Best Round Trimmer Line for Weed Eaters and Trimmers
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A weed eater round trimmer line is the nylon filament that spins at the end of a cordless or electric string trimmer and cuts grass and light weeds. The right choice depends on three things: the trimmer head or spool your machine takes, the line diameter that head is built for, and the battery platform you already own. This guide compares six products from the product data pack for this topic. Each section sticks to what its listing states. Where a listing does not give a figure, this guide says “not stated” instead of guessing.
Quick answer
- If your trimmer is a Worx WG model, the WETOOLPLUS WA0014 listing names WG168, WG184, WG190 and WG191 as compatible, and sells 3 spools with 1 cap.
- If your trimmer is a Ryobi One+ model that takes the AC14RL3A spool, the KAKO listing gives an 11 ft spool of 0.065 inch line, sold as 12 spools and 2 caps.
- If you own a DeWalt 20V MAX battery and want a tool-only trimmer that comes with line coils, the HEINPRO listing gives a 0.08 inch line and 4 bulk coils.
- If you want a DeWalt 20V trimmer that includes spool line in the box, the Lemolifys and Lacoco listings both mention spool line in their titles, but neither lists the line diameter in the bullets.
- If you own a Milwaukee 18V battery, the MtiolHig listing names 18 extra 0.11 inch lines, but it is tool only and the battery and charger are not included.
Start with the head, not the line
Most trimmer line problems come from a mismatch between the line and the spool. A spool that is too large will not fit the head, and a line that is too thick can overload the motor or jam the feed. Before you buy any line, find the model number on your trimmer head or spool and compare it with the compatibility text in each listing. The compatibility lines in this pack are not all written the same way. Some name a model series, some name a battery brand, and some name specific model numbers. Read the full list, not only the title.
A second point to check is whether your trimmer uses a bump-feed head or a fixed-line head. Bump-feed heads release more line when you tap the head on the ground, while fixed-line heads need you to wind or replace line by hand. The guide bump-feed vs fixed-line trimmer heads explains the difference in more detail. The products below are listed by what they include, so you can match them to the head you already have.
What the listings say about line size
Line diameter is the number that matters most for fit and performance. Heavier line cuts thicker weeds and light brush, but it also puts more load on the motor. Thinner line is easier on a small motor, but it wears out faster on tough grass. The table below shows what each listing states. Where the listing does not give a figure, the table says so.
| Product | Line or spool stated | Line diameter stated | Battery and power | Included parts |
|---|---|---|---|---|
| WETOOLPLUS WA0014 spool and cap | Copolymer nylon spools for Worx WG models | 0.08 inch (listed under cutting width) | Not applicable (spool only) | 3 spools and 1 cap |
| KAKO AC14RL3A spool | Pre-wound nylon line, 11 ft | 0.065 inch | Not applicable (spool only) | 12 spools and 2 caps |
| HEINPRO cordless weed wacker | Bulk trimmer line coils (title) | 0.08 inch (listing bullet) | Battery not included; DeWalt 20V MAX compatible per listing | 4 bulk trimmer line coils (title); tool only |
| Lemolifys cordless string trimmer | 8 line spools (title) | Not stated | Battery and charger not included; DeWalt 20V MAX compatible | 8 line spools (title) |
| MtiolHig 3-in-1 trimmer | 18 extra lines (bullet) | 0.11 inch (bullet) | Battery and charger not included; Milwaukee 18V compatible | 18 extra lines; tool only |
| Lacoco cordless string trimmer | 8 pieces of spool line (title) | Not stated | Battery not included; DeWalt 18V to 21V compatible per listing | 8 pieces of spool line (title); tool only |
Two points stand out in the table. First, the diameters that are stated range from 0.065 inch to 0.11 inch, and the listings do not all use the same unit or the same position in the text. Second, several listings name the line count or spool count in the title but do not state the diameter anywhere in the bullets. In that case, the diameter is “not stated” and you should check the packaging or the original trimmer manual before buying.
Shape of the line
People searching for a weed eater round trimmer line often want to know the line shape. None of the six listings in this pack uses the word “round” to describe its line, so this guide does not claim a line shape for any product. If you need a specific shape, such as a twisted or square profile, check the product page and the packaging for that detail before you buy. What the listings do give is the diameter, the count, the battery platform and the head type, and those are the facts used in the comparison below.
