Ground thread taps for ISO metric threads of tolerances 7G, 8G and special tolerances, coarse and fine pitches – Part 4: Manufacturing tolerances on the threaded portion
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1994

Ground thread taps for ISO metric threads of tolerances 7G, 8G and special tolerances, coarse and fine pitches – Part 4: Manufacturing tolerances on the threaded portion
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2012