A rod end bearing, also known as a heim joint (N. America) or rose joint (U.K. and elsewhere), 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.
 
Features:
 
With a M4 threaded shaft, compatible with most Makeblock components
Designed to support high loads, reversing loads, and shock loads. Widely used in engraving machines, automation equipments, CNC equipment.
Rolling bearing seat material : cast iron
Rod end joint bearing ball head diameter is 4 mm
Sold in pack of three