm = 4 Key
- 3.5mm = 5 Key
- 3.75mm = 6 Key
- 4.0mm = 7 Key
- 4.25mm = 8 Key
- 4.5mm = 9 Key
- 4.75mm = 10 Key
- 5.00mm = 11 Key
- 5.25mm = 12 Key
- 5.5mm = 13 Key
- 5.75mm = 14 Key
- 6.0mm = 15 Key
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. So how do you use the Clock key size chart to get the right key?
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.
How to find the Right Key for Hermle Movements
Clock Key Required by Hermle Movement Number
Use this Clock Key Chart to quickly identify the correct key number and type based on your Hermle movement ID number. Ensure a perfect fit for winding your clock!
Keys for German Units Post WW2
German made post WW2 movements that are square or rectangle will take a number 8 key or crank.
If the clock movement is round and made in Germany the key size is number 4. Some round ones will take a number 3 but if getting a 4 it will still fit and wind the clock either way.
Keys for USA Units 1900 – 1950
American clocks made from around 1875 until after the second war almost always take the size 7 clock key. The number 7 keys fits the 8 day time / strike units pretty much every time and this is what USA made the most of. This rule may not apply to Westminster (3 places to wind) or time only (one place to wind) clock movements.
Keys for Korean and Chinese Clocks
Size 7 for these units usually. All the 31 day clocks with Asian movements and also US replicas made in India, all take size 7.
The Over Wound Myth
Of course, if a clock is not working, people wind it up all the way in attempts to make it run. Everyone winds it up, but the clock still doesn’t work, so it remains wound up.
The only way a clock can be overwound is if someone winds it up for so long that the mainspring becomes stuck.
How Do I Know What Size My Clock Key Is?
Understanding the correct size of your clock key is crucial for maintaining and operating your timepiece. The key size affects how well you can wind the clock and keep it running smoothly. If you’re unsure about your clock key size, this guide will help you determine the right one and ensure your clock remains in good working order.
1. Why Is Knowing Your Clock Key Size Important?
Understanding the size of your clock key is essential for several reasons. First and foremost, the right key ensures that you can wind your clock efficiently. If the key is too small, it won’t grip the winding arbor correctly, making it challenging to wind the clock. Conversely, a key that is too large may slip, potentially damaging the clock’s mechanism. Therefore, knowing your clock key size prevents unnecessary wear and tear on your clock and ensures accurate winding.
2. How Are Clock Key Sizes Measured?
Clock keys are typically measured using a standardized numbering system. This system ranges from small to large, with each size corresponding to a specific measurement in millimeters. The size is determined by the diameter of the clock’s winding arbor, which is the part of the clock where the key fits. For instance, a size 6 key fits a winding arbor with a diameter of 3.75 millimeters. By measuring the arbor, you can accurately determine the correct key size.
3. What Tools Do I Need to Measure My Clock Key Size?
To measure your clock key size, you will need a few simple tools. A caliper or a precise ruler is ideal for measuring the diameter of the winding arbor. Additionally, you may use a clock key gauge, a tool designed specifically to measure clock key sizes. By using these tools, you can determine the exact size of your winding arbor, ensuring that you select the correct key.
4. Step-by-Step Guide to Measuring Your Clock Key Size
Determining your clock key size involves a straightforward process. Here’s how you can do it:
- Locate the Winding Arbor: First, identify the winding arbor on your clock. This is usually found on the clock’s face, where the key is inserted for winding.
- Measure the Arbor’s Diameter: Using a caliper, carefully measure the diameter of the arbor. Ensure the caliper is placed accurately to avoid any errors in measurement.
- Consult the Key Size Chart: Once you have the measurement, consult a clock key size chart. Match your measurement with the corresponding key size. For example, if your arbor measures 3.75 millimeters, you’ll need a size 6 key.
- Test the Key: If possible, test a key of the determined size on your clock. It should fit snugly, with no slipping or difficulty in turning.
5. What If I Don’t Have the Original Key?
If you’ve lost the original key or never had one, don’t worry. You can still find the correct size. Measure the winding arbor as described above and use the measurement to select a new key. It’s important to get the size right the first time to avoid damaging your clock.
