Specification :

Applications: The surface use scratching technology and it can be used in any kinds of testing work and can measure parts precisely .At the same time , it can be used to test and measure benchmark, test parts' size precision and deviation and scribe lines.The feature s of it are high precision and wear-resistant.
Material: Made from closed grained cast iron of HT 200-300 .
Hardness between 170-240 BHN
Two times manual processing ( Artificial annealing 600  -700 and natural aging about two or three years) make the precision more accurate.

Precision: Generally as per JB/ T7974-99.Flatness accuracy as per Gr0 , Gr1, Gr2, Gr3 of JB/ T7974-99
Spercification: 300mm-3000mm( we can produce and process these products according to the customers’ drawings or requirements)