Best Brush Cutter Blades for String Trimmer Use
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A brush cutter blade for string trimmer use is a metal blade, usually carbon steel or carbide-tipped, that bolts onto a straight-shaft trimmer in place of the nylon line so the machine can cut saplings, thick weeds and woody stems. Before you buy one, confirm two things: the blade’s arbor fit, which is most often 1 inch (25.4 mm) or 20 mm, and whether the included adapter kit matches your trimmer’s gear case. The six blades and blade kits below are the ones in our product data that state those details clearly enough to compare.
Quick answer
- For light brush and small saplings on a straight-shaft trimmer, a 9-inch or 10-inch blade with 20 to 36 teeth is the usual choice. The listings give 20-tooth and 36-tooth 9-inch options.
- For the most aggressive cutting of woody growth, a carbide-tipped 80-tooth 10-inch blade is described for brush and weed cutting, and it is not described for trees or wood.
- For a kit that covers several blade sizes, a multi-blade set with two adapter kits gives you more options for one trimmer.
- Check the arbor size and the adapter kit before ordering, and check that your trimmer is a gas straight-shaft model, since several listings here are written for that type.
How to choose a brush cutter blade
Start with the drive shaft on your trimmer. Most of the blades in this group say they fit trimmers with a 1-inch (25.4 mm) arbor or a 20 mm arbor, and several include a universal adapter kit with thrust washers, rider plates, collar nuts and wrenches. A blade that does not match the arbor will not seat, and an adapter that does not match the gear case can throw the blade off balance. The listings for these products name specific trimmer brands such as Stihl, Husqvarna, Ego, Oregon, Hitachi, Makita and Honda. If your brand is not on the list, check the owner’s manual or the listing’s arbor line before buying.
Next, match the tooth count to the job. A blade with fewer teeth and a wider gullet is generally used for cutting larger stems, while a finer toothed blade cuts smoother on brush. The listings in this group give tooth counts of 20, 36 and 80 for the saw-type blades, and they describe the 80-tooth carbide blade for brush and weed cutting and the 20-tooth chainsaw-tooth blades for weeds, brush and light trees. The listings do not say which tooth count suits a particular stem diameter, so use the tooth count as a guide to the kind of growth and check the manufacturer’s recommendations for your model.
Materials and durability
Blade materials differ in this group. The 9-inch and 10-inch blades from one maker are carbon steel, described as rust resistant and fine grade. Several kits use manganese steel bodies with carbide-tipped teeth, which the listings describe as wear resistant and better for woody material. One listing describes a 65Mn steel blade. The carbide-tipped blades are the better choice when you expect to cut dense brush, because one listing says carbide blades resist dulling in tough conditions. Wire heads are a separate category, and they wear as they cut, so a steel wire head is a consumable part.
Safety is part of the choice. The listings tell you to wear safety glasses and protective gear when using a brush cutter blade. One 80-tooth listing also says that high rotating speed requires heavy duty leg protection and eye protection during cutting. Keep the power off when you change a blade, and do not run the machine with the guard removed. One listing for a 7-piece set states that the power must be off when you change a blade and that the guard must not be removed.
Roundup: six brush cutter blades and blade kits
1. Chainsaw-tooth brush blades, 9-inch 20-tooth, two-set
This two-set pack has 9-inch, 20-tooth chainsaw-tooth blades made from fine-grade, rust-resistant carbon steel. The listing says the blades fit most straight-shaft trimmers with a 1-inch (25.4 mm) arbor or a 20 mm arbor, and it gives a maximum RPM of 10,000. Two adapter kits are included: the first is for Stihl trimmers, with a thrust washer, rider plate, collar nut and screwdriver, and the second is for straight-shaft trimmers. The package also includes three round files and four washers. The bullets name compatibility with Stihl, Ego, Oregon, Honda and Hitachi trimmer models.
