Granite measuring square

Granite measuring square has a vertical and parallel frame combination for the inspection of right angles, which is suitable for the inspection of machinery and instruments with appropriate accuracy and the inspection of non perpendicularity between machine tools

the granite measuring square is processed from naturally grown marble, which is recrystallized limestone and mainly composed of CaCO3. Limestone softens under high temperature and pressure, and recrystallizes to form marble when the minerals contained change. Marble is a metamorphic rock formed by the original rocks in the crust under the action of high temperature and pressure in the crust. The internal force of the earth's crust promotes the qualitative changes of the original rocks, that is, the structure, structure and mineral composition of the original rocks have changed; The new rocks formed by metamorphism are called metamorphic rocks; Marble is mainly composed of calcite, limestone, serpentine and dolomite. Its main component is calcium carbonate, accounting for more than 50%; Because marble generally contains impurities, and calcium carbonate is easily weathered and corroded by carbon dioxide, carbides and water vapor in the atmosphere, the surface will soon lose luster. Marble is mainly used for processing into various shapes and plates; Therefore, the marble square has the characteristics of no deformation, good hardness and actual report; The plane accuracy and perpendicularity standard of marble square is gb6092-85

the granite measuring square is physically stable, the structure is meticulous, the impact grain falls off, the surface does not have burrs, and does not affect its plane accuracy. It can protect the long-term deformation, and the linear expansion coefficient is small. It is suitable for vertical measurement in industrial production

specification of granite measuring square: (special specifications need to be customized)

160 × 160

200 × 200

250 × 250

300 × 300

400 × 400

500 × 500

600 × 600

800 × 800

1000 × 1000