Unlocking the Mysteries of Clevis Pins: the Invisible Heroes in Mechanical Connection

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INTRODUCTION:

In our daily life, few people pay attention to a small metal accessory – Clevis Pins. However, it is this seemingly inconspicuous part that plays an extremely important role in the mechanical world. This article will lead readers to have a deep understanding of the origin, application and irreplaceable role of clevis pins in mechanical systems.

Part 1: What Is A Clevis Pins?

A clevis pin is a reusable, cylindrical, non-threaded pin available in a variety of styles that secure components between the head and the end of the pin. They are ideal for quickly connecting or disconnecting equipment in temporary or permanent applications, especially those that do not require precise alignment.

Part 2: The Origin of Clevis Pins

Before the Industrial Revolution, mechanical equipment was usually connected using simple wooden or iron nails. However, this connection method has disadvantages such as easy loosening and easy wear. At the end of the 19th century, the birth of clevis pins completely changed the way of mechanical connection. First appearing in the railway industry, clevis pins have gradually been widely used in various fields due to its excellent performance.

Part 3: Application Fields of Clevis Pins

Clevis Pins have a wide range of applications, covering almost all mechanical equipment connections and fixations. From automobiles, airplanes to ships, engineering machinery, agriculture, construction and more, whether it is large-scale industrial equipment or daily household appliances, clevis pins play a key role. They are used to connect suspension systems, brake systems, joysticks, etc. to ensure the normal operation and safety of mechanical equipment.

Part 4: Design and Features of Clevis Pins

The design of Clevis Pin is relatively simple, consisting of a pin with two parallel fixing holes and a removable pin. This design enables the Clevis Pin to be easily disassembled and replaced. In addition, the titanium CLEVIS PIN also has the characteristics of high strength, wear resistance, and corrosion resistance, ensuring its reliability in various harsh environments.

Part 5: Clevis Pin Anatomy

In its most basic structure, a clevis pin consists of a head, shank, and shank end, with the most pertinent measurements being the diameter, shank length, effective length, and head diameter.

However, there are multiple styles of clevis pins with different heads and ends. These include heads that can be flat, radiused or chamfered, angled at 25°, grooved, or grooved and drilled, each well suited for a variety of applications. They are also available in a similar variety of end styles, with some styles including adjustable ends that feature multiple holes or quick-release pins with detent balls.

More often than not, these pins are used for three-part clevis fastening systems consisting of a clevis rod end or clevis hook, a clevis pin, and a bridge pin, e-clip, or similar fastener. The clevis pin is inserted through the holes of the clevis, and the attaching fastener will secure the clevis pin on one or both sides.

Part 6: Clevis Pins Types

6.1: Standard clevis pin
Standard clevis pin, commonly known as corn picker pins, flat head pins, or hitch pins, consists of a cylindrical body with a hole drilled through it and a head that is larger than the hole diameter. These pins have a basic flat head with no chamfers, featuring a single hole at one end.
To use a standard clevis pin, the pin is inserted through aligned holes in two objects that need to be connected. The head of the pin prevents it from sliding all the way through the holes, ensuring that the objects remain securely connected. The pin may also be secured in place by using a cotter pin or a split pin, which is inserted through the hole in the pin and bent to prevent the pin from sliding out.
They come in various sizes and diameters to accommodate different applications. The holes in the objects being connected must be sized to match the diameter of the pin.
Standard clevis pins are widely used in industries such as automotive, construction, agriculture, and machinery. They are used for connecting components, such as linkages, hinges, and joints, and are known for their simplicity, versatility and reliability.

