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6 Types of Tube Fittings and Their Uses

Tube Fittings

Tube fittings are essential in connecting pipe and tube lines. They aid in properly functioning industrial fluid systems, providing a leak-proof and secure way to transfer liquids and gases. However, choosing the wrong type of fitting can lead to a connection failure, leaks, or even accidents. This is why we’ll discuss different types of tube fittings and their applications to help you pick the best option for your needs.

Types of Tube Fittings

Compression Fittings

A compression fitting utilizes a nut and ferrule system to secure a tube or pipe into a fitting. These fittings maintain a strong seal in high-vibration systems that require a leak-proof connection. They are also easy to install and don’t require any welding or adhesives. Compression fittings are commonly used in refrigeration systems, water filters, and natural gas lines.

Double Ferrule Fittings

Similar to the compression fitting, double ferrule fittings utilize two ferrules to grip the outer diameter of a tube. However, the ferrules are manufactured to be at right angles to each other to hold the line in place better. These fittings are ideal for high-pressure and extreme-temperature systems. Double ferrule fittings are commonly used in chemical, petrochemical, and oil and gas industries.

Single Ferrule Fittings

A single ferrule or bite-type fitting utilizes only one to secure the tube onto the fitting body. These fittings provide a firm and secure grip and work best with softer tubing materials like nylon or polyethene. Single-ferrule fittings are commonly used in air conditioning and fuel lines.

Push to Connect Fittings

Push-to-connect fittings provide a simple but reliable connection option. They require no threading, soldering, or clamping, making them easy to install and ideal for high-volume applications. They have become increasingly popular in recent years, mainly in the pneumatics industry but are also used in fluid systems.

Flared Fittings

Using a flared nut, a flared fitting compresses a tube’s end onto the appropriate body. The flaring process increases the tube’s surface area, ensuring a tight and secure connection. These fittings are best used in high-pressure cryogenic or high-temperature heating systems, such as air conditioning or gas lines.

Threaded Fittings

Threaded fittings are an essential component in most industrial and residential applications. These fittings provide a simple and secure way to combine pipes and other hardware using male and female threads. They come in various sizes, materials, and configurations to meet different requirements and can be easily installed and maintained with the right tools and techniques. Whether you’re working on a new construction project or repairing an existing system, knowing how to select and use the right threaded fittings can make all the difference in the quality, safety, and performance of your plumbing work.


Many different tube fittings are available today, each with unique applications. The correct type of proper selection generally depends on the system’s requirements and the tubing’s material. Choosing the right fitting for the job is essential to avoid issues compromising the entire system. Always remember that investing in quality tube fittings will lead to a better-performing system in the long run.

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