A clevis pin, also known as a hairpin cotter or split pin, is a simple yet indispensable device used in countless mechanical applications. It consists of a cylindrical head with a bifurcated tail that is bent into a U-shape. The pin is typically inserted through a hole in the clevis (a U-shaped yoke) and then secured with cotter keys or nuts.
Clevis pins come in various types, each suited for specific applications:
Choosing the appropriate clevis pin for your application is crucial for ensuring proper performance and safety. Consider the following factors:
Installation:
Removal:
Common clevis pin problems include:
Story 1: A farmer used an undersized clevis pin to secure the drawbar of his tractor. During operation, the pin failed, causing the tractor to detach from the implement it was pulling. Luckily, no one was injured, but the farmer learned the importance of using the correct clevis pin size.
Story 2: A construction worker used a clevis pin that was too short for the application. The pin did not extend far enough past the locking mechanism, allowing it to disengage under load. The resulting accident caused significant property damage.
Story 3: A mechanic used a steel clevis pin in a saltwater environment. Over time, the pin corroded and weakened, leading to its failure. The mechanic learned the lesson of using a corrosion-resistant material for marine applications.
Q: What is the difference between a clevis pin and a cotter pin?
A: Clevis pins are cylindrical pins with a bifurcated tail, while cotter pins are U-shaped wires used to secure clevis pins.
Q: How often should clevis pins be inspected?
A: Clevis pins should be inspected regularly for signs of wear, damage, or corrosion. The frequency of inspections depends on the application and environment.
Q: What is the proper way to remove a cotter pin?
A: Grasp the cotter pin with pliers and pull it out of the hole straight. Do not bend the cotter pin excessively.
Q: Can clevis pins be reused?
A: Yes, clevis pins can be reused if they are in good condition and have not been damaged.
Q: What is the recommended torque setting for clevis pin nuts?
A: The recommended torque setting for clevis pin nuts varies depending on the size and material of the pin and nut. Consult the manufacturer's specifications for specific torque values.
Q: How do I prevent clevis pins from corroding?
A: Use corrosion-resistant materials such as stainless steel or aluminum. Regularly clean and lubricate the pins to prevent rust and buildup.
Tables:
Clevis Pin Grade | Tensile Strength (psi) |
---|---|
2 | 55,000 |
4 | 63,000 |
6 | 72,000 |
8 | 85,000 |
Clevis Pin Diameter (inches) | Hole Diameter (inches) |
---|---|
1/4 | 13/64 |
5/16 | 17/64 |
3/8 | 19/64 |
1/2 | 25/64 |
Locking Mechanism | Advantages | Disadvantages |
---|---|---|
Cotter Pin | Low cost, easy to install and remove | Can be difficult to bend properly, can fall out if not secured correctly |
Bolt | Secure, can be tightened and loosened with tools | Requires additional hardware (nut), can be slow to install and remove |
Jaw | Permanent connection, very secure | Difficult to remove, can damage the clevis or pin if not aligned properly |
R-Clip | Quick and easy to install and remove, provides a secure connection | Can be difficult to remove if the clip is damaged or deformed |
Quick-Release | Fast and convenient to use, allows for easy removal of the pin | Can be more expensive than other locking mechanisms, may not be as secure as other options |
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