5 Easy Steps on How to Cut PEX Piping

PEX piping cutter being used
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When it comes to plumbing, PEX (cross-linked polyethylene) has become increasingly popular due to its flexibility, durability, and ease of installation. However, cutting PEX can be a bit tricky if you don’t have the right tools or techniques. In this comprehensive guide, we will explore the best way to cut PEX pipes, ensuring clean and precise cuts that will result in a secure and leak-free plumbing system.

The choice of cutting tool depends on the size and type of PEX pipe you are working with. For smaller PEX pipes (up to 1 inch in diameter), a sharp utility knife or a dedicated PEX cutter is recommended. These tools provide a clean and precise cut with minimal effort. For larger PEX pipes (over 1 inch in diameter), a hacksaw or a power shear may be more suitable. It is important to use a sharp blade or saw to avoid jagged or uneven cuts that can weaken the pipe and lead to leaks.

Before making the cut, it is essential to ensure that the PEX pipe is free of any debris or kinks. If necessary, use a pipe cleaner or a brush to remove any dirt or obstructions. Mark the location of the cut with a pencil or a marker to guide your tool. When cutting, apply steady and even pressure to the tool to create a clean and perpendicular cut. Avoid using excessive force as this can crush or damage the pipe. Once the cut is complete, use a deburring tool or a sharp knife to remove any burrs or sharp edges from the cut end to prevent leaks and ensure a smooth flow of water.

Tools for the Job

PEX Cutters

Manual PEX Cutters

Manual PEX cutters are the most common and affordable option for cutting PEX tubing. They feature a pair of spring-loaded blades that snap closed when the handles are squeezed.

These cutters are small and easy to use, making them ideal for small projects or tight spaces. However, they require a bit of force to use, which can be tiring for larger projects or repetitive cutting.

When choosing a manual PEX cutter, it is important to select one that is made from high-quality materials and has a sharp blade. A dull blade will not cut through PEX tubing cleanly and can lead to leaks.

Ratchet PEX Cutters

Ratchet PEX cutters are a more expensive option than manual cutters, but they offer a number of advantages. They are easier to use, require less force, and provide a cleaner cut.

Ratchet cutters work by using a ratcheting mechanism to gradually close the blades. This allows you to apply less force and get a more precise cut.

Ratchet PEX cutters are also ideal for cutting larger diameter PEX tubing.

Electric PEX Cutters

Electric PEX cutters are the most expensive option, but they offer the fastest and most convenient way to cut PEX tubing.

These cutters use a rotating blade to cut through the tubing. They are very easy to use and can cut through PEX tubing quickly and cleanly.

Electric PEX cutters are ideal for large projects or repetitive cutting.

Type	Pros	Cons
Manual PEX Cutters	Affordable, small, easy to use	Requires force, can be tiring
Ratchet PEX Cutters	Easier to use, less force, cleaner cut	More expensive
Electric PEX Cutters	Fastest, most convenient	Most expensive

Straight Cuts

To make a straight cut in PEX tubing, you will need a sharp knife or a pair of scissors. If you are using a knife, hold the tubing taut with one hand and score it lightly with the knife. Then, use a sawing motion to cut through the tubing. If you are using scissors, simply snip the tubing at the desired location.

When making a straight cut in PEX tubing, it is important to use a sharp blade. A dull blade will deform the tubing and make it more difficult to create a clean cut. It is also important to support the tubing while you are cutting it. This will help to prevent the tubing from buckling or kinking.

Using a PEX Cutter

The best way to make a straight cut in PEX tubing is to use a PEX cutter. A PEX cutter is a specialized tool that is designed to cut PEX tubing cleanly and easily. PEX cutters have a sharp blade that is mounted on a rotating head. The rotating head allows you to make cuts at any angle.

To use a PEX cutter, simply hold the tubing taut with one hand and position the cutter at the desired location. Then, squeeze the handles of the cutter to rotate the blade and cut through the tubing. PEX cutters are very easy to use and produce clean, precise cuts.

Advantages of using a PEX cutter	Disadvantages of using a PEX cutter
Makes clean, precise cuts	Can be expensive
Easy to use	Requires some practice to use correctly
Cuts at any angle	Not as versatile as other cutting tools

Cutting Around Obstacles

When you encounter an obstacle while cutting PEX, such as a joist or pipe, you’ll need to make a slight adjustment to your cutting technique. Here’s how to do it:

Score the PEX

Use a utility knife or sharp scissors to score the PEX around the obstacle, being careful not to cut all the way through. This will help to weaken the material and make it easier to cut.

Cut the PEX

Now, use your tubing cutter to cut the PEX at the score line. Be sure to apply firm, even pressure as you cut. If you’re using a manual tubing cutter, you may need to make multiple passes to completely cut through the PEX.

Deburr the PEX

Once the PEX is cut, use a deburring tool to remove any sharp edges or burrs from the cut end. This will help to prevent the PEX from leaking. There are several types of deburring tools available, so choose one that is appropriate for the size of PEX you’re using.

