A rod end bearing, also known as a heim joint or rose joint, is a mechanical articulating joint. Such joints are used on the ends of control rods, steering links, tie rods, or anywhere a precision articulating joint is required. A ball swivel with an opening through which a bolt or other attaching hardware may pass is pressed into a circular casing with a threaded shaft attached. This rod end bearing has M4 threading. The rod end joint ball head has a diameter of 4mm.