A clevis pin is a kind of fastener that allows connected parts to be swiveled around the linkage of the pin. It forms part of a clevis fastener system that also consists of a clevis and tang. The clevis itself is shaped like a “U” with holes at the prong ends for the pin, which bear resemblance to a bolt. The unthreaded or partially threaded clevis pin has a cross hole to accept a cotter pin. The tang is the component that goes between the clevis, and held in position by the clevis pin. A combined pin and clevis is referred to as a shackle, although it is only one of the many forms of the shackle. Clevises are utilized in a wide range of fasteners that are common in sailboat riggings, farming equipment, aircraft and automobiles. With a clevis, some axes are allowed full rotation while others can be restricted.
The clevis pin is sometimes called hinged pin or link pin and it is composed of a hole, shank and head. When using it, the hole that is found at the opposite side of the head is inserted through the parts that will be linked. An “R” clip, cotter pin or other similar fasteners is then placed into the hole to keep the pin in position.
There are various clevis pin sizes but all are used to prevent a couple of other parts from moving relatively to each other. The clevis pin has less variability since it could hold two components in one exact relative position, the reason of which holes should be drilled first in both parts. However, clevis pins are more secure since they are less likely to turn loose from vibration.
Types of Clevis Pin
There are a couple main kinds of clevis pins and these are the threaded clevis pin and the unthreaded clevis pin.
- Threaded Clevis Pins
The threaded clevis pin has a shank that is only threaded partially on one end while a formed head is on the other end. The head is incorporated with:
- Lip – performs as a stop when the pin is threaded into a shackle
- Flattened Tab – allows easy pin installation
- Cross Hole – allows mousing of the pin
- Unthreaded Clevis Pins
The unthreaded type of clevis pin on the other hand has a cross hole on one end and a domed head on the other. It is kept in position with a split pin or a cotter pin.
The bolt can perform like clevis but it is not designed to handle the lateral stress that clevis pins have to take. Conventional bolts can handle tension loads while clevis pins are made to take shearing forces. To reduce wear and failure rate of the pin and the clevis, the clevis pin must be fitted closely to the holes. The material used for clevis pins depend on the intended purpose. Mild steel clevis pin is used in chandlery while stainless steel clevis pin is used in marine applications and car braking systems.
As you can see, clevis pins actually have numerous applications today. With its huge importance comes a massive selection of these pins. Just make sure you get the right clevis pin for you device to ensure tight fit and proper function.