Abstract: The invention relates to a ring ratchet spanner comprising a ratchet head (1) that is closed all the way round, a lever arm (2) that is seated on the ratchet head (1) and is intended for actuating the spanner, a spanner part (3) that is rotatably mounted in the ratchet head (1), a serrated ring (4) that is provided on the outer circumference of the spanner part (3), and a locking element (5) that interacts with the serrated ring (4). The object of the invention is to create a ring ratchet spanner that can be comfortably placed on any nut and easily actuated when working on a wide variety of pipelines.