How To Determine Your Clock Key Size

 

In order to get the right size key for your clock you need to measure the size of the shaft in millimeters.

clock key shaft

measuring clock key shaft 1

 

Some clock keys are identified just by the millimeter size, others have a key number (i.e. a 3.75mm is a number 6 key). Use the chart below to help identify which key you need:

Size in Millimeters Key #
1.75 000
2.00 00
2.25 0
2.50 1
2.75 2
3.00 3
3.25 4
3.50 5
3.75 6
4.00 7
4.25 8
4.50 9
4.75 10
5.00 11
5.25 12
5.50 13
5.75 14
6.00 15

 

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