How to Replace a DeWalt Cordless Brush Cutter Blade
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A DEWALT brush cutter blade replacement starts with safety. Remove the battery or cut the power first, wear gloves and eye protection, remove the blade or head hardware in the order your manual shows, and fit the new blade with the same arbor size and orientation as the old one. Most replacement listings in this group name a DEWALT model or a 25.4 mm center hole, so match those two details before you buy. This guide walks through the steps, the checks that prevent a poor fit, and the blade types the product pack describes.
Quick answer
- Remove the battery, or turn the tool off and disconnect power, before you touch the blade.
- Check your tool’s model number and the center hole size (the listings give 25.4 mm, or 1 inch) before buying a replacement.
- Match the blade type to the job: multi-tooth blades for grass and weeds, and carbide-tipped saw blades for heavier brush.
- Follow the order in your DEWALT manual for guards, nuts and flanges, because mounting hardware differs by model.
Before you start: safety and tools
A brush cutter blade is a sharp metal cutting edge that spins at high speed. Before you change it, take the tool out of service. The most important step is to remove the battery from the tool so it cannot start while your hands are near the blade. If the tool uses a cord rather than a battery, unplug it. This is not optional. A 7-piece blade listing in the pack (the CGNRONEAU kit, which is not one of the six options below) advises that you keep the power off when you change blades and never run the tool with the guard removed. The same listing says a blade is very sharp and recommends gloves for the job.
DEWALT publishes a power tool safety page with sections on personal safety for power tool use, care and service. The page lists those topics as headings, so use it as a starting point and read the full text in your owner’s manual. Wear work gloves, eye protection and closed shoes, and work on a flat, stable surface with the tool resting on its guard or on a bench.
Gather a few tools before you begin. Most DEWALT brush cutter heads use a wrench or a socket for the retaining nut, and some blade kits include a hex wrench and a socket wrench. The KISHACZ and IKDFGDSG listings in the pack, for example, name a hex wrench or a socket wrench as part of the kit. Keep the small parts in a dish so none of them are lost.
Step-by-step: replacing the blade
The exact sequence depends on the model, so use your manual for the final word. The general sequence below matches what the blade listings describe for their own installation.
- Remove the battery and confirm the tool cannot start. Pull the battery and press the trigger briefly to be sure nothing happens.
- Lay the tool on a stable surface. Keep it flat, with the cutting head supported so it will not roll.
- Note how the old blade sits. Take a photo or make a small sketch of the blade, the flange or cup, the washer and the nut. Note which face of the blade points out.
- Remove the retaining nut and the old blade. Hold the head still with the wrench that comes with the kit or the tool, and loosen the nut in the direction your manual shows. Lift off the blade and any spacer.
- Check the arbor and the center hole. The listings in this group describe a 25.4 mm (1 inch) center hole. Clean the arbor and wipe off grass and dirt so the blade seats flat.
- Fit the new blade. Put the blade on the arbor in the same orientation as the old one, add the cup, washer or flange in the order you noted, and tighten the nut firmly. Do not overtighten a thin nut, and do not run the tool with a loose nut.
- Spin the blade by hand. With the battery still out, turn the blade by hand. It should turn freely and should not wobble or touch the guard.
- Reinstall the guard and battery. Confirm the guard is in place before you put the battery back.
How to check fit before you buy
Blade listings in the pack give three checks you can make before you order. First, the model. Several listings name a DEWALT model, such as DCBC580, DCBC581B, DCST970, DCST972 or DWOAS5BC, and one names a FLEXVOLT DCM571. A listing that names your exact model is the safest choice. Second, the center hole. Listings describe a 25.4 mm (1 inch) arbor, which is common, but the listing still says to compare the hole and blade diameter with your equipment. Third, the blade diameter. Listings give blade sizes such as 6 inch, 9 inch and 250 mm, so measure your current blade before you order.
If a listing says only that it “fits many” brush cutters, treat that as a general statement and check the blade size and hole yourself. The WaanGar listing in the pack describes a blade for a DCST990 trimmer and recommends replacing worn blades as a complete set. A set approach keeps the cutting balance even, which the listing says matters for smooth operation.
