Granite Surface Plate Grades

The middle grade plates grade a are often used in inspection areas. Surface plate grades and it s types basic terminology in surface measurement. Asme b89 3 7 defines standardized tolerance grades for surface plates.

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Flatness is define by the distance between peak and depth point of surface.

Granite surface plate grades.

Plates that have ledges are used for clamping purposes only. The highest accuracy plates are called grade aa and they are often found in calibration laboratories. Our granite surface plates are manufactured in three ledge types as well as standard sizes and grades. Laboratory grade aa and a room inspection grade b and the fourth is workshop grade.

The overall flatness specifications of standridge granite products meet and surpass the requirements set forth by the federal. There are four grades of surface plates. Types of surface plate. Grade s aa and a are the flattest with a flatness tolerances better than 0 00001 in for a grade aa plate.

Grade b plates are the lowest accuracy plates and they might be found on shop floors. 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.