DIN 2174
DIN 2174 Cold-forming taps for ISO metric coarse pitch thread M2 to M39 and ISO metric fine pitch thread M3 × 0.25 to M52 × 4 - Dimensions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2008