the subject matter of the invention relates to an assembly system with fastening stud as well as to a method of forming an assembly system . the assembly system comprises a fastening stud and an assembly part mounted on the fastening stud . the assembly part has a receiving space for receiving the fastening stud . when the assembly part has been mounted , the inner surfaces of the receiving space and the outer surface of the fastening stud are frictionally connected to one another . the fastening stud has a frontal opening . the fastening stud is radially resilient at least in the region of the opening . the assembly system comprises a clamping member which , after the assembly part has been mounted onto the fastening stud , is movable from a first position outside of the fastening stud into a second position inside the fastening stud so that the clamping member in the second position is insertable without clearance or with little clearance into the opening .