Granite Surface Plate Pink AA 12x18x4

Granite Surface Plate, Pink, No Ledge, Grade AA Laboratory, Surface Size (In.) 12 x 18, Surface Size (mm) 300 x 450, Thickness (In.) 4, Thickness (mm) 100, Flatness Unilateral Tolerance (In.) 0.000050, Flatness Unilateral Tolerance (mm) 0.0012, Weight (Lbs.) 85, Weight (Kilograms.) 39 Crystal Pink Granite Surface PlatesGrade AA Laboratory plates are for precision operations in constant temperature gaging rooms and metrology departments. Grade A Inspection plates are for general quality control work. Grade B Toolroom plates are for production checking work throughout a shop. 2-ledge plates have a 2" deep undercut on long sides for clamping.Calibration is NIST certified. Meet U.S. MIL-I-45208A and Federal Spec. GGGP-463c for flatness.