6. Where Can I Purchase the Correct Clock Key?
Once you’ve determined the correct size, you’ll need to purchase a replacement key. At Clockworks.com, we offer a wide range of clock keys in various sizes to suit different types of clocks. Whether you need a standard size or a specialty key, you can find it in our catalog. Simply visit our website, navigate to the clock keys section, and select the size you need. We provide detailed descriptions and specifications for each key, making it easy for you to find the perfect match.
7. How Can I Ensure Longevity and Proper Maintenance of My Clock Key?
Proper maintenance of your clock key is as important as knowing its size. After every use, ensure that the key is stored in a dry place to prevent rust. Additionally, avoid using excessive force when winding your clock, as this can wear down the key and the winding arbor. Regular maintenance of both the clock and the key will ensure they last for years to come.
8. Are There Different Types of Clock Keys?
Yes, there are several types of clock keys, and each serves a different purpose. The most common are double-ended keys, which have different sizes on each end for winding and setting the time. Some clocks, especially antique ones, may require specialized keys. It’s essential to identify the type of key your clock requires before making a purchase. At Clockworks.com, we offer a variety of key types to match your specific needs.
9. What Should I Do If My Clock Key Doesn’t Fit Properly?
If you find that the key doesn’t fit properly, it could be due to several reasons. First, recheck the arbor’s diameter to ensure you’ve measured correctly. If the measurement is correct and the key still doesn’t fit, there may be an issue with the clock’s winding mechanism. In such cases, it’s best to consult with a clock repair expert. At Clockworks, we not only sell parts but also offer clock repair services. You can contact us at [email protected] for assistance.
10. Final Thoughts
Knowing the size of your clock key is fundamental to the proper functioning and maintenance of your timepiece. By following the steps outlined above, you can easily determine the correct key size and avoid potential damage to your clock. For a wide selection of clock keys and expert advice, visit Clockworks.com. We’re here to help you keep your clock ticking smoothly.
Double-End Clock-Key F-S Note
The following is a Double-End Clock-Key F-S Note that will be very handy. Some clocks have a small place that looks like a mini clock winding arbor at the 12. It may say F/S or A/R. The F/S represents fast or slow, and the A/R represents advance or retard.
This controls the timing of the clock and turning it to fast or advance makes time faster and the opposite for slow. An ideal double end key fits both the winding arbor to wind the clock and also fits the smaller time regulator aspect.
This is not easy to get and at the same time is the most lost part. It is possible to regulate the clock another way with an adjustable bob instead of a fixed length bob.
Get the double end key the hard way
Using the clock key size chart, get the right size that the clock requires. This chart works for both the fast/slow regulator and also to wind the clock.
However, this is not easy because it requires a measurement of the post the double end key fits onto. In order to get this measurement remove the clock movement or the dial. Without access to the front of the movement it is hard to measure exactly how wide the arbors are that the key is to go on.
Double end clock key the easy way
There are many sizes and combinations for the double end key and it may be tricky to get the right size. Sometimes it is best to just get the 4 pack of double end keys we offer
. These are the top 4 most common double end clock keys so the odds are one will be the correct key. Ideally this will supply the clock with a key that fits both the F/S regulator and the winders. However be aware this 4 pack does not guarantee one will work.
Double-End Clock Key F-S Note Continued – An alternate method
It is possible to forget the whole double end key game and use a single end key instead. It does make things easier and is a better long term solution.
Inevitably, once the perfect fit the key will get lost again. This seems to be the trend of what happens. Once the key is separate from the clock, there is a higher chance of it getting lost. Many times we suggest putting the key in the bottom of the clock case for safe keeping
Using an adjustable bob instead
The solution to the double end key problems is to get the single end key to wind the clock. Also get the adjustable bob. The adjustable bob can be regulate the clock with the pendulum instead.
The bob will have a nut on the bottom. Raise the bob on the pendulum to speed up time. The opposite is true for slowing time down. Once regulating the clock, it will stay this way for the most part. Some timing may or may not need to be done when the temperature changes vastly.
