When you think of fasteners, you’ll probably envision traditional types like screws and bolts. For centuries, screws and bolts have been used to join objects and surfaces. There are other types of fasteners available, however, one of which is the clevis fastener.
The Clevis Fastener Explained
As shown in the photo here, the clevis fastener — also known as simply as a “clevis” — features a unique hooked shape resembling that of the letter U. The open section contains two holes, one on each prong, that supports the use of a pin. Once the clevis position is positioned properly, a pin is inserted through these holes. A split pin may then be inserted into the pin itself to secure it in place. Clevis fasteners are often used in automobiles, aircraft, boats and construction equipment for the purpose of connecting control components.
The Parts of a Clevis Fastener
While there are different types of clevis fasteners (see below), the most common type consists of three parts:
- Clevis: The main U-shaped part of the clevis fastener is known as the clevis.
- Tang: Essentially a pin, the tang rests between the prongs of the clevis. the tang can be inserted or removed.
- Clevis Pin: The clevis pin is used to hold the tang in the place, securing it to the clevis.
Threaded vs Unthreaded Clevis Pins
Clevis pins can be either threaded or unthreaded. Threaded pins are characterized by partial threading at the head, whereas unthreaded pins have a rounded head. Threaded pins generally offer a higher level of stability and security than their unthreaded counterparts because they can be screwed, at least partially, into the the clevis.
The Different Types of Clevis Fasteners
The most common type of clevis fastener is the shackle. It features the same design as mentioned above, consisting of a clevis, tang and clevis pin.
Another type of clevis fastener is a the bracket. Bracket clevis fasteners feature a rectangular-shaped hook with holes for other fasteners, such as screws or bolts.
There are also clevis hangers that contain not one but two clevises. With a clevis hanger, there’s a traditional U-shaped shackle clevis as well as a V-shaped clevis that are connected together using a clevis pin or some other fastener.
Finally, clevis rod ends feature a U-shaped design with a hole around the base. They are usually machine-formed and contain a threaded hole to achieve a higher level of stability and security.