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Precision Granite Straight Edge for Machine Tool Guide Rails
Precision Granite Straight Edge for Machine Tool Guide Rails

Granite straight edges are high-precision datum measuring instruments fabricated from natural granite.
They are mainly used to detect the straightness and flatness of workpieces, mechanical equipment installation surfaces, machine tool tables, guide rails and other precision parts of the precision machine as the liser machine, coordinate measuring machine (CMM) etc
Material composition: the granite straight edge of Shangdong Sincere Precision Machinery Company Limited is made of high-quality Jinan black granite, which sourced from deep underground strata. After millions of years of natural weathering, the material has excellent dimensional stability and thermal deformation resistance under normal ambient temperature fluctuations.
Material characteristics: Each raw material used for the edges of our precision granite rulers undergoes rigorous physical testing and strict selection to ensure a fine crystal structure and consistent hardness. As a non-metallic and non-magnetic material, granite does not undergo plastic deformation and is not affected by magnetic fields. Its high compressive strength and low thermal expansion coefficient directly contribute to long-term measurement stability and measurement accuracy.
Durability and performance: Even under accidental impact or heavy mechanical load, granite straight edges usually only sustain only minor chipping, which will not affect the functional accuracy. Compared with high-grade cast iron or steel benchmark level ruler, granite straight edges deliver superior dimensional stability, higher initial accuracy and more consistent long-term performance. Independent verification has confirmed that the certified accuracy of the precisision granite straight edges from Shangdong Sinere Precision Machinery Company can remain unchanged for at least 12 months under standard operating conditions.
Features:
- Single-face or double-face configurations available accoring to request;
- Weight-reduction holes incorporated per size-specific engineering requirements;
- Customizable dimensions and metrological grades (e.g., Grade 00, Grade 0, Grade 1) to meet application-specific tolerances.

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