Fastening assembly

A fastening assembly adapted to be inserted through a mounting opening in a wall of a constructional member, the fastening assembly comprising:

• a bolt having an at least partially threaded bolt shank and a bolt head,
• an expansion sleeve fitted in use over at least a part of the bolt shank and having deformable wall segments;
• a washer arranged over the bolt shank and adapted to engage a wall surface of the constructional member or another component to be attached to the constructional member;
• a wedge member arranged between the washer and the expansion sleeve and having a wedge portion adapted to be inserted in one end of the expansion sleeve;
• a threaded nut arranged on the threaded portion of the shank and adapted to cooperate with the bolt to tighten the washer and the expansion sleeve towards each other so as to pull the wedge portion of the wedge member into the expansion sleeve resulting in the wall segments being pushed outwardly,
• wherein
• the expansion sleeve is a metal part, wherein the wall segments of the expansion sleeve have an inner side with an inner side surface adapted and arranged to engage a wall surface surrounding the opening in the wall of the constructional member opposite the washer when tightening the fastening assembly to a tightened state,
• wherein the expansion sleeve is formed as a metal base strip and has four adjacent straight lips connected to and extending from the base strip, said lips being separated by a longitudinal gap, wherein the base strip is formed into an annular shape, wherein the base strip is folded into a rectangular shape, in which the corners are located at the level of the gaps.