Abstract: A hooking device for conveyor roller comprises an internally threaded casing, the bottom of which is fitted externally with a hook, and a hollow roller holding nut provided with an external thread adapted to screw into the inside of the casing. The hook of the casing is provided with parallel outwardly protruding stiffening membranes and the casing and nut are in moulded plastic material. The plastic material preferably comprises fibreglass filler to a content advantageously greater than 30%.