For the most part, time the clock and it will stay that way within a couple of minutes a day all year long. The adjustable pendulum bob comes in three sizes, or bob diameters. The middle or smaller diameter bob is fine for most clocks because the weight is not as important as the length.
Parts available to purchase
Other parts to consider besides the double end clock keys. We have two styles of the adjustable pendulum bobs. One of them is the three sizes of bobs that have the nut underneath. We call this the Adjustable Mantle Clock Bob.
There is another style bob that is adjustable from the back side. We just call it the Adjustable Antique Style Mantle Clock Bob. They both function the same, it has a bob on the pendulum that can regulate the time.
The part they hang onto is usually a long wire with flex spring steel on the top. This gets bent and cut into shape for the proper length. It comes in a three pack and we call them the Long Suspension Spring Rods.
Clock Key Size Chart Explanation
- 1.75mm = 000 Key
- 2.0mm = 00 Key
- 2.25mm = 0 Key
- 2.5mm = 1 Key
- 2.75mm = 2 Key
- 3.0mm = 3 Key
- 3.25mm = 4 Key
- 3.5mm = 5 Key
- 3.75mm = 6 Key
- 4.0mm = 7 Key
- 4.25mm = 8 Key
- 4.5mm = 9 Key
- 4.75mm = 10 Key
- 5.00mm = 11 Key
- 5.25mm = 12 Key
- 5.5mm = 13 Key
- 5.75mm = 14 Key
- 6.0mm = 15 Key
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. So how do you use the Clock key size chart to get the right key?
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.
Key Description
This key is for winding up a wall or mantle mechanical clock movement. See instructions on the top tabs for how to get the right size key for your clock. Most post 1960 mechanical clocks, made in Germany, take a size #8 key or crank. This is for the most part always true with the exception of round movements, these take size 4.
Clock Key Size Chart Explanation
- 1.75mm = 000 Key
- 2.0mm = 00 Key
- 2.25mm = 0 Key
- 2.5mm = 1 Key
- 2.75mm = 2 Key
- 3.0mm = 3 Key
- 3.25mm = 4 Key
- 3.5mm = 5 Key
- 3.75mm = 6 Key
- 4.0mm = 7 Key
- 4.25mm = 8 Key
- 4.5mm = 9 Key
- 4.75mm = 10 Key
- 5.00mm = 11 Key
- 5.25mm = 12 Key
- 5.5mm = 13 Key
- 5.75mm = 14 Key
- 6.0mm = 15 Key
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. So how do you use the Clock key size chart to get the right key?
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.
| Weight | 0.25 lbs |
|---|---|
| Size |
Size 000 ,Size 00 ,Size 0 ,1 ,2 ,3 ,4 ,5 ,6 ,7 ,8 ,9 ,10 ,11 ,12 ,13 ,14 ,15 |
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hi there i recently came across a clock that needs a left handed threaded clock key . ive searched but i cant seem to find an answer , any help would be appreciated
Do not have that one
James Stoudenmire
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I am looking for the key size for Seiko 30 day wall clock 4pc049b
https://www.ebay.com/itm/166324425676?_skw=Seiko+30+Day+Japan+Mid+Century+Modern+Wall+Clock&itmmeta=01JEY3PQTYRCEN3S0X77H95APR&hash=item26b9b553cc:g:mgYAAOSwwM9k6OtY&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKmEGVrudH1gFMvBtbwR%2F1fps596kWCah8%2F41qXjfRvG7b%2BaEMuaEbw%2FcrJ2JxPig7zokd155C7zmd9FbKu1b7yCDhrp6O0WYl7KCKlG2Nbp1BN5UOIJhDoZ1YlFDQRoUaBSWUYRgehkeAJW8Ftbbx1MTKCld4dKczvf9S4Zj6TnMLEQZSiVOcVhfX9vQ4eVTf10hh%2FZz%2B5nCAI2dV%2Fv6VEr%2BO3N3F9V4D6hoVPEOXlh%2Fk0dw0A1OOuPz0x4vrVjvy9kK3SW5QXKhhpueOwaA22rKtilGUuB2KOY5Kko0NfHmg%3D%3D%7Ctkp%3ABk9SR9792sP3ZA
Size 7 is a guess.
