Socket and Spigot cotter joint, Assembly of Socket and Spigot joint, Spigot & Socket joint

Socket and Spigot Cotter Joint is connecting two rods in such a way that it can transfer axial compression or tensile load. In this case, one end of the first rod is enlarged in diameter to some length, just to compensate for the loss of material due to rectangular hole made in it to accommodate a cotter. A collar is provided at the end of the enlarged end of the spigot. The one end of the second rod is formed into a socket or box having an appropriate inner diameter to fit the spigot along with a collar, for a very simple construction socket can be considered as a hollow pipe having one side solid and the other hollow, while the spigot is a solid rod, the solid spigot is near to the size of the internal radii of the socket, where it can fit. Once they are fit, consider that a rectangular cavity of tapering construction through both the parts, i.e., spigot and socket. This cavity or slot is kept slightly out of alignment so that driving in of the cotter tends to pull the slots in a line, thus making the joint perfectly tight and rigid. A clearance of 2 to 3 mm is made in these joints for the proper functioning of the cotter.
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