A screw thread system devised by Dr. Löwenherz in Berlin in 1894. It was used in instruments made in Germany in the late 19th – early 20th century.
| Diameter in millimeters |
Pitch in millimeters |
|---|---|
| 1.0 | 0.25 |
| 1.2 | 0.25 |
| 1.4 | 0.30 |
| 1.7 | 0.35 |
| 2.0 | 0.40 |
| 2.3 | 0.40 |
| 2.6 | 0.45 |
| 3.0 | 0.50 |
| 3.5 | 0.60 |
| 4.0 | 0.70 |
| 4.5 | 0.75 |
| 5.0 | 0.80 |
| 5.5 | 0.90 |
| 6.0 | 1.00 |
| 7.0 | 1.10 |
| 8.0 | 1.20 |
| 9.0 | 1.30 |
| 10 | 1.40 |
| 12 | 1.60 |
| 14 | 1.80 |
| 16 | 2.00 |
| 18 | 2.20 |
| 20 | 2.40 |
| 22 | 2.80 |
| 24 | 2.80 |
| 26 | 3.20 |
| 28 | 3.20 |
| 30 | 3.60 |
| 32 | 3.60 |
| 36 | 4.00 |
| 40 | 4.40 |
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Last revised:3 September 2005.