Abstract: A push button type fastener for releasably joining together two panels. A stud assembly is snap-fit to one panel, and a mating socket is snap fit to the other panel. The stud assembly and the socket are releasably secured to each other merely by pushing a stud of the stud assembly toward the socket, which includes two resilient arms that move apart to receive and lock onto a thin wall portion at the stud's remote end. The stud assembly is released from the socket by rotating the stud such that the thin wall portion spreads apart the two resilient arms of the socket, to allow a spring to urge the stud out of it engagement with the socket.