- Measure pitch diameter of screw threads
- Resolution 0.001mm/0.00005″
- Button function: on/off, set, mm/inch, ABS/INC, data output
- Data output
- SR44 or LR44 battery, automatic power off
- Non- rotating spindle
- Ratchet stop
- Supplied with 60° setting standards
- Optional accessary: 55° setting standards, measuring tips (code 7381,previous page), data output cable (code 7306-30, 7302-SPC2A, 7305-SPC3)
| Code | Range | L | b | 55* setting standard code(optional) |
| 3581-25A | 0-25mm/0-1″ | 42 | 26 | – |
| 3581-50A | 25-50mm/1-2″ | 67 | 38 | 3281-SP1 |
| 3581-75A | 50-75mm/2-3″ | 92 | 50 | 3281-SP2 |
| 3581-100A | 75-100mm/3-4″ | 117.6 | 62 | 3281-SP3 |
Accuracy of micrometers with tips
| Pitch | Range(0-25) | Range(25-50) | Range(50-75) | Range(75-100) |
| 0.4~0.5 | 0.01 | – | – | – |
| 0.6~0.8 | 0.01 | 0.013 | – | – |
| 1~1.25 | 0.012 | 0.015 | 0.017 | 0.017 |
| 1.5~2.0 | 0.014 | 0.017 | 0.019 | 0.019 |
| 2.5~3.5 | 0.016 | 0.019 | 0.021 | 0.021 |
| 4.0~7.0 | – | 0.021 | 0.0223 | 0.023 |