Best for: a 9-inch blade for brush and saplings on a trimmer that takes a 1-inch or 20 mm arbor. Not for: a trimmer with a maximum RPM lower than 10,000.
2. Chainsaw-tooth brush blades, 10-inch 80-tooth carbide, two-pack
This two-pack gives two 10-inch blades with 80 carbide-tipped teeth, made of stainless steel with carbide edges, according to the bullets. The listing says the blades fit most gas or electric straight-shaft trimmers with a 10-inch by 1-inch arbor or a 20 mm arbor. Compatible brands named include Husqvarna, Stihl, Ego, Oregon and Hitachi. The set includes two round files for maintenance, four washers and two complete universal adapter kits. The listing says the 80-tooth carbide blades cut and prune without needing excessive pressure, and it describes them for thick weeds and brush. High rotating speed requires heavy duty leg protectors and eye protection, the listing says.
Best for: buyers who want an 80-tooth carbide blade for brush and weeds with two adapter kits in one pack. Not for: cutting trees or wood, which the carbide blade listings do not describe.
3. Brush cutter blade and adapter kit, 9-inch 20T, 9-inch 36T and 10-inch 80T
This kit includes three circular blades: a 9-inch 20-tooth blade, a 9-inch 36-tooth blade and a 10-inch 80-tooth blade, all carbide-tipped and made of manganese steel. The listing says the kit is for straight-shaft trimmers with a 1-inch arbor, and it names a wide range of gas and electric trimmers, weed eaters and brush cutters. Two sets of universal adapter hardware are included, with thrust washers, collar nuts and wrenches. The listing excludes ECHO SRM series machines. The bullets describe the blades as suited to trimming trees, cutting thick grass, string and underbrush.
Best for: buyers who want three blade sizes in one kit, with a choice of tooth counts for different growth. Not for: ECHO SRM series trimmers, which the listing excludes.
4. Brush cutter blade adapter kit, 10-piece set for Stihl-style trimmers
This 10-piece set is mainly an adapter kit with a carbide-tipped blade. The listing gives two adapter sets: the first includes a thrust washer with 10 teeth, a rider plate, two collar nuts, an L-wrench and a T-wrench, and the second includes a thrust plate guard washer with 6 teeth and related parts. The collar nuts have inside diameters of about 0.315 inch and 0.3 inch. The listing gives a list of Stihl model numbers that it says fit, including FS56, FS70, FS110 and FS250, along with several other Stihl brushcutter models. The listing says the blade kit is made of carbide-tipped material, which it describes as sharper and more durable.
Best for: owners of a Stihl-style trimmer who need replacement adapter hardware along with a blade. Not for: trimmers whose model is not on the listing’s fitment list, unless you confirm the arbor and collar fit first.
5. Gashwer 10-inch steel wire brush cutter blade set
This set provides a 10-inch steel wire rotary brush cutter head, sold with a universal adapter kit for straight-shaft string trimmers. The listing says it fits most gas and electric straight-shaft trimmers with a 1-inch arbor, and it describes a two-pack of adapter kits with thrust washers, a rider plate, collar nuts, a screwdriver and L and T wrenches. The bullets say the wire is high-quality carbon steel and that the head is used for trimming tight and paved corners, clearing moss and removing stubborn weeds. The listing says to check the model before buying and to make sure the brush fits your trimmer. The listed model is US-10 inch.
Best for: a wire brush blade for edges, corners and moss on a straight-shaft trimmer. Not for: woody stems, which the listing does not describe.
6. Steel wire brush head, 10-inch, with adapter kit
This is a 10-inch rotary steel wire head rather than a toothed blade. The listing says the wire is 0.50 mm spring carbon steel, and that the steel discs are double-layered stainless steel. The head fits straight-shaft trimmers with a 25.4 mm arbor and includes two adapter kits, one with thrust washers, a rider plate, collar nuts and wrenches, and one with a thrust plate guard washer. The listing says the head is for trimming tight and paved corners, clearing moss, removing weeds between bricks and removing rust. It also warns that wire blades are consumable and can be damaged by hitting large rocks, and that the head is not intended to replace lithium-ion lawn mower blades.
