Weldolets vs. Sockolets: The Main Differences

The main difference between a weldolet and a sockolet is how they connect to the main pipe.

A weldolet uses a butt-weld connection, joining directly to the main pipe.

A sockolet uses a socket-weld, where the branch pipe fits into a socket and is welded around the top.

So which one is the better fit for your needs? Let’s take a closer look at each component to help you decide. 

What Is a Weldolet?

A weldolet is a butt-weld pipe fitting with a beveled end. It connects directly to the main pipe using a full-penetration weld.

This fitting is often used for 90° branch connections and is known for reducing stress at the joint.

You’ll find weldolet pipe fittings in high-pressure and high-temperature systems, such as oil and gas pipelines.

What Is a Sockolet?

A sockolet is a socket-weld pipe fitting. It has a socket where the branch pipe inserts, followed by a weld around the outside.

This fitting is best for smaller pipe sizes and moderate-pressure systems.

You’ll often see sockolet pipe fittings in instrumentation lines, water systems, and smaller branch connections.

What Is a Threadolet?

A threadolet is similar to a weldolet but connects using threads instead of a weld. The branch pipe screws into the fitting, making installation simpler.

Threadolets are commonly used for low-pressure systems and smaller pipe diameters, such as instrumentation lines.

They use NPT (National Pipe Thread) standards for threading.

Differences Between Weldolet, Sockolet, and Threadolet

1. Installation

If you’re welding straight to the pipe, a weldolet is the way to go. It requires a butt-weld, meaning the branch pipe connects directly to the main pipe with a full-penetration weld.

Meanwhile, a sockolet is easier to install. You slide the branch pipe into a socket and then weld around the outside. It’s quicker but only suitable for smaller lines.

2. Pipe Size

Weldolets are your go-to for large pipes. They handle wide diameters and are common in industrial pipelines.

Sockolets work best for small to medium pipes, like those in utility lines or instrumentation setups.

3. Pressure Handling

If you’re working with high-pressure systems, choose a weldolet. Its butt-welded joint is strong and built to handle heavy loads and stress.

A sockolet is fine for moderate pressure systems. It’s reliable but not built for extreme conditions.

4. Strength and Durability

A weldolet creates a stronger joint because it’s fully welded to the pipe. It distributes stress more evenly, making it suitable for high-stress areas.

A sockolet is still sturdy but depends on the weld around its socket. It’s strong enough for most standard operations but not for heavy-duty work.

5. Cost and Maintenance

If you’re thinking about cost, sockolets are cheaper upfront. They’re quicker to install, which saves on labor.

But if you want durability, weldolets can save you money in the long run because they last longer under heavy use and require less maintenance.

6. Common Applications

You’ll see weldolets in pipelines, oil and gas systems, and anywhere that demands strength.

Sockolets are more common in instrumentation lines, water lines, and places where the pipe size is small and the pressure is moderate.

Choosing the Right Fitting

Now that you know the differences, you’re probably wondering: Which one should I choose for my project?

Choose a weldolet when:

• You want a strong, permanent connection for high-pressure systems.
• Your pipes are large-diameter or in industrial settings.
• You need a fitting that can handle heavy loads and stress.

Choose a sockolet when:

• You’re working with small to medium pipe sizes.
• You need a quicker, easier installation.
• Your system operates at moderate pressure.

Choose a threadolet when:

• You want a simple, threaded connection without welding.
• Your line is low-pressure, such as instrumentation lines.
• You need something easy to remove or replace later.

Still Unsure? Let’s Help You Decide

Every project is different. If you’re unsure which fitting is best for your job, contact us today. We’ll help you choose the right option based on your pipe size, pressure needs, and budget.Ready to get started? Reach out now for expert advice and a quote.

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Easy Peasy: The differences between weldolet, sockolet, and threadolet