6.2: SAE Clevis Pins
SAE clevis pins are commonly used in mechanical and automotive applications. The SAE(the Society of Automotive Engineers) standardizes the dimensions and specifications of these clevis pins to ensure compatibility and interchangeability.
SAE Clevis Pins typically have a head on one end and a hole on the other end, and feature chamfered ends. The head is usually circular or square in shape and provides a surface for applying force or attaching other components. The hole allows for the insertion of a cotter pin, bridge pins, safety pins or other securing device to prevent the pin from sliding out. These pins are made from various materials such as titanium, steel, stainless steel, or aluminum, depending on the application requirements. They come in different sizes and diameters to accommodate different loads and fit into corresponding clevises or brackets.
SAE Clevis Pins are used in a wide range of applications, including suspension systems, linkages, control arms, tow bars, and other mechanical connections. They offer a secure and reliable method for joining components while allowing for easy disassembly when needed and the chamfers make installation smoother.

6.3: Grooved Clevis Pins
Grooved clevis pins are a type of fastener that is commonly used in various applications, such as mechanical systems, automotive industry, and construction. These pins are specifically designed with a groove along the length of the pin, which allows them to be easily secured using a cotter pin or other types of retaining clips.
The grooved design of the clevis pin ensures a secure and reliable connection between different components. It prevents the pin from rotating or coming loose during operation, which is particularly important in high-stress or vibration-prone applications.
Grooved clevis pins are available in a variety of materials, including titanium, stainless steel, carbon steel, and alloy steel, to suit different environmental conditions and load requirements. They can also be found in various sizes and diameters to accommodate different applications.
In addition to their secure fastening capabilities, grooved clevis pins also offer ease of installation and removal. The grooves on the pin allow for quick and convenient attachment and detachment, which can be especially beneficial in situations where frequent disassembly is required. Overall, grooved clevis pins are an essential component in many industries, providing a reliable and efficient way to secure and connect different parts or components together.

6.4: Headless Clevis Pins: Drilled and Grooved
Headless clevis pins are a type of fastener used to secure two components together. They are called “headless” because they do not have a traditional head like a bolt or screw. Instead, they have a cylindrical body with a hole drilled through one end and a groove around the circumference of the other end.
The drilled end of the pin is used to insert a cotter pin or other similar fastener to lock the pin in place once it is installed. The groove on the other end provides a surface for the cotter pin to rest against, preventing it from sliding out of the hole.
The advantage of headless clevis pins is that they can be easily installed and removed without the need for any tools. They are commonly used in applications where frequent assembly and disassembly is required, such as in agricultural equipment, automotive applications, and industrial machinery.
Drilled and grooved headless clevis pins are typically made from titanium, steel or stainless steel for strength and durability. They are available in various sizes and lengths to accommodate different applications. When selecting a headless clevis pin, it is important to consider the load requirements, as well as the diameter and length needed for the specific application.
Overall, headless clevis pins are a versatile and convenient fastener option for securing components together in a wide range of industries. Their drilled and grooved design allows for easy installation and removal, making them a popular choice for many applications.

6.5: Adjustable (or Universal) Clevis Pins
Adjustable clevis pins, also known as universal clevis pins, are a type of fastener that can be adjusted to accommodate different lengths or sizes. They typically consist of a cylindrical pin with holes drilled along its length and a movable sleeve or collar that can be positioned to align with the desired hole.
To use an adjustable clevis pin, you would insert the pin through the aligned holes in the objects or components you are trying to connect. Then, you would slide the sleeve or collar along the pin until it is in the desired position. Once in place, you would secure the sleeve or collar with a locking mechanism, such as a set screw or a cotter pin, to prevent it from sliding or rotating.
Adjustable clevis pins are often used in applications where precise alignment or adjustment is necessary, such as in mechanical linkages, pivoting connections, or adjustable machinery. They offer flexibility and convenience by eliminating the need for different sizes of fixed-length pins.
When selecting an adjustable clevis pin, consider factors such as the load capacity, material, and diameter of the pin, as well as the range of adjustability required. It is important to choose a pin that can withstand the forces and conditions of your specific application to ensure safe and reliable operation.
Overall, adjustable clevis pins provide a versatile and efficient solution for connecting and adjusting components in various mechanical systems.

