Best Metal Blade Brush Cutters for Thick Brush
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A metal blade brush cutter is a steel or carbide blade that replaces a nylon string head on a trimmer or brush cutter, so it can cut through thick weeds, saplings and tough brush that string wears down on. The blades below are all listed as brush cutter or metal weed wacker blades, and each section uses only the facts printed in its listing: size, teeth, steel type, thickness, arbor fit, included parts and safety notes. Fit is the first thing to check. A blade that does not match your trimmer’s shaft will not mount, and a blade that is too large can strike the guard or the ground.
Quick answer
- Check the arbor size on your trimmer first. The listings in this group use 1-inch (25.4 mm) or 20 mm bores, and some name the adapter kit as included.
- Choose the steel to match the work. SK5 steel and 65 manganese steel appear most often in this group, and carbide appears in the MTR kit and in one circular-blade listing.
- Pick the diameter for the growth you cut. The listings range from 6-inch circular blades to 12-inch and 355 mm metal blades.
- Keep the guard in place and power off when you change the blade. Several listings say this in direct terms.
What makes a blade a metal blade
A metal blade has rigid cutting edges that strike and cut stems. A nylon string bends away from a stem, so it works poorly on saplings and woody growth. A metal blade cuts with the edge, which is why it handles thick brush better. The trade-off is that a metal blade is heavier, has more kickback risk if it strikes a hard object, and needs the guard in place at all times.
Blade shape also changes the work. A flat multi-tooth blade with three or more cutting edges is the most common brush style. A circular saw-style blade has more teeth and cuts woody stems. A serrated or straight-edge blade is used for dense weeds and grass. The listings in this group include all three styles, so read the description and teeth count carefully before ordering.
Steel type and durability
Several listings name SK5 steel. The ChoirLingo listings describe SK5 as a premium steel with a higher hardness than many standard products, and they say the blades can be resharpened. Another listing describes 65 manganese steel that is heat-treated and resists chipping. The Dunhil pack is listed as carbon steel. The MTR listing and one circular-blade listing describe carbide construction for woody material.
The listings do not give hardness ratings, so compare the material names and the job you have in mind. For thin grass and light weeds, a standard steel blade is usually enough. For brambles, saplings and stones in the path, a heavier steel or a carbide tip is the better fit. Always keep a blade that is cracked, bent or heavily worn out of service.
The eight blades
1. ChoirLingo SK5 steel brush cutter blades, 2-pack, model BCB-01
This pack contains two brush cutter blades in SK5 steel, listed at 2 millimeters thick. The listing gives a product dimension of 12.01 by 3.54 inches and names compatibility with Husqvarna, Stihl, Oregon and Hitachi devices. Its highlight line describes the blades as reversible and easy to resharpen, and it says they cut thick brush and small saplings. The listing gives the part number as Cut-2pcs01 and the material as alloy steel. This pack suits a buyer who wants two spare blades in one order and expects to resharpen them.
2. ChoirLingo SK5 brush cutter blades, 2-pack, 355 mm
This pack contains two 355 mm blades in hardened SK5 steel. The listing describes them for heavy-duty thick weed and brush cutting, and it says they can handle dense grass, vines and overgrown areas. The product dimension is 13.98 by 3.54 by 0.08 inches, and the item weight is 1.74 pounds. The listing says the blades can be resharpened with a grinder, which lengthens their life. It also presents the blades as a replacement for nylon trimmer line on thick growth. Choose this size for taller, tougher cutting than the 12-inch pack.
3. ChoirLingo serrated SK5 brush cutter blades, 12-inch, 2-pack
This pack contains two 12-inch serrated blades in SK5 steel. The listing gives the product dimension as 12.68 by 3.94 by 0.51 inches and the item weight as 1.81 pounds. It uses the same wording as the 355 mm pack about thick tough weeds, vines and overgrown ground, and about resharpening. The serrated edge is the feature to note here. The listing describes the cut as aggressive and less likely to tangle with vines, which suits a buyer who fights tangled growth with string now.
4. Brush cutter blade, 300 mm, 65 manganese steel
This single 300 mm blade is made from 65Mn steel and listed at 4 mm thickness, which is the heaviest blade in this group by that measure. The listing describes it for bamboo, dry weeds, vines and thick brush, and says it can be resharpened for repeated use. It says the blade has a standard mounting hole and fits most universal brush cutters and string trimmers. The listing recommends it for 26cc or larger gas trimmers, or 18V and larger electric weed eaters. Check your engine size or voltage against that line before ordering. The product dimension is 13.07 by 4.69 by 2.09 inches, and the item weight is 2.01 pounds.
5. Dunhil metal brush cutter blade, 3-pack with two adapter kits
This pack lists three blades: a 9-inch 20-tooth blade, a 9-inch 36-tooth blade and a 10-inch 80-tooth blade. It includes two adapter kits. The listing describes carbon steel construction with impact and wear resistance, and it says the blades are designed for trimmers with a 1-inch arbor. It notes a maximum rotation speed of 10,000 RPM and recommends heavy duty leg protectors and eye protection during operation. The listing’s specification fields show a different size, a 7-inch 16-tooth pack, which does not match its title. Confirm the blade sizes in the description and the item you receive before relying on this pack for a specific job.
