Granite square ruler is mainly used for measuring the flatness, verticality, and straightness of workpieces. The main mineral components of granite angle rulers are escape stones, plagioclase, a small amount of olivine, biotite, and trace amounts of magnetite. They have a black color and precise structure. After billions of years of aging, their texture is uniform, stable, strong, and hard, and they can maintain high precision under heavy loads. Suitable for industrial production and laboratory measurement work.
Characteristics and advantages of granite angle ruler:
1. Rocks undergo long-term natural aging, with uniform organizational structure, extremely low coefficient of linear expansion, complete disappearance of internal stress, and no deformation, resulting in high accuracy.
2. Good rigidity, high hardness, and strong wear resistance.
3. Not afraid of acid and alkali erosion, will not rust, does not need to be oiled, is not easy to stick to dust, easy to maintain, and has a long service life.
4. No scratches, not hindered by constant temperature conditions, and able to maintain temperature measurement accuracy at room temperature.
5. Non magnetized, able to move smoothly during measurement, without any sluggishness, not affected by moisture, and the plane is properly weighed.
Specifications（mm) | Measure the perpendicularity of the surface to the base plane（um） | Measure the flatness or straightness of the surface（um） | Flatness or straightness of the base surface（um） | |||
Accuracy level | ||||||
00 | 0 | 00 | 0 | 00 | 0 | |
100×63 | 2 | 4 | 1 | 1 | 1 | 1 |
160×100 | 2 | 4 | 1 | 2 | 1 | 1 |
250×160 | 2.5 | 5 | 1 | 2 | 1 | 2 |
400×250 | 3.5 | 7 | 1 | 2.5 | 1 | 2 |
630×400 | 4.5 | 9 | 1.5 | 3 | 1 | 2.5 |
800×500 | 5 | 10 | 2 | 4 | 1.2 | 3 |
1000×630 | 6 | 12 | 2.5 | 5 | 1.5 | 3 |
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