Marble (granite) square box

Granite square box (marble square box) is a precision reference measuring tool made of stone material, which is an ideal reference surface for the inspection of instruments, precision tools, and mechanical parts. Granite square box, marble square box, and rock square box are especially used for high-precision measurement.

Granite square box（Marble square box）Its material is Jinan green, granite has a black luster, precise structure, uniform texture, good stability, high strength, and high hardness. The working surface adopts scraping or precision grinding technology, which is suitable for measuring the straightness and perpendicularity of workpieces and equipment installation.
Granite square boxPurpose: To detect the flatness and perpendicularity of components, workpieces, machine tool workbenches, guide rails, and precision work. The granite square boxes produced by our company have the advantages of high precision, rust resistance, acid and alkali resistance, non magnetization, invariance, and good wear resistance. They can also maintain stability under heavy loads and general temperatures.
Granite square box is a precision reference measuring tool made of stone material, which is an ideal reference surface for the inspection of instruments, precision tools, and mechanical parts. Granite square box is especially used for high-precision measurement. The granite square box is made from underground rock layers and has undergone billions of years of natural aging. Its shape is stable and there is no need to worry about deformation due to conventional temperature differences.
The granite square box has undergone strict physical testing and selection of granite materials, with fine crystallization and hard texture. Due to its non-metallic nature, granite has no magnetic reaction or plastic deformation. Its hardness is high, therefore it has good accuracy retention.