It is named after Dr. Leopold Löwenherz, who was the director of the metrology institute Physikalisch-Technische Bundesanstalt in Berlin.
[5] The Löwenherz fastener is specified for 31 diameters at irregular intervals ranging 1–40 mm, each with a single corresponding pitch.
[6] (This further differentiates the Löwenherz thread from the ISO metric thread, where screws must be specified by both their diameter and pitch because multiple pitches exist for a single diameter.)
[9] In addition to seeing its use in instruments designed in Germany, Austria and France,[10] the Löwenhetz thread was once adopted by the Bureau of Standards in the United States as a solution to the lack of uniformity in the type of screws used in American-made instruments.
In modern applications, the Löwenherz thread has been replaced with the DIN 13 standard for metric screws.