Blade types the pack describes
The blades in this group fall into a few families. Matching the family to the job matters more than matching the maker of the blade.
- Multi-tooth blades for grass and light weeds. The Trrisaun 4-tooth blade for the DCBC580 is described as manganese steel with four sharpened edges for tall grass, dense weeds, small shrubs and light brush. The LONCHZN 3-tooth blade for the same DCBC580 model is described as a one-piece body with three fixed cutting sections.
- Pivoting metal blades. The Trrisaun 6-blade head for the DCST925M1 is described as six movable blades on a 25.4 mm center hole. The generic DCST972X1 blade kit lists six pivoting metal blades with mounting cups, washers and adapters.
- Two-tooth blades for trimming. The 2PCS blade kit for the DCST972B lists a 9-inch two-tooth blade with a 25.4 mm arbor and a mounting kit, described for routine grass trimming and weed cutting.
- Carbide-tipped saw blades for brush. The IKDFGDSG kits for the DWOAS5BC and DCST970X1 list 36 carbide-tipped teeth on a 9-inch steel body, and the listing says to use them only with a brush cutter approved for metal saw blades and within the equipment’s rated cutting capacity.
- Tri-blade for the DCM571. The DEWALT DEWDT20653QZ listing describes a replacement tri-blade for the FLEXVOLT DCM571, sized at 250 mm in the listing text.
The six replacement options in this roundup
Each option below is taken from the pack. Where a listing gives a fitting claim, this guide repeats it as the listing’s claim. Verify the fit against your model before you buy.
Trrisaun 4-tooth brush cutter blade for DCBC580 (B0HCVH4LNL)
The listing names the DEWALT DCBC580 for 2025 to 2026 and describes manganese steel construction with a four-tooth design. It is presented as a replacement for worn or damaged cutting blades and as a detachable part that the listing says is easy to install and store. It suits a reader whose current blade is a multi-tooth design and who needs a like-for-like replacement for the DCBC580.
LONCHZN 3-tooth brush cutter blade for DCBC580 (B0HJFVWWCN)
This listing also names the DEWALT 60V MAX brush cutter series DCBC580. Its distinguishing point is the one-piece fixed blade body with three cutting sections, which the listing contrasts with heads that have separate swinging cutters. The listing gives a 1-inch (25.4 mm) center hole and advises comparing the blade diameter and your equipment specifications before you buy. It suits a reader who wants a fixed multi-tooth blade with no swinging parts to replace.
2PCS brush cutter blade for DEWALT FLEXVOLT DCST972B (B0HJZS8T8G)
The listing names the DEWALT FLEXVOLT 60V DCST972B for model years 2019 to 2025 and describes a 9-inch two-tooth blade. It includes the mounting accessories the listing describes as a complete kit for a 25.4 mm arbor. The listing describes the blade as made from steel with a sturdy design for routine trimming. Because the listing calls out the model year range, check your tool’s year before you order.
KISHACZ brush cutter blade kit for DCST970 and DCST972 (B0HMV8Q63C)
This kit is listed for the DeWalt DCST970 and DCST972 and is described as a metal replacement blade kit for grass trimmer and brush cutter use. The listing says to check your equipment model, blade dimensions and mounting compatibility before purchase. Its bullets describe the kit as a practical option for replacing worn cutting components, which makes it a reasonable choice for a reader who wants a metal blade for grass and weed cutting on a DCST970 or DCST972.
IKDFGDSG brush cutter blade kit for DEWALT DWOAS5BC (B0HNVFLWVP)
This two-pack names the DEWALT DWOAS5BC brush cutter attachment from 2021 to the present. The listing describes two 9-inch blades with 36 carbide-tipped teeth, a 1-inch center hole and mounting hardware, including a hex wrench and a socket wrench. It is aimed at brush clearing rather than grass trimming, and the listing advises using it only on a brush cutter approved for metal saw blades. Read the rated cutting capacity in your manual before you use it on thick growth.
