Esslinger Staff
Use the table below to determine the tap size of your watch stem. Measure the diameter the threads on the stem and use the table below to find the corresponding tap size.
| Stem Thread Diameter | Tap Size |
|---|---|
| .60 mm | TAP 13 |
| .70 mm | TAP 12 |
| .80 mm | TAP 11 |
| .90 mm | TAP 10 |
| 1.00 mm | TAP 9 |
| 1.10 mm | TAP 8 |
| 1.20 mm | TAP 7 |
| 1.30 mm | TAP 6 |
| 1.40 mm | TAP 5 |
| 1.50 mm | TAP 4 |
| 1.60 mm | TAP 3 |
| 1.70 mm | TAP 2 |
| 1.80 mm | TAP 1 |
| 1.90 mm | TAP 0 |
