Abstract: There is disclosed a locking sleeve apparatus for securing rotating connection components. In an embodiment, the locking sleeve apparatus comprises: an elongate tube having an inner profile configured to slidingly engage an outer profile of a plurality of rotating connection components; and one or more locking mechanisms positioned internally in the elongate tube near at least one end of the elongate tube; whereby, the plurality of rotating components are mechanically coupled by the elongate tube, and prevented from rotating relative to each other. The inner profile of the elongate tube matches commonly available rotating connection components with multi-sided outer profiles, such as hexagonal nuts. The rotating connection components are configured to rotate in opposite directions relative to each other to tighten or loosen. The one or more locking mechanisms keep the locking sleeve apparatus fitted over the rotating connection components to prevent loosening.