The description is directed to a snap fastening for fast mounting of fittings such as socket wrench latches, swivel lever latches, hinge parts in openings in a thin wall, comprising a head part which is to be arranged on one, outer side of the thin wall and which overlaps the outer rim of the opening, and a body part which proceeds from the head part and projects through the opening in the mounted position, and holding elements which project from the body part and are flexible in direction of its outer surface, the free end of these holding elements being provided with a first inclined surface (run-in bevel) such that the holding element is pushed back in a spring-loaded manner by the opening edge and with a second inclined surface (stop bevel) for supporting the body part without play on the rim or edge of the opening of the other, inner side of the thin wall, which second inclined surface is substantially perpendicular to the first inclined surface. According to the invention, the body part and holding element and spring are separate parts.