Hollow bolt comprising a longitudinal bore and manufacturing method thereof

The This invention relates to a process for the Preparation of a longitudinal bore provided hollow bolts provided with circumferential notches are. The hollow pins are provided with longitudinal grooves between the pin diameter determining elevations extend and with the longitudinal grooves and the surveys provided hollow pin rolled circumferential notches , whereby the longitudinal grooves a have cross-section such that a portion of the rolling of the notches displaced Material into the longitudinal grooves flows.