- M6*0.25 super fine screw thread provides more accurate adjusting functions , detachable the hand wheel . This series of fine adjustment screw thread pairs are interchangeable with micrometers.
- Pitch: 0.25mm
- Resolution:0.001mm

| Model | BY-OA261 | BY-OA271 | BY-OA262 | BY-OA272 |
| Travel | 6 | 13 | ||
| L | 20 | 27 | ||
| Comment | Ball head | Flat head | Ball head | Flat head |

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