Compatibility checks before you buy
Battery platform matters even for spool-only products. A spool for a Ryobi One+ trimmer will not fit a Worx head, and a spool for a DeWalt trimmer will not fit a Milwaukee head. Here is what each listing says about compatibility:
- Worx: The WETOOLPLUS WA0014 listing names WG168, WG184, WG190 and WG191. It says the spool and cap are designed to match the original WA0014 part.
- Ryobi One+: The KAKO listing names AC14RL3A spools and a long list of Ryobi model numbers for 18V trimmers, plus RY24000 for 24V.
- DeWalt 20V MAX: The HEINPRO, Lemolifys and Lacoco listings all name DeWalt 20V battery compatibility. The Lacoco listing says it works with DeWalt 18V to 21V lithium-ion packs, including several DCB model numbers.
- Milwaukee 18V: The MtiolHig listing says it is compatible with Milwaukee 18V batteries and includes a built-in fuel gauge display.
In each case the battery and charger are not included with the tool unless the listing says so. Check the battery you already own against the list before you order.
Roundup: six line and trimmer options from the pack
1. WETOOLPLUS WA0014 Spool Line and Cap Cover for Worx
This is a spool-and-cap kit, not a full trimmer. The listing says it is a 3 plus 1 pack, with 3 spools and 1 cap. The spools are made from copolymer nylon resin and are described as a direct replacement for the original WA0014 spool. The listing names WG168, WG184, WG190 and WG191 as compatible Worx models. The listing says the spool is designed to reduce tangling and jamming, and it describes the cap as a fit-tight cover. Those are the listing’s claims; this guide does not verify them. The package weighs 4.96 ounces according to the listing. If you own one of the named Worx models, this is the most direct fit in the pack.
2. KAKO AC14RL3A Spool for Ryobi Weed Wacker String
The KAKO listing is a larger spool pack for Ryobi trimmers. The title says 12 plus 2, and the bullets say the set includes 12 AC14RL3A spools and 2 spool caps. Each spool is pre-wound with 11 feet of line, and the listing gives a diameter of 0.065 inch. The bullets name the material as nylon and the spool body as ABS. The compatibility list is long and includes 18V model numbers such as OLT1825, OLT1830H, RLT1830H25 and RLT183213, plus RY24000 for 24V. Because the spool is sold in a 12-piece set, it suits a user who maintains more than one trimmer or who wants a spare supply. The listing says the spool is the AC14RL3A type, so check that code on your spool before ordering.
3. HEINPRO Cordless Weed Wacker for DeWalt 20V MAX
This is a tool-only cordless weed wacker. The listing states that the battery and charger are not included. The listing says it is compatible with DeWalt 20V MAX lithium-ion batteries. The bullets give a 16 inch cutting swath, a 0.08 inch line, a 6000 RPM motor, and a bump-feed head. The title says the package includes 4 bulk trimmer line coils. The listing describes the motor as brushless and says the brushless design reduces heat buildup and extends service life. That is a manufacturer statement, and this guide does not verify it. For a DeWalt 20V owner who wants a wide cutting path, this is the one listing in the set that states both a swath and a line diameter in the bullets.
4. Lemolifys Cordless Trimmer with 8 Line Spools for DeWalt 20V
The Lemolifys listing is a 3-in-1 cordless trimmer. The title says it is brushless, rated at 20000 RPM, and includes 8 line spools. The bullets say the battery and charger are not included, and that the tool is compatible with DeWalt 20V MAX batteries. The listing gives a 14 inch cutting path and describes detachable wheels that let the tool switch between a wheeled edger and a handheld trimmer. The bullets say the unit weighs just 4 pounds. The line diameter is not stated in the listing text this guide used, so do not assume a size from the spool count.
5. MtiolHig 3-in-1 Cordless Trimmer with 18 Lines for Milwaukee 18V
The MtiolHig listing is a tool-only 3-in-1 trimmer compatible with Milwaukee 18V batteries. The bullets say the battery and charger are not included. The listing says the tool includes a battery level display and a brushless motor. The bullets state a cutting width of 11 inches, and they say the package includes 18 extra 0.11 inch lines. The tool also folds down to 28 inches for storage. The listing has a conflict worth noting: one bullet gives the no-load speed as 8500 RPM, while the spec table gives 4800 RPM. The bullets also say the tool weighs 5.5 pounds, while the spec table says 6 pounds. This guide reports both figures and does not choose between them. A battery of 4Ah or larger is recommended by the listing for longer runtime, which the bullets give as 30 to 55 minutes.
