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Brass Chronometer Key
Ratcheting Hamilton. Winds counter-clockwise. Size #4 (3.2mm).
Out of stock
$25.50
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Ratcheting Hamilton. Winds counter-clockwise. Size #4 (3.2mm).
Key Sizing Chart
| Key No. | American Sizes | Swiss Sizes | Watch Sizes |
|---|---|---|---|
| #00000 | 1.6mm | 1.25mm | |
| #0000 | 1.8mm | 1.50mm | |
| #000 | 2.0mm | 1.75mm | |
| #00 | 2.2mm | 2.00mm | 2.00mm |
| #0 | 2.4mm | 2.25mm | 1.90mm |
| #1 | 2.6mm | 2.50mm | 1.80mm |
| #2 | 2.8mm | 2.75mm | 1.75mm |
| #3 | 3.0mm | 3.00mm | 1.65mm |
| #4 | 3.2mm | 3.25mm | 1.60mm |
| #5 | 3.4mm | 3.50mm | 1.50mm |
| #6 | 3.6mm | 3.75mm | 1.40mm |
| #7 | 3.8mm | 4.00mm | 1.30mm |
| #8 | 4.0mm | 4.25mm | 1.20mm |
| #9 | 4.2mm | 4.50mm | 1.15mm |
| #10 | 4.4mm | 4.75mm | 1.05mm |
| #11 | 4.6mm | 5.00mm | 1.00mm |
| #12 | 4.8mm | 5.25mm | .95mm |
| #13 | 5.0mm | 5.50mm | |
| #14 | 5.2mm | 5.75mm | |
| #15 | 5.4mm | 6.00mm | |
| #16 | 5.6mm | 6.25mm | |
| #17 | 5.8mm | 6.50mm | |
| #18 | 6.0mm | 6.75mm | |
| #19 | 6.2mm | 7.00mm | |
| #20 | 6.4mm | 7.25mm | |
| #21 | 6.6mm | 7.50mm | |
| #22 | 6.8mm | 7.75mm | |
| #23 | 7.0mm | 8.00mm |
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