6.6: Cotterless Detent Clevis Pins
A cotterless detent clevis pin consists of a cylindrical body with a hole running through the center, and a spring-loaded ball bearing mechanism. The pin is inserted through aligned holes in the objects to be fastened, and the ball bearing mechanism engages with detent holes on the pin, preventing it from coming out unintentionally.
Unlike traditional cotter pins, which require a separate cotter pin to secure them in place, cotterless detent clevis pins have an integrated locking mechanism. This makes them easier to install and remove, as there is no need for additional tools or components.
Cotterless detent clevis pins are commonly used in mechanical and industrial applications where a secure and reliable fastening method is required. They are often used in machinery, equipment, and automotive applications, where frequent disassembly and reassembly is necessary.
Overall, the cotterless detent clevis pin offers a convenient and efficient solution for fastening objects together, providing a secure and reliable connection while allowing for easy installation and removal.

6.7: Bent Clevis Pins: Standard and Adjustable
Bent clevis pins are commonly used in various applications to secure two components together. They are designed with a bent shape, which allows for easy installation and removal without the need for tools.
Standard bent clevis pins have a fixed angle that is pre-determined during the manufacturing process. This means that they can only be used in specific applications where the angle of the bent pin matches the requirements.
On the other hand, adjustable bent clevis pins feature a design that allows for the angle to be adjusted to fit different applications. This flexibility makes them more versatile and suitable for a wider range of uses. Adjustable bent clevis pins typically have a lock mechanism that allows for easy adjustment and secure locking once the desired angle is achieved.
Both standard and adjustable bent clevis pins are available in various sizes, materials, and finishes to suit different requirements. They can be used in a wide range of industries, including automotive, construction, agriculture, and manufacturing.
In summary, bent clevis pins are a convenient and reliable way to secure components together. Standard bent clevis pins have a fixed angle, while adjustable bent clevis pins allow for flexibility and customization. Both types are widely used in different industries and are available in various sizes and materials.

Part 7: Mating Clips and Fasteners for Clevis Pins

Mating clips and fasteners for clevis pins are used to secure the pin in place and prevent it from coming loose or falling out. These clips and fasteners are typically made of metal and are designed to fit snugly around the pin, holding it securely in place.
If a clevis pin features a hole at its end type and/or head, you can use a wire form pin or clip to hold it in place. Compatible fasteners include:

  1. Cotter Pins: Cotter pins are straight pins with a bent end that is inserted through a hole in the pin. The bent end is then bent back over the pin to hold it in place.
  2. R-Clips: R-clips are shaped like the letter “R” and are commonly used to secure clevis pins. They are inserted through a hole in the pin and then the curved end of the clip is bent back over the pin to hold it in place.
  3. Safety Pins: Safety pins are similar to hairpin clips but have a coiled shape. They are inserted through a hole in the pin and then the coiled end of the pin is bent back over the pin to hold it in place.
  4. Lynch Pins: Lynch pins are similar to R-clips but have a ring attached to one end. They are inserted through a hole in the pin and then the ring is rotated to hold the pin in place.


If a clevis pin features a grooved head or end point, the accompanying fastener should clip around or wedge into the groove. Options include:

  1. Hairpin Clips: The open end of the hair pin slides onto the pin groove until the first loop clasps around the shaft.
  2. R-Clips: On a grooved head or end, the open end of the bridge pin slides onto the groove until the first loop clasps around the shaft.
  3. E-Clips: Insert the open end of the e-clip onto the grooved shaft and apply force until it clips into place.
  4. Poodle  Clips: Like an e-clip, a poodle clip features large “shoulders” or “ears” that offer extra retention surface against the retained part.


These mating clips and fasteners for clevis pins are essential for ensuring that the pin remains securely in place, especially in applications where the pin is subject to vibration or movement. They are commonly used in various industries, including automotive, construction, and agriculture.

Part 8: Future Development of Clevis Pins

With the advancement of science and technology and the improvement of industrial manufacturing technology, the design and materials of CLEVIS PIN are also constantly innovating. In the future, CLEVIS PIN is expected to be lighter, stronger, and may have more functions, such as intelligent sensing and automatic connection. This will further improve the efficiency and safety of mechanical equipment.

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