Fastening system and method for mounting in a substrate

A method for mounting a fastening system at a substrate, the fastening system comprising a sleeve and an inner element,

• wherein the sleeve comprises a holding portion, a spreading zone as well as a drill opening at one of the two ends of the sleeve and a tool opening at the other end, wherein the spreading zone is arranged at least partially between the holding portion and the drill opening, and
• wherein the inner element is arranged at least partially within the sleeve and is movable relative to the sleeve, and
• wherein the inner element comprises a drilling portion and a spreading portion, wherein the drilling portion comprises at least one cutting element and the drilling portion projects at least partially out of the drill opening of the sleeve;
• and
• wherein the method comprises the steps of:
• driving the inner element into the substrate and simultaneously carrying the sleeve along with the movement of the inner element until the holding portion of the sleeve opposes a force to further carry the sleeve along;
• and
• further driving the inner element into the substrate, whereby a relative movement is generated between the inner element and the sleeve, and simultaneously spreading the spreading zone of the sleeve with the spreading portion of the inner element by the relative movement.

A method for manufacturing a fastening system for mounting at a substrate, the method comprising:

• providing a plurality of embossing and/or punching tools;
• providing a sleeve blank, the sleeve blank having a substantially cylindrical shape;
• providing an inner element, wherein the inner element comprises a drilling portion and a spreading portion and wherein the drilling portion comprises at least one cutting element arranged thereon;
• placing the first end of the inner element in the sleeve blank;
• circumferentially pressing at least a portion of the sleeve blank onto the inner element and thereby forming a spreading zone in the pressed portion and generating at least one predetermined separation point in the spreading zone formed by the pressing using at least one embossing or punching tool.