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High Precision Granite Surface Plate for Mechanical Calibration & Measurement
High Precision Granite Surface Plate for Mechanical Calibration & Measurement

We can produce various types of precision granite surface plates according to customer requirements. The weight of a plate can be calculated by multiplying its volume and the density of the granite.
Granite surface plates are essential tools in mechanical manufacturing and measurement. They are primarily used as:
1 Reference Plane or Datum Line: For inspecting and calibrating the dimensions of mechanical workpieces.
2 The flatness of the plate is the core indicator determining measurement accuracy. It typically has strict tolerance requirements corresponding to different precision grades.
Material selection of precision granite flat plates: In order to ensure that the quality of our products meets the customers’ requirements, and to guarantee that the products we produce and sell can be used by customers for a long and stable period, Shangdong Sincere Precision Machinery Company carefully selects and uses high-quality natural granite (e.g., Jinan Black, South African Black) as raw materials, with uniform mineral distribution, ensuring a homogeneous structure and stable performance.

The physical parameters of granite are as follows for reference:
| Specification of the granite material | ||
| 1 | Specific Gravity | 3.08 g/cm3 |
| 2 | Hardness | ScalarScopes over 90 |
| 3 | Modules of Elasticity | 9.0 to 12.0 x 105kg/cm2 |
| 4 | Moisture of absorption | Nil |
High-quality natural granite has an extremely low thermal expansion coefficient (approximately 0.5–1.0 × 10⁻⁶/℃), a high density (approximately 2.6–2.8 g/cm³), a dense structure, and excellent rigidity and damping properties. It is highly resistant to wear and corrosion, and has a very low maintenance cost.
The precision granite surface plate will serve as your solid foundation.
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