Inspection grade "A" granite surface plate has a bilateral accuracy range which is the difference between the highest and lowest peaks when checking the surface contour on flatness. Granite surface plates meet or exceed Federal Specifications GGG-P-463C.
Granite Plates are harder than steel, non magnetic, least responsive to temperature changes, practically maintenance free and won't corrode like steel. Available with ledges for clamping purposes or without ledges. Includes a certificate of inspection. Shars Brand surface plates have same accuracy as USA and Japan Brand.Extra cost for NIST traceable. The following list is surface plate with NIST traceable certificate. The item "2Pcs 1/3'' Shank Canoe Flute and Bead Router Bit Cutter Woodworking Tool US FF" is in sale since Friday, October 23, 2009. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Metalworking Tools\Metalworking Inspection & Measurement\Surface Plates". The seller is "discount_machine" and is located in Saint Charles, Illinois. This item can be shipped to United States, Canada.