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Thread for mechanical and optical instruments.
Very common since approx. 1850. Hamann was a machine manufacturer for lathes in
Berlin.
The flank angle ranges from 50° to 76°
| Major Diameter | Pitch | TPI | Thread Angle |
| mm | mm | ||
| 1 | 3.907 | 6 1/2 | 50° |
| 2 | 3.092 | 8 3/4 | 50° |
| 3 | 2.739 | 9 3/11 | 50° |
| 4 | 1.953 | 13 | 50° |
| 5 | 1.546 | 17 1/7 | 50° |
| 6 | 1.270 | 20 | 50° |
| 7 | 1.154 | 22 | 50° |
| 8 | 0.976 | 26 | 50° |
| 9 | 0.873 | 29 1/13 | 50° |
| 10 | 0.705 | 36 | 50° |
| 11 | 0.635 | 40 | 64° |
| 12tf. | 0.461 | 55 | 50° |
| 12fl. | 0.461 | 55 | 76° |
| 13 | 0.288 | 88 | 50° |
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