6. Manganese stainless round saw blades with lawn mower wrench, 7-piece set
This set contains two circular saw blades, a lawn mower wrench, two nuts and two shims. The listing gives the blade diameter as 6 inches, the aperture as 5 mm and the thickness as 1.1 mm. One bullet describes the blades as carbide tipped, while the title describes manganese stainless steel, so the listing is not consistent on the material. The listing says the blades suit lithium battery weed whackers, cordless mowers and other trimmers, and it advises turning the power off before changing the blade. It also warns not to remove the weed eater guard and use the blade. These are circular blades for brush and small branches, not general-purpose trimmer heads.
7. Manganese stainless saw blade attachments with 4-tooth brush blades
This set contains three manganese stainless circular saw blades, four 4-tooth steel brush cutter blades, a wrench, two nuts and a shim. The listing describes a 6-inch circular blade for thicker brush and branches, and 4-tooth blades for lawns, weeds and small branches. It names the TWRSHE multifunction weed eater and similar weed wackers as the target trimmers. The listing says to use a screwdriver to swap blades, and it tells the buyer to tighten the screws and check the stone clearance. It also advises keeping the blades in their original packaging with oil after use. Confirm the dimensions before purchase, since the listing says so.
8. MTR saw chain tooth brush cutter blades, 9-inch 2-pack kit
This kit includes two 9-inch saw chain tooth blades with a universal adapter setup. The listing describes carbide construction for heavy-duty work on small trees and thick growth, a maximum speed of 10,000 RPM, and a design that fits most gas and electric trimmers. It says the blades can be sharpened with a round file. The title also mentions 7-inch and 9-inch sizes, and the listing says the kit ships ready to go with everything in one package. This kit is the choice for a buyer who wants carbide teeth and a sharpenable chain-tooth design in one order.
Who each blade suits
A buyer who mostly cuts grass and light weeds should look at the SK5 two-packs or the 300 mm blade, depending on the trimmer’s power. The 12-inch serrated pack suits open ground with vines and tall weeds, and the 355 mm pack suits heavier overgrowth. A buyer who clears saplings and woody growth should look at the carbide-tipped sets, including the MTR kit and the multi-blade sets with a carbide option. A buyer who wants a range of cutting styles in one purchase should compare the Dunhil three-pack and the manganese stainless attachments.
Pick a single blade if you already know your trimmer and your cutting work. Pick a set if you want spares or a range of tooth styles. In either case, the arbor size on the trimmer decides which listings are possible.
Safety before you change or run a metal blade
- Turn off the trimmer and remove the battery or disconnect the power before you change the blade. The listing for the 7-piece set says to keep the power off.
- Keep the guard in place. The 7-piece listing warns that the guard must not be removed to use the blade.
- Wear eye protection, gloves and sturdy leg protection. The Dunhil listing recommends heavy duty leg protectors and eye protection.
- Clear stones, wire and debris before cutting. The stainless attachment listing warns about stones and says to keep clear of them.
- Replace any blade that is cracked, bent or heavily worn. A damaged blade can break in use.
Keeping a metal blade in shape
Several listings say the blade can be resharpened. Sharpen with a round file or a grinder, keep the edge even, and check the balance after sharpening. A blade that is out of balance vibrates hard and can damage the trimmer. Our guide to checking a mower blade for balance covers the basic check, and our guide to sharpening a mower blade safely covers the steps.
After use, clean sap and grass from the blade, dry it, and store it with a light coat of oil. The stainless attachment listing advises keeping the blades in their original packaging with oil. Storing blades flat and dry prevents rust on steel blades, and it keeps a carbide-tipped blade safe from knocks.
FAQ
Will a metal blade fit any trimmer?
No. A metal blade mounts to a trimmer’s drive shaft, and the listings name 1-inch and 20 mm bores. Check the arbor size and the mounting type before you buy, and read the compatibility line. The 300 mm listing says it fits most universal brush cutters and string trimmers, but it also gives an engine size and voltage recommendation.
What is the difference between SK5 steel and 65 manganese steel?
The listings name both materials. The SK5 listings describe a high-hardness steel that can be resharpened, and the 300 mm listing describes 65Mn steel that is heat-treated and rated for thick brush. The listings do not give a side-by-side hardness test, so judge by the job and the blade thickness.
Can I cut saplings with a metal blade?
Several listings say so. The MTR listing and the carbide-tipped sets name saplings and small trees. Keep the cut within the blade’s diameter, and do not use a brush cutter blade as a substitute for a saw on large wood.
Why do some listings mention a guard?
The guard protects you from thrown debris and from the blade itself. The 7-piece listing says not to remove the guard, and the Dunhil listing calls for eye protection and leg protection. Keep the guard in place for every blade on this page.
How do I know when to replace a blade?
Replace a blade that is cracked, bent, or worn to a point where it no longer cuts cleanly. Several listings say the blades can be resharpened, so a dull edge is not always a reason to replace. Any crack or bend is a reason to stop using the blade.
Bottom line
A metal blade brush cutter is the right tool when string cannot cut the growth you face. Match the arbor first, then choose the steel and the diameter for the work. The SK5 packs suit resharpening and general thick brush, the 300 mm blade suits heavier brush on larger trimmers, the carbide and chain-tooth kits suit saplings and woody growth, and the multi-blade sets suit a buyer who wants more than one cutting style. Keep the guard in place, and turn the power off before every blade change.
For a related check before cutting, read how to check a mower blade for balance, and see how to sharpen a mower blade safely for the sharpening steps.
