Clamping collar consisting of a metal strip (1) wound around itself and having, close to one of its ends, a lug (2) equipped with an extension (4) and, having a hook (3) at the other end. The extension (4) has a projecting part (4a) of transverse dimensions smaller than that of the free edge (3a) of the hook (3) and capable of interacting with means for pre-attaching the collar in the unclamped state. The free end (3a) of the hook (3) has a notch (5) the dimensions of which are adapted to those of the projecting part (4a) and which is offset (d) relative to the latter in the transverse direction of the strip. A portion (6) of the free edge (3a) of the hook is situated in the alignment of the projecting part (4a) and is capable of being clipped behind the latter. <IMAGE>
