![]() ![]() Cotters might have a threaded shaft protruding from the narrower end of the taper. Conventionally, it’s been used to attach cranks onto shafts (say, for example, on bicycles and steam engines). ![]() This brings us to the traditional cotter pin, which is a wedge that’s driven or drawn into a hole. Key rings are a common application for this type of fastener although they may also be used to retain pins and shafts. Essentially, it’s a wire loop that extends beyond 360 degrees allowing it to be threaded through a hole. Split ring: These components are also called a circle cotter or cotter ring. A finger can be inserted through the ring at the head to pull the pin out of the hole. The straight section may be pushed through a hole in a shaft, while the curved section clips around the outside of the shaft, retaining the pin in place. They’re sprung pins with a straight section that bends to form a ring at the head, with a curved section offset from the straight pin. R-clips or R-pins: These pins are sometimes referred to as hairpin cotters. The bent end is formed into an enlarged end and the double end can be bent outwards to prevent the pin being removed. The pins are usually manufactured from a half-circular profile so that the two ends together form a circle, which fits into the hole. Split pins: Often called cotter pins, split pins are bent in half so that both ends may be inserted through the same hole. Here are a few of the different types of fasteners that are also considered cotter pins: However, the term “cotter pin” is also sometimes referred to as a split pin, an R-clip, or a circle cotter. The tapered nature of this pin means that it’s compressed as it is driven into the hole, causing friction, which prevents it from working loose. They’re either a wedge or tapered pin that’s driven into a hole. A selection of fasteners that are referred to as cotter pins (from left to right): Traditional tapered cotter as used on a steam engine, a cotter with a threaded section, as used on a bicycle crank, a split pin, an R-clip, and a split ring.Ĭotter pins are typically used to prevent axial movement along a shaft.
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