![]() ![]() The extended prong type is popular because the difference in length of the two tines makes it easier to separate them. The most common type of split pin is the extended prong with a square cut, but extended prongs are available with all of the other types of ends. The length L of the split pin is defined as the distance from the end of the shortest tine to the point of the eyelet that contacts the hole. Types Types of ends available on split pins: Standard, extended prong, mitre end, bevel end and hammer lock. Common materials include mild steel, brass, bronze, stainless steel, and aluminium. Split pins are typically made of soft metal, making them easy to install and remove, but also making it inadvisable to use them to resist strong shear forces. When they are removed they are supposed to be discarded and replaced, because of fatigue from bending. Once inserted, the two ends of the pin are bent apart, locking it in place (figure B). These are not "split" at all and are wedge shaped.Ī new split pin (see figure A) has its flat inner surfaces touching for most of its length so that it appears to be a split cylinder (figure D). A further use of the term "cotter pin" is the "crank cotter pin" used to lock bicycle pedal cranks to the bottom bracket axle. To avoid confusion, the term split cotter is sometimes used for a split pin. The British definition of " cotter pin" is equivalent to US term " cotter". Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types. A split pin (UK usage) / cotter pin (USA usage) holding a rod in place with a washerĪ split pin, also known in the US as a cotter pin or cotter key, is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. For a split pin used in stationery, see Brass fastener.
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