- Measure pitch diameter of screw threads
- Graduation 0.01mm
- Non-rotating spindle
- Ratchet stop
- Supplied with 60° setting standards
- Optional accessary: 55° setting standards, measuring tips (code 7381, previous page)
| Code | Range | L | b | 55* setting standard code(optional) |
| 3281-25A | 0-25mm | 42 | 26 | – |
| 3281-50A | 25-50mm | 67 | 38 | 3281-SP1 |
| 3281-75A | 50-75mm | 92 | 50 | 3281-SP2 |
| 3281-100A | 75-100mm | 117.6 | 62 | 3281-SP3 |
| 3281-125A | 100-125mm | 143 | 70 | 3281-SP4 |
| 3281-150A | 125-150mm | 168.2 | 82 | 3281-SP5 |
| 3281-175A | 150-175mm | 192 | 94.5 | 3281-SP6 |
| 3281-200A | 175-200mm | 217 | 107 | 3281-SP7 |
Accuracy of micrometers with tips
| Pitch | Range(0-25) | Range(25-50) | Range(50-75) | Range(75-100) | Range(100-125) | Range(125-100) |
| 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 | 0.020 | 0.023 |
| 2.5~3.5 | 0.016 | 0.019 | 0.021 | 0.021 | 0.023 | 0.025 |
| 4.0~7.0 | – | 0.021 | 0.023 | 0.023 | 0.025 | 0.028 |