If you have received or purchased a circular saw and are preparing to use it, one necessary step will be mounting your saw’s blade for the first time.

Knowing how to put a blade on your circular saw will come in handy because every so often you will need to replace a blade that becomes dull after use. After all, a saw is only as good as its cutting blade. Bad blades translate into bad cutting performance with rough and inaccurate cuts.

Another good reason to know how to mount a cutting blade is that if you plan to cut various materials, you’ll need to mount a specific blade for cutting a specific material. Differing blades will perform various cuts like cross cuts, finish cuts, rough cuts, and perhaps rip cuts. So, unless you have different saws with different blades for every material you need to cut, it’s important that you can put a blade on your circular saw with relative ease.

cutting the wood in a blade

How to Put a Blade on a Circular Saw for the First Time

Follow this step-by-step guide to mount your circular saw blade.

Step 1: Preparing Your Saw

Unwrap your saw and remove any packaging. Place your saw on a worktable or workbench. If you have tried out your saw to see if it runs without the blade by plugging it in, make sure that it is not plugged into any power source or has a battery. You do not want it to accidentally turn on as you are mounting a blade for the very first time.

have a lot of blades in a picture

Step 2: The Correct Blade

Depending on what you intend to use your saw to cut during its first use, make sure you have the correct blade. Also, consider that if you have purchased a specific type of blade for the saw’s first operation and not the blade provided with the saw, it must, in any case, be the correct size. Remember that a ten-inch blade circular saw needs a ten-inch blade.  Each circular saw unit requires the same sized blade. Never attempt to place a different-sized blade on your circular saw.

cutting a wood in the blades

Step 3: Secure the Blade Guard

Circular saws come equipped with blade guards. Pull the blade guard back to expose where the blade needs to be mounted. 

Step 4: Loosening the Saw’s Arbor Nut

A circular saw usually will come with a wrench that is used for loosening the arbor nut. Using this wrench loosen the arbor nut. If your saw is a direct-drive circular saw, the wrench should be rotated in a counterclockwise direction for loosening. If the saw is a worm-drive unit, rotate the wrench in a clockwise direction to loosen the arbor nut.

Step 5: Mounting the New Blade

Slide in the new circular saw blade into the arbor nut’s slut and begin to tighten the arbor nut. Do not overtighten your arbor nut, because it will tighten up some when you begin cutting. It is sufficient to tighten it firmly

Tip: Get the blade rotation direction correct. Mounting a circular blade so that it rotates in the correct direction isn’t merely positioning the blade according to the side you seeThe direction of the teeth for cutting should point upward. Saw blade manufacturers use blade covers that feature an arrow indicating the direction in which the motor rotates. Also, a directional arrow will appear on the saw blade as well. When you install your new saw blade, verify that both arrows match directions. With right-side blade saws, blade labels will normally face outward, whereas, with left-side blade models, the ugly side of the blade will face outward and be visible. In any case, keep saw blade teeth facing upward.

Step 6: Test Your Circular Saw

Once you have completed mounting the saw blade for the first time, connect your circular saw to a power source by plugging it in or by inserting batteries. Perform a test run to verify that the saw is running correctly and that it is cutting correctly. If so, you have successfully mounted your circular saw blade for the first time.


Always check any manufacturer’s recommendations when setting up or using your saw for the first time, including putting on a saw blade.

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