Table: Types of Deburring Tools

Tool Type	Description
Handheld Deburring Tool	A small, handheld tool with a blade that is inserted into the end of the PEX and rotated to remove burrs.
Deburring Pliers	A pair of pliers with a built-in deburring blade that is used to squeeze the end of the PEX and remove burrs.
Electric Deburring Tool	A power tool that uses a rotating blade to remove burrs from the end of the PEX.

Leaking Pipes

Leaking pipes are a common issue in homes and businesses. If you have a leaking pipe, it is important to fix it as soon as possible to prevent further damage. There are a few different ways to cut PEX pipe, but the best way to do it depends on the situation.

Using a PEX Pipe Cutter

The best way to cut PEX pipe is to use a PEX pipe cutter. These cutters are designed specifically for cutting PEX pipe and they make a clean, even cut. To use a PEX pipe cutter, simply insert the pipe into the cutter and rotate the cutter around the pipe until it cuts through.

Using a Hacksaw

If you do not have a PEX pipe cutter, you can also use a hacksaw to cut PEX pipe. However, it is important to use a fine-toothed hacksaw blade to avoid tearing or fraying the pipe. To use a hacksaw, simply clamp the pipe in a vise and saw through the pipe using a gentle, sawing motion.

Using a Utility Knife

In a pinch, you can also use a utility knife to cut PEX pipe. However, this is not the best method because it can be difficult to get a clean, even cut. To use a utility knife, simply score the pipe around its circumference and then bend the pipe back and forth until it breaks.

No matter which method you use to cut PEX pipe, it is important to make sure that the cut is clean and even. This will help to ensure that the pipe does not leak and that the connection is secure.

Method	Pros	Cons
PEX pipe cutter	Clean, even cut	Requires a specialized tool
Hacksaw	Can be used with a variety of blades	Can tear or fray the pipe if not used properly
Utility knife	Convenient	Difficult to get a clean, even cut

Safety First

As with any tool, safety should be your top priority when cutting PEX. Follow these precautions to avoid injury:

1. Wear Protective Eyewear

Tiny plastic fragments can fly into your eyes while cutting PEX. Safety glasses or goggles will keep your eyes safe.

2. Use a Sharp Cutter

A dull cutter will make it difficult to cut cleanly, increasing the risk of a slip. Sharpen or replace your cutter regularly.

3. Cut in a Well-Ventilated Area

Cutting PEX releases plastic fumes that can cause irritation. Always cut in a well-ventilated area or use a dust mask.

4. Secure the Pipe

Hold the PEX firmly in place before cutting. Use a clamp or vise to prevent it from moving and slipping.

How to Cut PEX

1. Measure and Mark the Cut Line

Measure the desired length of PEX and mark it with a pen or marker.

2. Position the Cutter

Place the cutter’s blade perpendicular to the mark on the PEX. The cutting edge should be against the pipe.

3. Squeeze and Rotate

Squeeze the cutter’s handles together while rotating it around the PEX. Apply even pressure to make a clean cut.

4. Remove the Cut Section

After completing the cut, remove the cutter and dispose of the cut section of PEX.

5. Deburr the Edges

Tool	Notes
Pipe Reamer	Chamfer the edges of the PEX to prevent snagging
Utility Knife	Carefully scrape away any burrs with the blade
Sandpaper	Smooth the edges by hand sanding

Deburring removes sharp edges that could weaken the PEX and cause leaks.

Hot vs. Cold Cutting

Hot Cutting

Hot cutting PEX involves using a heat source, such as a heat gun or a blowtorch, to melt the pipe and create a clean, smooth cut. This method is ideal for thicker PEX pipes, as it provides more control and precision than cold cutting. However, hot cutting requires special equipment and safety precautions, as the heat can pose fire hazards and produce toxic fumes.

Cold Cutting

Cold cutting PEX entails using a sharp tool, such as a PEX cutter, hacksaw, or utility knife, to sever the pipe without heat. This method is suitable for most PEX pipes, especially those of smaller diameters. It is relatively easy to perform and does not require specialized equipment, making it a popular choice for DIYers.

Choosing the Best Method

The most suitable cutting method depends on the pipe’s diameter, wall thickness, and the desired results. Here’s a table summarizing the key aspects:

Method	Best for	Pros	Cons
Hot Cutting	Thick pipes	Precision, clean cuts	Fire hazard, toxic fumes
Cold Cutting	Smaller pipes	Ease of use, no special equipment	Burrs, less precision

Safety Considerations

Regardless of the cutting method used, it is crucial to follow safety precautions. Wear protective gear, including safety glasses and gloves, and ensure adequate ventilation to prevent fumes from inhalation. If using a heat source, keep the work area clear of flammable materials and have a fire extinguisher nearby.

Using Specialized Tools

Pipe Cutters

Pipe cutters are designed specifically for cutting PEX tubing. They feature sharp blades that make clean, precise cuts without crushing or flattening the pipe. Pipe cutters come in various types, including manual, ratcheting, and hydraulic.

Shears

Handheld shears can also be used to cut PEX tubing. However, they are not as precise as pipe cutters and may require more effort to make a clean cut. It is important to use sharp shears that are specifically designed for cutting plastic pipe.