DEWALT DEWDT20653QZ brush cutter tri-blade (B06XTK2QGY)
This listing is branded DEWALT and describes a replacement brush cutter tri-blade for the FLEXVOLT DCM571. The listing text gives a 250 mm blade size and says the blade is for cutting and clearing grass and tough weeds and thorny hedges. The listing does not state a compatibility claim for the DCBC580 or DCST models, so do not assume it fits other DEWALT heads. This is the closest option in the group to a genuine DEWALT part, but the listing still asks you to confirm the model before buying.
Review: the DEWALT tri-blade in more depth
The tri-blade is the easiest option to explain because its listing is short and specific. It is named as a replacement for the FLEXVOLT DCM571, it is sized at 250 mm, and its listing text ties it to cutting weeds and thorny hedges. A tri-blade has three cutting edges on one plate. That shape suits a reader who wants a DEWALT-branded replacement and works mainly on weeds and hedge growth, rather than long grass.
Replacing it follows the general sequence above. Remove the battery first, lay the head on a stable surface, note the orientation of the old blade, remove the retaining hardware, fit the new tri-blade on the same arbor, tighten the nut, and spin the head by hand before you refit the guard. The listing does not give a torque figure or a blade life, so do not expect one from the pack.
The main limit is fit. The listing names the DCM571 and does not state a fit for other models. Check the model on your tool before you order, and compare the blade length with the old blade. If your model is not named, one of the kits above with a named model may be the safer choice.
Common mistakes to avoid
- Changing the blade with the battery still in. Remove the battery first every time.
- Buying by brand alone. Many listings are generic and name a model, so check the model and the center hole.
- Mixing blade families. A saw blade is meant for brush clearing, and a multi-tooth or trimming blade is meant for grass and light weeds.
- Skipping the guard. The CGNRONEAU listing in the pack says the guard should not be removed to use its blade.
- Replacing one blade of a set. The WaanGar listing recommends replacing worn blades as a complete set to keep the cutting balance even.
FAQ
How do I know which blade my DEWALT brush cutter takes?
Start with the model number on the tool’s label, then check your owner’s manual for the approved blade and head types. The listings in the pack name specific DEWALT models, including DCBC580, DCBC581B, DCST970X1, DCST972B, DCST990, DCST925M1 and DWOAS5BC, so a named model is the first thing to match. If your model is not named, measure the arbor and blade diameter and compare them with the listing.
What is a 25.4 mm center hole?
It is the size of the hole in the middle of the blade or head that fits over the drive arbor. Several listings state a 25.4 mm hole, which equals 1 inch. A hole that does not match will not seat correctly, so check it before you buy.
Can I use a saw blade on a brush cutter?
Some listings describe carbide-tipped saw blades for brush clearing. The IKDFGDSG listing says to use them only on a brush cutter approved for metal saw blades and within the equipment’s rated cutting capacity. Use your manual to confirm that your head is rated for saw blades before you fit one.
How often should I replace a brush cutter blade?
The pack does not give a replacement interval. Replace a blade when it is bent, cracked, chipped or worn down, and replace a set together when the listing says so. Inspect the blade before each use.
Do I need special tools to change the blade?
Some kits include a hex wrench and a socket wrench, and the IKDFGDSG kits list those tools. Other listings do not state included tools, so check what your kit contains and keep the wrench that came with your tool.
Is a replacement blade from another brand safe to use?
A replacement blade from another brand can fit, but the listing must match your model and the blade must be rated for your tool. Listings that say “fits many” are general statements, so verify the arbor, the blade size and the rated use before you run the tool.
Bottom line
Replace a DEWALT brush cutter blade with the battery removed, gloves on and the guard in place. Match the blade to your model and the 25.4 mm center hole, match the blade family to your job, and spin the head by hand before you start the tool. For a model-specific replacement, pick a listing that names your exact DEWALT model. For heavier brush, use a carbide-tipped saw blade only if your head is approved for it.
Related reading
If you are deciding between a brush cutter and a string trimmer for the job, read our guide on brush cutter vs string trimmer. For a general look at swapping mower blades, see how to replace an electric lawn mower blade.
