Abstract: The present invention relates to a fastening device for installing a gas or a liquid conducting pipe (10), to a lateral supporting track (13) having a transverse cross section shape of inverted U with inwardly bend ends (15, 16) near its opening, comprising: a body made of two substantially identical parts (8) and a bolt (19) for connecting and fastening them to each other at their upper part (17, 18). Each of said identical parts has two parallel side walls (5, 6) which are interconnected only in their upper ends (17, 18) and their bottom ends (4, 9) are free with a gap (7) between them for the passage of the pipe. The two identical parts are connected to each other by adjusting the bolt which passes through a hole (1) in each part. The fastening device, according to the present invention, can be manufactured in many ways, in various sizes, and from various materials, according to the fastening requirements in various systems.