Bridge leveling ruler
Made according to standard JB/T7977-99, material HT250, Working surface made by skiving, Used to test the straightness and flatness of workpiece. Working environment temperature (20 ± 5) ℃。
| Type (mm) | Straightness and flatness of working surface | ||
| Precision grade ( μm) | |||
| 0 | 1 | 2 | |
| 500 × 50 | 3 | 6 | 12 |
| 750 × 50 | 4 | 8 | 15 |
| 1000 × 50 | 10 | 20 | |
| 1600 × 70 | 15 | 30 | |
| 2000 × 80 | 18 | 36 | |
| 2500 × 90 | 22 | 44 | |
| 3000 × 100 | 52 | ||
| 3500 × 100 | 60 | ||
| 4000 × 100 | 68 | ||
| 5000 × 110 | 84 | ||
| 6300 × 120 | 105 | ||
| 8000 × 120 | 132 | ||
