The cast iron surface plate serves as the measuring basis, which is used for inspecting the machinery parts`geometric tolerance such as flatness ,straightness ,etc.Also, it can be used to the scribbling , abrasive machining equipment installation and more.

The raw material of the cast iron surface table is the high -strength cast iron HT200-300 ，whose surface hardness is of HB170-240.After the two manual handing such as 600℃ to 700℃ artificial annealing as well as 2 to 3 years of natural aging, the T-slot has plate perfectly resists abrasion and has stable precision.

Precision accuracy:surface plates shall be classified as Grade 00,Grade0, Grade 1.Grade 2.Grade3 ,and finish polishing.

We can use the coloring method to insepct the flatness ,which is accurate , direct ans convenient.