James Stoudenmire
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What size key would a clock on a bank vault take circa 1890s
Do not know.
James Stoudenmire
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Might you be able, please, to identify the correct winding key for a Navy Seth Thomas Mark 1 Deck Clock (1941)? Thank you.
ST loved size 7 but that does not mean it is. Really need to measure the flats and use the key chart on this one
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what size key does a 1008 Helmsman – W E 537-001 Seth Thomas clock use? This was my father’s clock in WWII
Usually size 3 for that one
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Hi there, would you know what size key is required for a Rhythm 30 Day Clock – made in Japan in circa 1950.
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What size key do I need for my Baldwin Mantle Clock M110 MAH
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Hi,
Could you please tell me what size clock key I need for a Trend by Sligh, style # 836-168, movement # 106a, pack # 248/29?
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Hi.. i have FRANZ HERMLE IMPERIAL MANTLE CLOCK, with 130 – 070 movement. May i know the size key for this clock?
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I have a mantel clock with the works stamped Cuckoo Clock MFD 1050-020. I need a key. It’s larger size than 3 other clocks I have.
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Thank you so much!
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William
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Thank you James for your help very much appreciated !!
Hi, can you please tell me which size of a winding key I need to get for a UTI delta 7 jewels mantle clock?
Not sure on that one
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Can you please tell me what size key would fit a Vintage Mason and Sullivan Mantel Steeple Clock?
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I have an anniversary clock made in Germany in the 1920’s or 30’s. I have no key with it but I tried a size 8 key, but is to small. Any recommendations or ideas on key size?
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Seth Thomas E15-003
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Hello, i am looking for the Hermle mechanical skeleton 791-081 winding key. Please advise which size and where to buy.
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I have a Seth Thomas Wharton Moon Clock – 1219-000 would you have a key to fit that please????
ST loved size 7 is all I can say from here
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Hi: I have a Korean made wind clock: This clock has Rolens written on Clock Face. It is supposed to run for 31days. Purchased at an estate sale. The strike does not work as the spring has been wound tight. Once the clock was hung on wall, I wound the opening position on the right side as it turns to left to tighten spring. I managed to wind the spring and set time. This clock has run and keeps good time but difficult to wind. The key for this clock is a number 6. 3.75. The clock has run down, and I attempted to wind with the key.
The key seems to be rounded inside the key opening. This key slips on the winding stem / shaft. I want to order a replacement key and think! ?? size 6 should wind this clock.
I would like to know if there is a key that is maybe a half size ie like size 5.5 key number. I am open to suggestions as I would like to have this clock run even thou the striker isnt working. Please offer suggestions. Definately need to have a working key that can wind the stem as the clock has run down and needs to be wound to run. [email protected]
Sorry have no parts for the now obsolete 31 day clocks
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what size key would I need for this clock
https://www.worthpoint.com/worthopedia/aaron-willard-massachusetts-shelf-510280962
if you can tell from description given
Size 8 key, this link
https://www.clockworks.com/product/brass-single-end-clock-key
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I have a Urgos key mantel clock I’m not sure what year I believed to be bought in Germany in the 50’or 60’s what key should I get?
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What size clock key for a Dugena wall clock?
Not sure on that one
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What size clock key for an Ansonia “Ezee-Set” clock?
Do you sell this key?
Yes please order on this very same page please
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Usually size 7 for the Ansonia antique units made prior to 1950
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I have a D&A pendulum wall clock that as near as I can tell takes a 4,5 mm key. Not sure how that corresponds to your size chart. Let me know if that is correct if you can
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need part # 01-53 and 01-54 full size kundo 400 day clock
Sorry do not have these. Best to find a junker on http://www.ebay.com
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My model number is a Seth Thomas E537-001 What key do I need ?
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That key is way too big for that clock in my experience. Seth Thomas, Cat: 1008, Name: Helmsman-W, Model: E537-001 Back to the drawing board I guess.
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My Elgin E-49 Clock needs a crank key. I do not know the size..
Please gives me a suggestion for that clock’s key.
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Good Afternoon. My Clock is Elgin E-49 clock. I do not know the size.
