How to Cut Cast Iron Pipe

Get step-by-step instructions on how to cut cast iron pipe safely and efficiently with this guide from the experts.

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If you’re working on a plumbing project that requires cutting cast iron pipe, there are a few things you need to know. This type of pipe is tough and durable, but it can be challenging to cut through. With the right tools and techniques, however, it’s not impossible. Here’s a quick overview of how to cut cast iron pipe.

First, it’s important to choose the right saw for the job. A standard hand-held hacksaw will do the trick, but if you have access to a power saw, that will make the job much easier. A reciprocating saw or a circular saw with a metal-cutting blade will both work well.

Next, you need to mark the pipe where you want to make your cut. Use a pencil or a marker for this so you have a clear line to follow. Once the pipe is marked, set up your saw and start cutting If you’re using a hand-held hacksaw, it’s important to go slowly and apply gentle pressure. If you’re using a power saw, start with the blade on low speed and gradually increase the speed as needed.

As ’re cutting be sure to keep the blade perpendicular to the pipe. Otherwise, you risk damaging the blade or creating an uneven cut. Also, be sure to wear gloves and eye protection while you’re working. Cutting through metal can create sparks or debris that can be harmful if they come into contact with your skin or eyes.

Once you’ve made your cut, clean up any burrs or sharp edges with a file or sandpaper. Then, your cast iron pipe is ready for whatever project you have in mind!

What You’ll Need

-A power saw with a Metal Cutting blade
-A sharp chisel
-Measuring tape
-A level
-Eye and ear protection


1. Measure the length of pipe you need to remove and add 1 inch to allow for the end cap. Mark the cutting line with a pencil.

2. Set the power saw to make a plunge cut at the beginning of the marked line and cut through one side of the pipe.

3. Flip the pipe over and finish cutting through the other side of the pipe.

4. score around the circumference of the pipe with a sharp chisel, being careful not to damage the surrounding area.

5. Use a level to check that your score line is level all the way around before you begin cutting.

6. Cut through the scored line with your power saw, being sure to keep your cuts as straight as possible.

7. Remove any burrs or sharp edges from your cut pipe with a file or sandpaper before installing your new fittings.

Cutting the Pipe

Most people think that cutting cast iron pipe is a very difficult and complicated task, but it really isn’t. In fact, with the right tools and a little bit of know-how, cutting cast iron pipe can be a relatively simple and straightforward process. Here’s a step-by-step guide on how to do it:

1. Begin by marking the point where you want to make your cut. It’s important to be as accurate as possible here, so take your time and use a sharp marker or pencil to make a clear line.

2. Once you’ve marked the cutting line, use a tape measure to find the center point of the pipe. This will be where you start your cut.

3. Next, set up your cutting torch. If you don’t have a cutting torch, you can also use an oxyacetylene torch for this step. Make sure that the tip of the torch is at least 1/8 inch away from the surface of the pipe to avoid damaging it.

4. When your torch is ready, slowly start making your way around the circumference of the pipe. As you go, keep the flame about 1/8 inch away from the surface of the pipe. Remember to move slowly and evenly around the pipe to avoid creating any uneven edges.

5. Once you’ve made it all the way around the pipe, turn off your torch and let the pipe cool for a few minutes before handling it.

Finishing Up

Once you have cut through the cast iron pipe, you will need to remove the resulting debris from the area. This can be done by using a wire brush to remove any large pieces of pipe or by using a vacuum cleaner to remove smaller pieces. Once the area is clear, you can then use a sealant to repair any cracks or holes in the remaining cast iron pipe.