Abstract: A pipe or cable clamp for attaching a pipe or cable to a support structure, comprises a base to be mounted to the support structure, and a strap. The strap comprises two legs interconnected by a clamp portion. The base has lateral walls being provided with outwardly extending teeth and the legs of the strap, on their side facing inwards, are provided with a series of inwardly extending teeth adapted for a locking engagement with the teeth of the base to couple the strap to the base. The inwardly extending teeth and outwardly extending teeth are arranged such that during mounting, when the clamp portion is pushed towards the base, the inwardly extending teeth on the legs slide along the teeth on the base in a ratchet-like manner. In a pre-assembly state one of the legs of the strap is connected to the base by a frangible hinging connection.