Size Chart for Keys

To determine the size key you need for your clock consult the chart below. To determine the key size take the measurement of the winding arbor and find it on the chart below. If your buying a key that is using the American scale you would take the size of the winding arbor in mm and look it up on the chart below on a line labeled American. The number above it on the line labeled size would be the size key.

For example if the winding arbor was 4mm and your buying a key that uses the American scale you would buy a size 8. ( Hint: Just because your purchasing from a American retailer/brand does not mean that brand uses the American Scale.)

If the key is Swiss scale you would buy a 7.

Some keys have two ends. Often these are different sized keys but will be the same scale.

Size 5/0
00000
4/0
0000
3/0
000
2/00
00
0 1 2 3 4 5 6 7 8
Swiss Scale 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25
American Scale 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
                           
Size 9 10 11 12 13 14 15 16 17 18 19 20 21
Swiss Scale 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50
American Scale 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6
                           
Size 22 23                      
Swiss Scale 7.75 8.00                      
American Scale 6.8 7.0                      
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