Best for: a wire head for edges, corners and moss, not for woody stems. Not for: woody brush or any job the listing does not describe.
Comparison table
| Product | Blade type | Size and teeth | Arbor fit | Max RPM or other stated figure |
|---|---|---|---|---|
| Chainsaw-tooth two-set | Carbon steel | 9 inches, 20 teeth | 1 inch or 20 mm | 10,000 RPM |
| Two-pack 80T carbide | Carbide tip | 10 inches, 80 teeth | 1 inch or 20 mm | Not stated |
| Three-blade kit | Manganese steel, carbide tip | 9 inches 20T, 9 inches 36T, 10 inches 80T | 1 inch | Not stated |
| Adapter kit set | Carbide-tipped blade | Not stated | Stihl-style fit | Not stated |
| Seven-piece round set | Manganese steel, carbide tip | 6 inches saw blade | 5 mm aperture | Not stated |
| Wire brush head | Steel wire | 10 inches | 25.4 mm | Not stated |
Mistakes to avoid
- Ordering a blade without checking the arbor. The 1-inch and 20 mm sizes are both listed, and the adapters differ.
- Using a carbide-tipped blade on trees or wood. The carbide listings describe brush and weeds only.
- Changing a blade with the machine running. The listings say to keep power off and not to remove the guard.
- Expecting a wire head to cut woody stems. The wire head listing describes edges, moss and rust.
- Assuming a blade fits an ECHO SRM series trimmer. One kit lists ECHO SRM series as an exception.
FAQ
Which arbor size do I need for a brush cutter blade?
Most blades in this group state a 1-inch (25.4 mm) arbor, and several also fit a 20 mm arbor with an adapter. Check the arbor on your trimmer’s drive shaft or in the owner’s manual. If a listing says it fits either size, the included adapter kit should cover that size.
How many teeth should a brush cutter blade have?
The listings do not give a single correct count. In this group the tooth counts are 20, 36 and 80. Higher counts are described for brush and weeds, and lower counts for heavier stems. Choose the tooth count by the growth you cut most, and check the manufacturer for your trimmer model.
Can I use a brush cutter blade on a cordless trimmer?
Some listings in this group are written for cordless or battery-powered trimmers, including the seven-piece round set. Others say they are for gas straight-shaft trimmers. Read the compatibility line of each product, and match the blade to your power type and arbor.
Do I need the adapter kit that comes with the blade?
Usually yes. The adapter kit holds the blade on the drive shaft with the right washers and collar nut. Several listings include two adapter kits so you can fit different trimmer brands. Use the kit that matches your trimmer’s gear case, and do not run the blade without a secure collar nut.
How often should I replace a brush cutter blade?
The listings do not give a replacement interval. They do describe wire heads as consumable, and they say carbide teeth last longer than steel. Replace a blade that is cracked, bent or badly chipped, and check it for wear after heavy use.
Is a brush cutter blade suitable for trees?
The carbide-tipped blades in this group are described for brush and weed cutting, and one listing says they are not for cutting trees or wood. If you need to cut trees, use a tool designed for that job and follow the manufacturer’s instructions.
Bottom line
Pick the blade by your trimmer’s arbor size and the growth you cut most. A 9-inch or 10-inch chainsaw-tooth blade with a matching adapter kit suits brush and saplings on a straight-shaft trimmer. A steel wire head suits edges, corners and moss but not woody stems. Before you order, confirm the arbor, the adapter kit and the power type, and read the safety notes in each listing. For a broader look at how the two tools differ, see Brush Cutter vs String Trimmer: Which Does What, and for keeping your trimmer running safely, see How to Hold and Use a String Trimmer Safely.
