This document provides information about knuckle joints. It begins by defining a knuckle joint as a connection between two or more rods that allows for a small angular movement between the rods. The major components of a knuckle joint are then listed as the single eye end, double eye end, knuckle pin, collar, and tapper/split pin. Diagrams are included to illustrate these components. The document goes on to discuss the assembly of a knuckle joint and potential failure modes, including failures of the single eye in shearing or tension and failures of the forked end in tension or shearing. Applications for knuckle joints include elevator chains and valve rods. The presentation concludes with acknowledgments.
