How to Cut Copper Pipe

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Look at the inside of your fresh cut. You’ll see a little jagged lip of copper, known as a burr. This is the metal equivalent of a hangnail—annoying and capable of ruining your whole day. If you ignore it, it can snag on fittings and cause leaks later.

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You need to deburr it. Most tubing cutters have a little fold-out triangular blade for this exact job. Just stick it inside the pipe and give it a few twists. It’s like using a tiny, one-armed corkscrew. If you don’t have that, a rough file or even a piece of sandpaper works fine.

Never skip this step. I once did, and my father-in-law, a retired plumber, just stared at the pipe for a full ten seconds. The silence was louder than any lecture. Remove the burr, save your dignity.

The Hacksaw Alternative (The Caveman Method)

If you’re a rebel and using a hacksaw, brace the pipe securely in a vise or clamp it to a workbench. Letting it roll around while you saw is like trying to slice a tomato on a trampoline—you will get hurt. Mark your cut line with a sharpie so you don’t saw blind.

Use a fresh blade with at least 24 teeth per inch. Start with slow, short strokes to create a starter groove. Then, go full speed with long, steady strokes. Remember to saw on the waste side of the mark, not the piece you’re keeping. Copper is soft, so a few dozen strokes and you’re through.

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After the hacksaw, you’ll have a burr the size of a small mountain. You’ll need a serious file to knock that down. Honestly, go buy the tubing cutter. Your future self will thank you.