Clevis pins, often referred to as "cotter pins" or "split pins," are indispensable fasteners commonly used in various industrial, automotive, and construction applications. Their unique design and versatility make them an essential component for securing joints, connecting components, and preventing accidental disassembly.
Clevis pins typically consist of a cylindrical body with a slotted head on one end and a cross-hole on the other. The slotted head allows for easy insertion and removal using a screwdriver or pliers, while the cross-hole accommodates a cotter pin or other locking mechanism to secure the clevis pin in place.
The slotted head of the clevis pin is designed to accommodate a cotter pin, which is a separate, bent wire that passes through the cross-hole and locks the clevis pin in position. The cotter pin's bent ends spread apart and impede the clevis pin from sliding out, creating a secure and reliable connection.
Clevis pins find applications in a wide range of industries, including:
Clevis pins are available in various types and materials to suit specific application requirements. Some common types include:
Clevis pins are typically made of steel, stainless steel, or aluminum, depending on the required strength, corrosion resistance, and weight properties.
The use of clevis pins offers several benefits and advantages:
While clevis pins are versatile and reliable fasteners, there are a few common mistakes to avoid when using them:
To ensure proper installation and optimal performance, follow these steps:
Clevis pins are manufactured and used in accordance with several industry standards and regulations, including:
Case Study 1: Replacing Clevis Pins in Conveyor System
A manufacturing plant experienced frequent breakdowns in its conveyor system due to worn-out clevis pins. Replacing the clevis pins with new ones made of hardened steel significantly reduced breakdowns and improved overall system reliability.
Case Study 2: Securing Temporary Structures
In the aftermath of a hurricane, construction crews used clevis pins to quickly and securely assemble temporary structures for housing and emergency response services. The clevis pins provided a strong and reliable connection, enabling the structures to withstand high winds and heavy rains.
Case Study 3: Locking Gear Pin
A mining operation needed to secure a gear pin that was frequently coming loose due to vibration and heavy loads. By replacing the original bolt with a clevis pin and adding a cotter pin, the gear pin was locked in place securely, reducing downtime and improving safety.
Conclusion
Clevis pins are versatile and reliable fasteners that play a critical role in securing joints, connecting components, and preventing accidental disassembly. They offer strength, durability, easy installation, and low cost, making them a valuable asset in various industries. By understanding the types, materials, applications, and best practices associated with clevis pins, you can ensure optimal performance and safety in your projects.
Table 1: Clevis Pin Dimensions According to ASTM F416
Diameter (d) | Length (L) |
---|---|
0.125 | 0.75-2.0 |
0.188 | 1.0-3.0 |
0.250 | 1.5-4.0 |
0.313 | 2.0-5.0 |
0.375 | 2.5-6.0 |
Table 2: Clevis Pin Shear and Tensile Strengths
Material | Shear Strength (psi) | Tensile Strength (psi) |
---|---|---|
Steel (medium carbon) | 58,000-78,000 | 90,000-115,000 |
Stainless steel (304) | 40,000-60,000 | 75,000-105,000 |
Aluminum (6061-T6) | 25,000-40,000 | 40,000-60,000 |
Table 3: Clevis Pin Standards and Regulations
Standard | Organization | Purpose |
---|---|---|
ASTM F416 | ASTM International | Specification for steel clevis pins with square head |
DIN 1481 | German Institute for Standardization | Specification for clevis pins with cotter pin hole |
ISO 8734 | International Organization for Standardization | Specification for cotter pins |
SAE J429 | Society of Automotive Engineers | Specification for cotter pins |
AN MS24692 | Aerospace Standard | Specification for clevis pins with cotter pin hole |
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