| Split Pins & Clevis Pins Clevis pins, bolts and rods are all fastening devices which are typically secured with cotter pins. Cotter pins (Split Pins) are fasteners that are inserted through a small hole in the clevis pins after insertion, the tines or arms are spread in such a manner that the cotter pin cannot be retracted through it's installation hole, thus securing the fastening device in place. There are four types of cotter pins; split pins, hair pins, bow tie pins and circle pins. Depending on the specific application, one or more types of cotter pin may be best suited. Installation is easy regardless of the type pin being used. Measure the clevis, rod bolt or other fastener that is to be secured with a cotter pin. Take note of the length and width of the area where the pin will be inserted. Record the measurements as well as the quantity needed so that you can purchase the correct size pins for the job. Pins should fit snugly in their installation hole, yet still be capable of rotating freely. Their length shall only be as long as required to "grip" the fastening device. Insert a split pin type cotter pin into the hole on the end of the fastening device. The pin should slide freely into the hole, but the head of the pin should prevent it from traveling all the way through. The body of the pin should remain perpendicular to the shaft of the bolt or rod it is securing. Bend the two tines (prongs) around the shank of the rod or bolt, so that the tines enclose the device snugly. Insert a hair pin (R-pin) type cotter pin into the hole on the end of the fastening device by sliding the main leg (the tine that has no bends) of the pin into the hole. The head of the pin will prevent it from travelling all the way through. The curved body of the pin should firmly grasp the side of the bolt or rod it is securing. The tension of the pin will hold it in place, no bending is required. When inserting a split pin into a fastener that incorporates a castellated nut (a nut with indentations on one end) always wrap both tines of the pin securely around castellated portions of the nut. This will make partial movement of the nut in any direction impossible |
