Abstract: A blind one piece expansible fastener which has a tubular body with an annular flanged head portion at one end thereof. The upper portion of the tubular body which extends from the flanged head portion has a constant wall thickness. The intermediate tubular portion of the fastener which can be upset has its wall thickness increasing towards the lower portion, which lower portion is internally threaded. The intermediate portion is buckled radially outwardly against an apertured work to secure the fastener thereto. The exterior diameter of the tubular body is of a constant diameter.

Abstract: A blind hollow fastener with a slotted head and a depending tubular sleeve with a bore extending therethrough for use on a thin vertically disposed plate. The plate is slotted to receive the fastener with the slotted head engaging the side surfaces of the plate while the upsetting action on the tubular sleeve above its lower internal threaded portion engages notches that extend out away from the slot in the plate.