The overall flatness specifications of standridge granite products meet and surpass the requirements set forth by the federal.
Granite surface plate grades.
There are four grades of surface plates.
Surface plate grades and it s types basic terminology in surface measurement.
The middle grade plates grade a are often used in inspection areas.
Cast iron surface.
Workshop grades being the least flat and as the name suggests they are intended for use in tool rooms.
Granite surface plate have more rigidity for the same depth with the absence of corrosion.
The highest accuracy plates are called grade aa and they are often found in calibration laboratories.
Grade b plates are the lowest accuracy plates and they might be found on shop floors.
Types of surface plate.
Flatness is define by the distance between peak and depth point of surface.
Grade s aa and a are the flattest with a flatness tolerances better than 0 00001 in for a grade aa plate.
Laboratory grade aa and a room inspection grade b and the fourth is workshop grade.