![]() They are also used to secure ceiling fans to prevent falling if the mounting nut loosens. The pins are ideal for the unforgiving environment both above and below. 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. Precision engineered split pins, cotter pins, and clevis pins to the marine industry. 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. Commonly used within machine and automotive. In British usage cotter pin has the same meaning, but in the U.S. Cotter Split Pins have two prongs which separate during installation to keep castle nuts and washers in place. The cotter pin secures the bolt in place so that it’s less likely to loosen and come out.Another view, with scale, of bicycle crank cotterĪ cotter is a pin or wedge passing through a hole to fix parts tightly together. Consisting of a U-shaped piece of metal, it’s inserted through the hole of a bolt, after which the ends are twisted together. In ConclusionĪ cotter pin is a simple fastener that’s used to secure a bolt in place. Using this technique, the cotter pin is less likely to wiggle its way out of the bolt - something that could otherwise cause the bolt to come out as well. ![]() Some people assume that it’s best to twist the ends of cotter pins together, but this simple fastener offers the greatest protection against loosening when the ends are twisted away from each other. Next, you’ll need to twist the two prong-like ends of the cotter pin outwards and away from each other. Split pins American inch sizes American standard cotter pin sizes are in nominal fractional inches, starting at 1/32. ![]() To use a cotter pin, simply place it through the bolt’s hole. They already have a pre-drilled hole, allowing for faster and easier installation of a cotter pin. You can always try to drill a new hole into an existing bolt, but there are bolts available that are designed specifically for use with a cotter pin. To use, place the cotter pin in the pre-drilled and the bulbous head will stop the pin from moving all the way through. Therefore, you’ll need to choose a bolt with a pre-drilled hole if you’re planning to secure it using a cotter pin. This cotter pin secures two items in place with the use of a common. Without a hole, there’s nowhere to insert a cotter pin. It is available in stainless steel, carbon steel, and alloy steel to bear more wear and tear while also making it more corrosion resistant. The pins are designed using cold heading quality wire. ![]() Rather, you can only insert a cotter pin into a bolt if the bolt has a hole in it. Description: Clevis fasteners from ITA Fasteners are high precision fasteners which are used when a design needs a superior finish. Of course, not all bolts support the use of a cotter pin. How Cotter Pins WorkĬotter pins work by preventing the bolt in which they are inserted from coming out. Cotter pins are inserted into a bolt to prevent the bolt from loosening. Hairpin clips, also known as R-clips, slip on with no bending. A split pin has two long prongs that are bent to hold it in place. Cotter pins, or split pins, are bent to insert into the holes of clevis pins and other fasteners to secure the fastener system. They are common in securing wheels and machine components on an axle or shaft. As shown in the adjacent image, cotter pins consist of a narrow U-shaped piece of metal with a flared and circular top. Cotter pins secure other fasteners such as clevis pins or castle nuts. But what exactly is a cotter pin? The Basics of Cotter PinsĪlso known as a split pin, a cotter pin is a simple fastener that’s used to secure a bolt - or any other rod-shaped fastener - in place. There are ways to secure bolts in place, however, including the use of a clutter pin. If a bolt is attached to a machine, for instance, the vibrations produced by the machine may cause it to come out. Metric Cotter Pin Type Hairpin Retaining Cotter Pin Style Extended Prong Hammerlock Basic Material Brass Carbon Steel Low Carbon Steel Spring Wire Stainless Steel Steel Material Grade 1008 18-8 302 and 304 316 A2 A4 Spring Steel Fastener Finish Plain Zinc Plated Pin Dia. MSC Industrial supply is here to support all your metalworking and maintenance repair. It’s not uncommon for bolts to loosen over time. Shop a large range of 5 inch cotter pins at MSC Industrial Supply.
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