Tolerances on the threaded portion of taps – Part 3: Ground taps for pipe thread (G) according to DIN EN ISO 228-1 and pipe thread (Rp) according to DIN EN 10226-1 – Manufacturing tolerances on the threaded portion
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/2016

Tolerances on the threaded portion of taps – Part 3: Ground taps for pipe thread (G) according to DIN EN ISO 228-1 and pipe thread (Rp) according to DIN EN 10226-1 – Manufacturing tolerances on the threaded portion
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2008