China Cast Iron Straight Ruler, Find details about China Cast Iron Straight Ruler, Straight Ruler from Cast Iron Straight Ruler
The cast iron straight edge made of HT250 is in line with the GB/6318-85 standard. Its working surface could be made through the scraping or precise grinding process. Both working surfaces can be used in combination with the block gauge, micrometer, gradienter, or other instrument.
Parameters of Precision Straight Edge| Size(mm) | Straightness or Flatness of Working Surface | Parallelism Between Both Working Surfaces | ||||
| Precision Degree(μm) | ||||||
| 0 | 1 | 2 | 0 | 1 | 2 | |
| 500 × 35 | 3 | 6 | 12 | 4.5 | 9 | 18 |
| 750 × 40 | 4 | 8 | 15 | 6 | 12 | 25 |
| 1000 × 50 | 5 | 10 | 20 | 7.5 | 15 | 30 |
| 1250 × 50 | 12 | 24 | 18 | 36 | ||
| 1600 × 70 | 15 | 30 | 20 | 40 | ||
| 2000 × 80 | 18 | 36 | 27 | 54 | ||
| 2500 × 80 | 44 | 65 | ||||
| 3000 × 100 | 52 | 78 | ||||
| 3500 × 100 | 60 | 90 | ||||
| 4000 × 100 | 68 | 100 | ||||