A spring device for securing a threaded fastener of a bolted joint. The spring device includes at least one ring-shaped portion and a plurality of elongate spring elements. Each spring element is attached at least in a first end to the at least one ring-shaped portion. The at least one ring-shaped portion and a body formed by the plurality of spring elements have a common centre axis. Each spring element includes an inner peripheral surface directed towards the centre axis, and wherein a first portion of said inner peripheral surface is closer to the centre axis than are other portions of said inner peripheral surface and closer to the centre axis than an inner peripheral surface of the at least one ring-shaped portion. The disclosure further relates to a system for securing a bolted joint.