The core advantages of this granite square box lie in its ultra-high multi-angle measurement accuracy and durable performance. It is processed from integral granite blocks without splicing, avoiding the error caused by combined assembly. Each surface of the square box undergoes precision lapping treatment to ensure that the flatness reaches Grade 0, and the squareness between adjacent sides is less than 0.3μm per meter, which can meet the most stringent precision measurement requirements in the aerospace and precision electronics industries. It is equipped with a reinforced base structure to improve stability during use, and the surface is coated with a protective film to avoid scratches during transportation and storage, effectively extending the service life of the product.
Specific parameters of this granite square box include: material is natural deep-mine granite with a density of 2.65g/cm³; accuracy grade is 00 level; side length is 200mm; flatness of each surface is Grade 0 per GB/T 20489-2006; squareness between adjacent sides is ≤0.3μm per meter; total weight is 18kg; surface roughness is Ra0.8μm; it is equipped with 4 adjustable support feet for convenient leveling during installation; packaging uses moisture-proof foam and reinforced wooden crate to avoid damage during long-distance transportation; each product is equipped with a factory calibration report for traceable measurement.
This granite square box is mainly used in instrument calibration, precision machining, aerospace manufacturing, and automotive component processing industries. It can be used to detect the squareness of mechanical parts, inspect the flatness of machine tool workbenches, calibrate other right angle measuring tools, and verify the accuracy of three-coordinate measuring machines. It is especially suitable for high-precision measurement workshops that require strict multi-angle measurement accuracy, replacing traditional cast iron square boxes that are prone to rust and deformation.
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