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- High Precision Jinan Black Granite Surface Plates: Anti-Corrosion & Stable
High Precision Jinan Black Granite Surface Plates: Anti-Corrosion & Stable
High Precision Jinan Black Granite Surface Plates: Anti-Corrosion & Stable
Our high precision granite surface plate are made of high quality Jinan Black granite.Due to their high precision,long duration,good stability and corrosion resistance,they have been more and more used in product inspection of modern industry and such scientific areas as mechanical aerospace and scientific researches.

1.Physical Properties of Jinan Black Granite
| Property | Value |
| Specific Gravity | 2970 – 3070 kg/m³ |
| Compressive Strength | 245 – 254 MPa |
| Elastic Modulus | 30 – 50 GPa |
| Linear Expansion Coefficient | 4.61×10−6/∘C4.61×10−6/∘C |
| Water Absorptivity | ≤0.07%≤0.07% |
| Shore Hardness | >70Hs>70Hs |
2.Our granite measuring tools have the following characteristics:
1)High precision reliable stability resistant to deform and guaranteed accuracy under normal ambient temperature.
2)No-rust and anticorrosion.
3)Wear resistance long service life.
4)Any cutting or scraching for working surface does not bring about rough edges which might influence its measuring precision.
5)Non magnetization.
6)Glossy surface without sluggishness when the workpieces or tools are moving on it.
3.The standard precision grade for Granite Surface Plate:
(Where L is the length of the diagonal in mm)
| Grade | Flatness Tolerance Formula (μmμm) |
| 000 | (0.003×L+2.5)/4(0.003×L+2.5)/4 |
| 00 | (0.003×L+2.5)/2(0.003×L+2.5)/2 |
| 0 | 0.003×L+2.50.003×L+2.5 |
| 1 | 0.006×L+50.006×L+5 |
4. Our Manufacturing Capabilities
Maximum Dimensions: 8000mm (W) × 10000mm (L).
Custom Processing:
Modifications based on customer drawings are accepted., including:
1.Drilling
2.Glue inserts
3.T-slots (glued)
4.Other specialized machining


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