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How to Connect Galvanized Pipe Without Threads [Explained]

Galvanized pipes are well known for their durability and connecting them isn’t too difficult. But connecting galvanized pipes without threads is quite a hassle. Relax, if you know the right way to do it then it can be done in minutes.

How to connect galvanized pipe without threads?

Use a coupling to connect a non-threaded galvanized pipe. Measure the pipe and check the coating to determine the coupling. Ensure a square cut in both ends of the pipe to have a leak-free connection. Then clean the pipe to have a firm joint using a coupling. Tighten the bolts and you are done.

Still confused? Don’t worry! We have a whole guide waiting for you explaining each step. Read along!

How to Connect a Galvanized Pipe Without Threads

In most cases, a galvanized pipe will have threading on each end. But how do you connect one without threads?

To join two galvanized pipes without threads, a coupling is required. It’s quite similar to connecting PVC pipes but just using a coupling. However, there are certain important aspects to consider while doing so. Let’s first learn about them.

Things to Consider

Before you begin, there are a few elements you should be aware of. It’s critical to use the correct pipe, with the correct diameter and length. If the pipes don’t match then there will be leakage. This can cause a variety of problems with your walls, floors, and ceilings.

It’s also crucial to understand the type of pipe you’re installing. Galvanized pipes have both rough and smooth coating. So that also plays a part in connecting your pipe. Keep all of these factors in mind to have a leak-free connection. The method is simple as connecting sharkbite galvanized to PEX.

Now let’s go through the steps one by one to connect galvanized pipe without threads.

Step 1: Measuring the Pipes

Measure the outer diameter of each pipe that will be required in your installation as the first stage. You may measure the pipe with any kind of measuring tape.

Different types of coupling can be used according to your need. But when the diameters are the same, a typical coupling is ideal.

But if you are using pipes with different diameters then you must use a stepped coupler. You’ll need to double-check that the coupling’s dimensions match the dimensions of your two pipes.

Because, if the dimensions don’t match then it will cause water leakage.

Step 2: Checking The Coating of The Pipe

Check if the galvanized surface of the pipes is rough or smooth by looking at the coating. If the galvanized coating appears and feels textured, choose a coupler designed for rough surface pipes.

Use a rough surface coupling if the coating is rough. This will offer more tolerance to your coupler that is also good against concrete and iron.

You can use a normal couple if the coating is smooth.

Step 3: Square Cutting Your Pipe

It’s very necessary for your pipes to be square cut if you wanna avoid leakage. If your pipe ends are not square there will be leakage.

You need to check the pipes end with a carpenter’s level. Align the carpenters level against the pipe to check if the ends are square. If they are, then there’s no need to be concerned and you may proceed.

But if the ends are not square then you need to cut them square. Use a hacksaw or power saw and cut the pipe square with the help of the carpenter’s level tool. Ensure that the pipes can be flushed against the coupling’s inner walls.

If it can’t be flushed then the end is uneven and you need to cut it again. Cut the pipes as near to the end of the pipe as possible. This will create less wastage and also reduce the risk of cutting the pipe too short.

Smooth out the edges with a sander afterward after cutting the pipe.

Step 4: Cleaning The Pipes

Dirt, grease, oil, dust can be very problematic in connecting the pipes. So make sure to clean the pipes to have a leak-free connection.

WIpe the pipes with a cloth to remove dirt and dust. Use a water-based degreaser if there’s greasy dirt. Clean the coupling area thoroughly and place the ends of the pipes together.

You can also use some abrasive cleaner to clean heavy dirt.

In case you are looking for some recommendations, here are some:

Product 1
Product 2

Now let’s move on to the next step!

Step 5: Inserting The Pipes

One end of the pipe should be inserted into the coupler. Align the pipe inside the coupling according to the pencil mark on the pipe.

Insert the second pipe and do the same. Make sure to center the coupling between two drawn lines.

The connection should be centered between the two pipe joints. Then, at both ends of the coupler, mark the pipes.

Step 6: Tighten The Bolts

Tighten the bolts using the proper tool. Keep tightening it until the pipes are fixed in place or the coupling is fixed on the pipe.

To consistently tighten the bolts, use a torque wrench. While tightening, notice whether it gets adjusted to the coupling’s indicated torque or not.

Be careful not to over-tighten the bolts. Overtightening bolts can cut the threads and make them useless. Also, since they are not immune to rust. So, cap the galvanized pipe when you need it in order to avoid rusting.

Here you have it. You have successfully connected unthreaded galvanized pipes together.


Question: How often do I need to change my galvanized pipe?

Answer: Not very often. The typical lifespan of a galvanized pipe is around 50 years. But it can vary upon different aspects like usage, frequency, water, etc.

Question: Can galvanized pipes be harmful?

Answer: The zinc plating on galvanized pipes depreciates with time, causing the pipes to deteriorate. When pipes degrade, mercury can build up. This can be deadly and cause several health issues if not addressed in time.

Question: Is it possible to thread a non-threaded galvanized pipe?

Answer: Yes, you can thread a non-threaded galvanized pipe but it is not ideal. You need to buy extra threads with the help of specialized tools. So this is not recommended.


Got your answer on how to connect galvanized pipe without threads. Hopefully, this step-by-step guide was able to address all your queries.

But do remember to prioritize your safety first. Don’t try to do anything if you are not confident enough to do it. Contact a professional instead. 

Good luck improving your home. Till next time, bye!