Prop

A prop comprising a first tube and a second tube, the first tube being telescopically connected to the second tube for axially displacing the second tube between a retracted position and an extended position, the first and second tubes each comprising a loading end for receiving an axial load from opposing load surfaces in the extended position, wherein the first tube and the second tube are made from a plastics material, the prop further comprising a linear actuator to connect telescopically the first and second tubes, wherein the linear actuator is spaced from the loading ends of the first and second tubes when the prop is in the extended position, the first and second tubes electrically insulating the linear actuator from the respective loading ends, wherein the linear actuator comprises a threaded section associated with the first tube, a ring threadingly engaged with the threaded section, and a pin coupled to the second tube for transferring the axial load between the second tube and the ring, wherein the linear actuator comprises a sleeve attached to the first tube, the sleeve comprising the threaded section.