Clock Key Size Chart
| Size | Swiss | American |
| 000 | 1.75mm | 2.0mm |
| 00 | 2.00mm | 2.2mm |
| 0 | 2.25mm | 2.4mm |
| 1 | 2.50mm | 2.6mm |
| 2 | 2.75mm | 2.8mm |
| 3 | 3.00mm | 3.0mm |
| 4 | 3.25mm | 3.2mm |
| 5 | 3.50mm | 3.4mm |
| 6 | 3.75mm | 3.6mm |
| 7 | 4.00mm | 3.8mm |
| 8 | 4.25mm | 4.0mm |
| 9 | 4.50mm | 4.2mm |
| 10 | 4.75mm | 4.4mm |
| 11 | 5.00mm | 4.6mm |
| 12 | 5.25mm | 4.8mm |
| 13 | 5.50mm | 5.0mm |
| 14 | 5.75mm | 5.2mm |
| 15 | 6.00mm | 5.4mm |
Measure across one side of the flat to determine size
-
668 Taylor
~~Taylor clock key~~OD: .275/7.0 mm~~ID: .151/3.9mm
-
670 Taylor
670 Taylor~Clock~Tool~~OD: .23/5.8 mm~~ID: .115/2.9 mm
-
671 Taylor~Limited Stock
~~Clock key~~OD: .200/5.1 mm~~ID: .100/2.5 mm
-
BD539
Clock #5 American~3.4 mm
-
BD540
Clock~~#6 American~3.6mm
-
BD561~Discontinued
Watch Star~Odd Sizes~#3-#5-#7-#9-#11 (1.65mm-1.5mm-1.3mm-1.15mm-1mm)
-
BD563
Clock~Long Neck American/Swiss #3~3mm
-
BD564
Clock~American/Swiss #3~3mm
-
BD565
Clock~American/Swiss #2~2.8 mm
-
BD566
Clock~Swiss #5~3.5mm
-
BD567
Clock~Swiss #12~5.25mm
-
BD568
Clock~American #11~Swiss #9~4.6mm
-
BD669
Clock~~Side 1- OD: .338/8.6 mm~~ID: .151.3.8 mm
Side 2- OD: .207/5.3 mm~~ID: .075/2.0 mm -
BD960
Clock Star – American Sizes 3-5-7-9-11
-
BD961
Clock Star – American Sizes 4-6-8-10-12
-
BD962
Clock~American #4~3.2mm
-
BD963
Clock~American #7~3.8mm
-
BD964
Clock~American #8~4mm
-
BD965
Clock~American #9~4.2mm
-
BD966
Clock~American #10~4.4mm