black surface plate

made of high quality "jinanqin"granite . Specific granvity:2970-3070kg/m^3. Compression strength :245-254N/mm^2.

Our main products are granite inspection tables, squares, straight edges, square rulers, parallels, V-blocks, and granite components for high precision equipment such as granite bases and guide rails. Our machinery equipment can also finish the process of drilling holes, having slot and bonding inserts according to customers' requirements. Our granite surface table is calibrated according to JB/T7975-1999 and JJG117-91 standards and we can also make the granite measuring tools according to different  countries' standard.

 physical properties of JiNan Black :

Specific granvity:2970-3070kg/m^3.

Compression strength :245-254N/mm^2.

Elastic modulus:1.27-1.47 N/mm^2.

Linear expansion coefficient:0.0000461%(4.61*10^-6).

Water absorbtivity<0.13%.

Shore hardness :above Hs70.

Granite measuring tools have the following characteristics

1.       high precision reliable stability resistance to deform and guaranteed accuracy under normal ambient temperature.

2.   No-rust and anticorrosion.

3. wear resistance long service life.

4.   any working surface cutting or scratching dose not bring about rough edges which  might influence its measuring presicion.

5.       non-magnetization.

6.    gloosy surface without sluggishness when the workplaces or tools are moving on it .

   

     

black surface plate