Abstract: The device embodying the invention comprises a rigid and good heat conducting frame supporting a printed circuit board, and comprising two posts having two runners susceptible of slidably fitting into two opposite U-shaped slide rails, each runner having two symmetrical ramps on which are applied, due to the action of tightening means generating a relative transversal motion of the wedges, the respective bevelled sides of two mobile wedging blocks, in a direction perpendicular to the plane of the frame. This device is particularly suited to the fastening of printed circuit boards into electronic installations on board aircraft.