Utility Knives

Utility knives can be used to make small cuts in PEX tubing, but they are not ideal for larger cuts or precision work. The blades can easily dull and may require frequent replacement.

Angle Grinders with Diamond Blades

Angle grinders equipped with diamond blades can be used to cut PEX tubing quickly and efficiently. However, it requires more skill and care to ensure a clean and safe cut. Safety goggles and breathing protection are essential when using this method.

Table: Comparison of Specialized Tools for Cutting PEX Tubing

Tool	Precision	Ease of Use	Suitability for Large Cuts	Cost
Pipe Cutters	Excellent	Easy	Yes	Moderate to High
Shears	Good	Easy	No	Low to Moderate
Utility Knives	Poor	Easy	No	Low
Angle Grinders with Diamond Blades	Excellent	Requires Skill	Yes	High

Troubleshooting Cutting Issues

9. Scissors Not Cutting PEX Cleanly

Causes:

Blunt or damaged scissors
Insufficient force or improper technique
PEX pipe is too thick or hard

Solutions:

Step 1: Sharpen or Replace Scissors

Use a sharp pair of scissors specifically designed for cutting PEX. Dull or rusty scissors will struggle to make clean cuts.

Step 2: Apply More Force and Use Proper Technique

Hold the scissors at a 90-degree angle to the PEX pipe. Apply firm pressure and slowly cut through the material. Avoid using quick, jerky movements.

Step 3: Choose Suitable Cutting Tool

For thicker or harder PEX pipes, consider using a tubing cutter or pipe shears. These tools provide greater cutting force and precision.

Step 4: Check PEX Pipe Thickness

Ensure that the PEX pipe is within the recommended thickness range for your cutting tool. Excessively thick PEX may require a more powerful cutter.

Step 5: Apply Lubrication

In some cases, lubricating the PEX pipe with a light oil or water-based soap can reduce friction and improve cutting efficiency.

PEX Design Considerations

PEX Joints

PEX joints are made by inserting a PEX fitting into the end of a PEX pipe and securing it with a crimp ring or clamp. Crimp rings are the most common type of joint, and they are made of stainless steel or copper. Clamps are also made of stainless steel or copper, but they are typically used for larger diameter PEX pipes.

PEX Fittings

PEX fittings are available in a variety of shapes and sizes, including elbows, tees, and couplings. They are also available in different materials, including brass, plastic, and stainless steel. The type of fitting that you need will depend on the application.

PEX Tools

There are a variety of tools that are used to install PEX piping, including crimpers, cutters, and expanders. Crimpers are used to crimp the crimp rings that secure the PEX fittings to the pipes. Cutters are used to cut the PEX pipe to length. Expanders are used to expand the end of the PEX pipe so that it can be inserted into the fitting.

PEX Installation Tips

Always use a sharp cutter to cut PEX pipe. A dull cutter will crush the pipe and make it difficult to insert into the fitting.
Be sure to insert the PEX pipe into the fitting all the way. If the pipe is not inserted all the way, it may leak.
Tighten the crimp ring or clamp securely. If the crimp ring or clamp is not tightened securely, the joint may leak.

PEX Troubleshooting

If you have a leak in a PEX joint, the first thing to check is the crimp ring or clamp. If the crimp ring or clamp is loose, tighten it securely.
If the crimp ring or clamp is tight, the next thing to check is the PEX pipe. If the PEX pipe is damaged, it will need to be replaced.

PEX Advantages

Easy to install: PEX is flexible and easy to work with, making it a good choice for do-it-yourselfers.
Durable: PEX is made of a strong, durable material that is resistant to corrosion and UV rays.
Versatile: PEX can be used in a variety of applications, including residential, commercial, and industrial.

PEX Disadvantages

Temperature limitations: PEX is not rated for use in temperatures above 180 degrees Fahrenheit.
Chlorine sensitivity: PEX is sensitive to chlorine, which can cause the pipe to degrade over time.
Cost: PEX is more expensive than some other types of piping, such as copper.

Conclusion

PEX is a versatile and durable piping material that is easy to install and maintain. It is a good choice for a variety of applications, including residential, commercial, and industrial.

PEX Joint Type	Description
Crimp Ring	A stainless steel or copper ring that is crimped around the PEX pipe and fitting to secure the joint.
Clamp	A stainless steel or copper clamp that is tightened around the PEX pipe and fitting to secure the joint.

The Best Way to Cut PEX

PEX (cross-linked polyethylene) is a type of plastic pipe that is commonly used for plumbing. It is flexible, durable, and easy to install, making it a great choice for both residential and commercial applications. However, cutting PEX can be a bit tricky if you don’t have the right tools and techniques.

The best way to cut PEX is to use a sharp, dedicated PEX cutter. PEX cutters are designed specifically to cut PEX without crushing or deforming the pipe. They are available in a variety of sizes and styles, so you can choose the one that best fits your needs.

To use a PEX cutter, simply insert the pipe into the cutter and squeeze the handles. The cutter will automatically cut through the pipe without leaving any burrs or rough edges.