Insulation hanger with locking device

An insulation hanger for supporting a compressible insulation blanket upon a supporting wall which is formed of three pieces, the first of which is an end weldable stud welded to the supporting surface and upon which the blanket to be secured is impaled. The end weldable stud includes a plurality of annular grooves of reduced cross section providing a shoulder at the juncture between the groove and the body of the stud. A flat washer like blanket retainer is utilized which has a keyhole aperture which permits the retainer to pass over the stud through a larger hole to compress the blanket and thereafter to be moved translationally to an aperture of size approximating the groove to interlock the blanket retainer with the shoulder of the stud. A retainer lock is positioned over the stud between the blanket and the retainer and, through various configurations, locks the blanket retainer against translational movement relative to the stud preventing unintentional disengagement of the blanket retainer from the stud.