"flat keys" in German flat keys B-Tonarten Flachkeile Wohnungsschlüssel Detailed translations for "flat keys" flat keys 1. music flat keys B-Tonarten{masculine plural} 2. other flat keys Flachkeile{masculine plural} flat keys(also: key to the flat/apartments, apartment keys) Wohnungsschlüssel{masculine plural} The flat keys will always be in the letter box. Source: opensubtitles.org Corpus by OPUS Request review Die Wohnungsschlüssel bleiben immer im Briefkasten.