Abstract: A locking device for a component having at least one and preferably two threaded fasteners is provided. The device includes a first clamping section configured to be secured around a first threaded fastener, and a second clamping section at a spaced location from the first clamping section arranged to be secured around a further element relative to which the first fastener is rotational. The second element may be a second threaded fastener, or a fixed feature such as the body of a pipe coupling. A bridging element is also provided that connects the two clamping sections and prevents rotation of the first and second clamping sections relative to each other. The clamping sections are configured to surround, compress and/or deform against the circumferential surface of a part of the fastener, which may be a nut or a bolt head, such that the clamping section is rotationally fixed relative to the fastener.