Socket and spigot Cotter joint for 20mm dia shaft
grabcad
A cotter consists of a rectangular shape with uniform thickness and varying width, featuring one long side tapered and another straight. Correspondingly, spigot rod and socket slots are slightly larger, exhibiting the same profile - one side straight, the other tapered. The taper on the cotter helps secure both rods; however, excessive tapers should be avoided. A suggested 1:30 ratio is ideal for general use, while a greater taper necessitates an additional locking mechanism to prevent slipping.
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