ISO 3650:1998

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ISO 3650:1998 is an international standard that defines the geometrical product specifications, specifically length standards, including gauge blocks. It outlines the design, metrological characteristics, and tolerances for gauge blocks with rectangular cross-sections and nominal lengths from 0.5 mm to 1000 mm. The standard also specifies deviations and tolerances for different accuracy grades, including grades K, 0, 1, and 2, for various measuring purposes.