Would U sells me a fits size crank key?
Thank U!!!
From here, not sure.
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Hello Can you help me find the clock key size for Sligh mantel clock – Model 0515-1-AB, Movement 502-2961, Reg 401-137-6636. Thank you, Diane
We have keys at this link
https://www.clockworks.com/product-category/all-clock-parts/clock-keys-and-cranks
Here we have clock keys in all the sizes available. We get many calls asking what key their clock takes and over the phone it is difficult to say you need key size this or that. Do not call. Best to read the below text on how to use the clock keys chart and get the correct sized key to wind your clock.
Most common sizes are as follows, these are the usual sizes and not always the situation every time.
German made round movements Size 3 or 4. If ships bell, size 3, the rest size 4
German made square / rectangle units post WW2 Size 8
German Grandfather clock cranks post WW2 Crank key Size 8
American time / strike units Size 7
Korean / Chinese 31 day units Size 7
Clock key size chart explanation
Clock keys have their 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
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
We have a Mauthe wall clock. The size 8 key is too small. The shafts may be about 5mm, but they are recessed and hard to measure. It was made in Germany and the number 140-93 is on the back. Any idea what size key we need?
Strange, Mauthe loved size 8. Maybe your key is just worn on the inside. Do not know what size from here.
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Victoria & Albert Museum Marie Antoinette clock. Sticker on the bottom brass plate says Crafted in Malaysia. This clock has two shafts that are recessed in the front that appear to be the same size. I am unable to measure the winding shafts because of the recess. Would you know what size key this clock takes ?
Usually size 7 for these
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
Ok, thanks for your reply.
Thanks for the kind of information. I saw it on the clock Hardware website.
I need a winding key for a Seth Thomas E537-001 Helmsman clock. Do you have the key size?
Usually size 7
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Seth Thomas Wharton mantle clock model 1219-000 that I need replacement key. What size key do I need?
It says
Made in Germany for Seth Thomas Division
General Time Corp.
A401-004
two jewels
7210
That one takes the size 8 key
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
Hi,
What are the numbers off of the back plate of the clock movement itself? If it is hard to get to, usually you can stick a cell phone up behind the movement and get a picture of the numbers. Or through the side access panel if there is one.
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Sligh Model 0503-1-HC Mantel clock with Number 068-0018-88. I need a key for this. Do I need any additional information to purchase a winding key?
Size 8 key / crank
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a mantle clock, it is a Linden Black Forest, Cuckoo Clock Mfg. Co. Inc. The #’s on the back is: 341-020, 11 cm, 200.78, I need to find a key. How do I know what size to get?
Size 8 key for that one
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
Hello-
I have a Roehm and Wright stone mantle clock from 1850’s out of Detroit. The clock face has 2 square shapes each recessed in a circle at the 4 and 8 o clock positions which I presume are where the key inserts? Can you tell me the size key to buy? Thanks!
Usually size 7 for that, not always
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Ridgeway Grandfather Clock and the
key has been lost. I found this # on the clock 90839932. Can you assist me in getting a replacement key?
Door key or clock crank?
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Seth Thomas mantle clock. Would that be an 8 key? The rapidly cracking key I have is HR 75-274 West Germany even though the clock says made in U.S.A.
Yes, unless it is a round movement. If square or rectangle it will take size 8 key
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Howard Miller Bellingham Mantle Clock and I need a key for it. What size do I need?
Usually size 8 for that one
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Seth Thomas Legacy IV mantel clock. On the directions in the back of the clock it has the number 7210. On the works of the clock it states “ Made in Germany for Seth Thomas division general time corp. A 403-001 two (2) jewels. 7206. Catalog #1301 1303.” I need a replacement key. Please advise which key will work. Appreciate it.
Hi,
Size 8 key for that one
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have an Enfield mantle clock made in U K. What Size key doI need?
Dont know that one.
