Granite square block
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It is a precise reference measurement tool made of natural granite material.Through the strict phsical test and granite selection,it is extrmetly hard in texture.Therefore,this granite block is an ideal reference plane used for the inspection of precision tools and mechanical parts.It is suitable for inspecting the flatness,verticality of the components,workpieces,guide rails,machine tool table and so on.
| Tpye (mm) | Parallelism of Working surface | Flatness of working surface | Perpendicularity of working surface | |||
| Precision grade ( mm) | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 100 × 100 × 100 | 0.001 | 0.002 | 0.001 | 0.002 | 0.001 | 0.002 |
| 150 × 150 × 150 | 0.0015 | 0.003 | 0.001 | 0.002 | 0.0015 | 0.003 |
| 200 × 200 × 200 | 0.002 | 0.004 | 0.0015 | 0.003 | 0.002 | 0.004 |
| 300 × 300 × 300 | 0.003 | 0.006 | 0.0015 | 0.003 | 0.003 | 0.006 |
| 400 × 400 × 400 | 0.004 | 0.008 | 0.002 | 0.004 | 0.004 | 0.008 |
| 500 × 500 × 500 | 0.005 | 0.010 | 0.0025 | 0.005 | 0.005 | 0.010 |
| 600 × 600 × 600 | 0.006 | 0.012 | 0.003 | 0.006 | 0.006 | 0.012 |
| 800 × 800 × 800 | 0.008 | 0.016 | 0.004 | 0.008 | 0.008 | 0.016 |
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