| Granite Measuring Instruments- | |||||||||||||||
| Square rules precision (JB/T 10027 -1999) | |||||||||||||||
| ItemNo. | TYPE | Squareness between adjacent measuring surfaces | Straightness of measuring surface | Parallelism between opposite measuring surface | Squareness between side surface & measuring surfaces | Parallelism of the two side surface | |||||||||
| (mm) | Precision grade (μm) | ||||||||||||||
| 000 | 00 | 0 | 000 | 00 | 0 | 000 | 00 | 0 | 000 | 00 | 0 | 000 | 0 | ||
| GSF001 | 100x100x20 | 0.7 | 1.5 | 3.0 | 0.4 | 0.7 | 1.4 | 0.8 | 1.5 | 3.0 | 8.0 | 15.0 | 30.0 | 18.0 | 72.0 |
| GSF002 | 160x160x25 | 0.8 | 1.8 | 3.5 | 0.4 | 0.8 | 1.6 | 0.8 | 1.8 | 3.5 | 9.0 | 18.0 | 35.0 | 21.0 | 81.0 |
| GSF003 | 200x200x25 | 0.9 | 2.0 | 4.0 | 0.4 | 0.9 | 1.8 | 1.0 | 2.0 | 4.0 | 10.0 | 20.0 | 40.0 | 24.0 | 96.0 |
| GSF004 | 250x250x30 | 1.1 | 2.2 | 4.5 | 0.5 | 1.0 | 2.0 | 1.1 | 2.2 | 4.5 | 11.0 | 22.0 | 45.0 | 27.0 | 108.0 |
| GSF005 | 300x300x30 | 1.3 | 2.6 | 5.2 | 0.6 | 1.1 | 2.3 | 1.3 | 2.6 | 5.5 | 13.0 | 26.0 | 52.0 | 31.0 | 124.0 |
| GSF006 | 400x400x40 | 1.5 | 3.0 | 6.0 | 0.6 | 1.3 | 2.6 | 1.5 | 3.0 | 6.0 | 15.0 | 30.0 | 60.0 | 36.0 | 144.0 |
| GSF007 | 500x500x50 | 1.8 | 3.5 | 7.0 | 0.8 | 1.5 | 3.0 | 1.8 | 3.5 | 7.0 | 18.0 | 35.0 | 70.0 | 42.0 | 168.0 |
| GSF008 | 630x630x60 | 2.1 | 4.2 | 8.3 | 0.9 | 1.8 | 3.5 | 2.1 | 4.2 | 8.3 | 21.0 | 42.0 | 83.0 | 50.0 | 199.0 |
| Notes: On inspection of verticality and parallelism as well as absolute 90°measuring | |||||||||||||||
