Abstract: A series of adjacent grooves with mutually equal pitch are produced by a broaching process wherein two adjacent grooves are simultaneously produced in one broaching stroke by means of two broaching tools, one of which performs the preliminary broaching of a first groove and the other of which performs the finish broaching of a second groove which was preliminarly broached on a previous stroke. A preferred device for execution of the process is formed by utilization of a broaching girder which secures a T-shaped supporting strip, and wherein two tools, one a preliminary broaching tool and the other a final broaching tool, are secured in the angular position of the pitch of the grooves to be produced between respective sides of the T-shaped supporting strip and claws of the broaching girder.