![]() They are also used to secure ceiling fans to prevent falling if the mounting nut loosens. They are known as hairpin cotters or R clips. Also known as cotter keys or split pins, they are inserted through holes in clevis. Cotter pins and hairpin cotter pins are ideal for quick assembly. But there are those that look exactly like a beefier hair clip. Clevis pin refers to a type of non-threaded, low cost metal fastener. Hairpin cotter keys, also called bridge pins, hitch pins, or R-clips, consist of a single length of hardened metal wire (in a general letter R shape) they are inserted through cross-holes in standard clevis pines or secured around the groove in a grooved clevis pin. At a glance, cotter pins look like a straight hair clip. Another type of cotter pins is the Hairpin cotter which has a preformed shape and behaves like a locking. Cotter pins are typically used with slotted nuts to keep the nuts from being loosened. A cotter pin has a round head and ends that are bent after assembly to be locked in position. They are highly formable and don’t break easily. Cotter pins: Cotter pins are used to keep parts in position. These cotters have a short threaded section at the narrower end of the taper, which is used to hold the cotter in place with a washer and nut. Cotter pins are simply bent metal strips made from ductile metal, mainly mild steel. The angle of the wedge determines the position of the parts being held therefore, on a bicycle, the pedal arms will only be at 180 degrees to each other if the angle of the cotter pin's wedge is the same on both pins.įormerly, it was common to mount bicycle cranks using a cotter, although now usually a more easily maintained arrangement is used such as a square tapered or splined interface. Typical applications are in fixing a crank to its crankshaft, as in a bicycle, and a piston rod to a crosshead, as in a steam engine. In British usage cotter pin has the same meaning, but in the U.S. Pin or wedge passing through a hole to fix parts tightly together Cross-section of a connecting rod, showing strap (S), gib (G), and cotter pin (C) Another view, with scale, of bicycle crank cotterĪ cotter is a pin or wedge passing through a hole to fix parts tightly together.
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