Granite Square Box Marble Square Box Rock Square Box

Granite square box is a commonly used measuring tool in granite for detecting the flatness and perpendicularity of components, workpieces, machine tool workbenches, guide rails, and precision work.

Granite square boxIts 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 for measuring the straightness and perpendicularity of workpieces and equipment installation.
Purpose: To detect the flatness and perpendicularity of components, workpieces, machine tool workbenches, guide rails, and precision work. Our company producesGranite square boxAnd it has the advantages of high precision, no rust, acid and alkali resistance, non magnetization, invariance, and good wear resistance. Can maintain stability under heavy loads and normal temperatures.
It is a precision reference measuring tool made of natural stone materials, which is an ideal reference surface for the inspection of instruments, precision tools, and mechanical parts,Granite square boxEspecially for high-precision measurement.Granite square boxDerived from high-quality underground rock layers, after billions of years of natural aging, the shape is extremely stable, and there is no need to worry about deformation due to conventional temperature differences.
The granite material selected through rigorous physical testing is finely crystallized and has a 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.
Even if it is bumped by heavy objects during use, at most a few stones will fall off.Granite square boxIt is superior to precision measuring reference parts made of high-quality cast iron and steel, and can achieve high and stable accuracy.

Specification (mm)	parallelism		flatness		perpendicularity
	Accuracy level (um)
	00	0	00	0	00	0
100×100×100	0.001	0.002	0.001	0.002	0.001	0.002
150×150×150	0.0015	0.003	0.001	0.002	0.0015	0.003
200×200×200	0.002	0.004	0.0015	0.003	0.002	0.004
300×300×300	0.003	0.006	0.0015	0.003	0.003	0.006
400×400×400	0.004	0.008	0.002	0.004	0.004	0.008
500×500×500	0.005	0.010	0.0025	0.005	0.005	0.010
600×600×600	0.006	0.012	0.003	0.006	0.006	0.012
800×800×800	0.008	0.016	0.004	0.008	0.008	0.0016