Our full range of clock keys and cranks, along with informational help tabs are located at this link
https://www.clockworks.com/product-category/all-clock-parts/clock-keys-and-cranks
In order to get the correct key size you need to measure the shaft in which the key is to go on in millimeters. Then match that up with the key size chart, this link
https://www.clockworks.com/posts/clock-key-size-chart-to-get-the-right-key
If having a hard time measuring, some choose the 5 prong key set that covers most sizes
https://www.clockworks.com/product/5-prong-clock-key-set
Here is some more info on how to find the right clock key
https://www.clockworks.com/posts/how-to-get-the-right-mechanical-clock-key
We offer the most popular single end brass key at this link
https://www.clockworks.com/product/brass-single-end-clock-key
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Harris & Mallow Product made in Lakewood, NJ what size key does it take?
Not sure what size clock key from here, best to use the key chart
https://www.clockworks.com/posts/clock-key-size-chart-to-get-the-right-key
Here is some info on how to find the right clock key
https://www.clockworks.com/posts/how-to-get-the-right-mechanical-clock-key
We offer a single end key at this link
https://www.clockworks.com/product/brass-single-end-clock-key
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
AWI / BHI / Lifetime NAWCC
Need a key for winding a Sligh mantle clock purchased in the 1980’s. It is two jewels and the numbers 1050-021 are written inside. I read the chart you provide but unsure how to determine the shaft length. Thanks in advanve
Hi,
Takes size 8 key
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I have a Welby windup clock dated 1942. German made. Which key do I need please?
Usually size 8
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
Thank you
Perfect! Thanks clockworks.
Size needed for Scottish drumhead 8 day grandfather clock?
Hi,
I cant say from here, but usually the GFs really liked the size 8 crank
Hi
We have keys at this link
https://clockworks.com/clock-parts/clock-keys.html
Here we have clock keys in all the sizes available. We get many calls asking what key their clock takes and over the phone it is difficult to say you need key size this or that. Do not call. Best to read the below text on how to use the clock keys chart and get the correct sized key to wind your clock.
Most common sizes are as follows, these are the usual sizes and not always the situation every time.
German made round movements Size 3 or 4. If ships bell, size 3, the rest size 4
German made square / rectangle units post WW2 Size 8
German Grandfather clock cranks post WW2 Crank key Size 8
American time / strike units Size 7
Korean / Chinese 31 day units Size 7
Clock key size chart explanation
Clock keys have their 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
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
I purchased this clock on line and it was loosing 2 minutes a day. I took 2 of the weights out put the balance wheel back in the clock
I don’t know what i did but the balance wheel will not run at all. any suggestions p-lease.
Well, I was told by these clocks experts that If your mantel clock is losing around 2 minutes a day to remove about
two small weights on the balance wheel. It seems like there is not much information on Balance wheels as there is on
pendulums.I prefer a pendulum because it is easier to adjust the time on the clock. just turn a nut at the bottom.
where as you have to take the balance wheel apart if it is losing or gaining a lot of time.So now after removing two weights
and putting the balance wheel back in the clock the clock fails to run.
Hi,
Mantle clocks do not take weights, unless it is an OGee clock, and these do not have a balance. The terminology is ambiguous and needs clarity, a pic is best.
Balance wheels to have weights on them as temperature compensating screws only and to poise the balance. These are not to be messed with, only time a balance with the method intended either by manipulating the regulator arm if platform style, or the screw if floating style.
Best to email a pic so I can help by seeing what you have and I will provide the best course of action to time the clock, no charge.
Clockworks@clockworks.com
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
Iam confused by the terms used. You say it is weight driven, but it is very unusual to have a weight driven clock with a balance escapement. Please clarify the issue.
Can you email some pics of the movement to us? It is clockworks@clockworks.com
We will quote for a new one if available, and if not offer our repair service
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
We have a Hamilton 2 jewel mantle clock made in Germany that we need a replacement key for! There is an 82 above the word Hamilton & below that is 340-020. The movers lost the key to it & it is no where to be found!
Hi,
Takes a size 8 key
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
Thank you so much! You’re the best!!
Hello, I have a Seth Thomas model 890 and can’t find the key. Looking for the right size
Usually size 7 for those
https://www.clockworks.com/?post_type=product&s=Key
James Stoudenmire
30yr Clockmaker
Author of Clockworks.com
Thank you