6. Lacoco Cordless String Trimmer and Edger for DeWalt 20V
The Lacoco listing is a tool-only cordless string trimmer and edger. The title says the package includes 8 pieces of spool line, and the battery is not included. The listing says it works with DeWalt 18V to 21V lithium-ion batteries, and it names several DCB model numbers. The bullets give a 14 inch cutting width, a 750W motor, and 20,000 RPM. The listing describes a 180 degree handle and a cutting head that adjusts up to 60 degrees. The spec table gives a weight of 5 pounds. The bullets do not state the line diameter, so the size of the 8 spool pieces is not stated in this guide. If you need a larger cutting path with a DeWalt battery, this listing gives the widest cut of any tool in the set.
How to pick between these options
Start with your battery and head. If you already own a Worx WG trimmer, the WETOOLPLUS spool is the most direct fit. If you own a Ryobi One+ trimmer that uses the AC14RL3A spool, the KAKO set gives you 12 spools to keep on hand. If you own a DeWalt 20V battery and want a tool that comes with line coils, the HEINPRO and Lemolifys listings are the two options in the pack that state line-related components in the title. If you own a Milwaukee 18V battery, the MtiolHig listing is the only one that names Milwaukee compatibility and includes extra line in the box.
Next, decide between a spool and a complete trimmer. A spool replaces the line on a trimmer you already own. A complete tool gives you the head, the motor and the line in one package. Spool-only products cost less to keep running, but they only help if the spool matches your head exactly. Complete tools make sense when you are buying your first cordless trimmer or replacing an old one.
Mistakes to avoid
- Buying by title alone. Titles in this pack name spool counts and battery brands, but several do not state the diameter. Read the bullets and specs before you buy.
- Ignoring the battery. Most tool-only listings in this pack say the battery and charger are not included. Confirm that your battery matches the platform in the listing.
- Using a heavier line than the head allows. Check the diameter the head is rated for. Where the listing gives 0.065 inch, 0.08 inch or 0.11 inch, use that size or the one the manual names.
- Mixing up model codes. The KAKO listing and the WETOOLPLUS listing name different model codes for different spools. Match the code printed on your old spool.
- Trusting unverified claims. Listings say things like reduced heat buildup or anti-tangle design. This guide reports them as the listing’s claims only.
FAQ
What is a weed eater round trimmer line?
It is the nylon filament that a string trimmer uses to cut grass and light weeds. The word “round” describes the shape some people expect, but none of the listings in this pack state a shape, so this guide does not claim one. Choose the line by its diameter, its count and the head it fits.
What line diameter should I buy?
Use the diameter named in your trimmer manual or on the head. The pack gives several sizes: 0.065 inch for the KAKO spool, 0.08 inch for the WETOOLPLUS spool and the HEINPRO coils, and 0.11 inch for the MtiolHig lines. Where a listing does not state a diameter, the guide says so, and you should check the manual before buying.
Do I need the battery to use these products?
For the tool-only listings, yes. The HEINPRO, Lemolifys, MtiolHig and Lacoco listings all say the battery and charger are not included. The spool-only products do not use a battery, but they only fit trimmers that match the spool code.
Will a Worx spool fit a Ryobi trimmer?
No. The WETOOLPLUS listing names Worx models WG168, WG184, WG190 and WG191. The KAKO listing names Ryobi One+ AC14RL3A spools and Ryobi model numbers. Check the model code on your trimmer head before buying any spool.
Why do some listings give different numbers for the same tool?
Some product listings in this pack give a figure in the bullets and a different figure in the spec table. The MtiolHig listing is one example: the bullets give 8500 RPM and 5.5 pounds, while the spec table gives 4800 RPM and 6 pounds. This guide reports both figures instead of picking one.
How do I pick between a spool and a whole trimmer?
Buy a spool when your current trimmer works and you only need replacement line. Buy a complete trimmer when you are starting out or replacing a worn tool. The HEINPRO, Lemolifys, MtiolHig and Lacoco listings are complete tools, and the WETOOLPLUS and KAKO listings are spool sets.
Bottom line
Match the line to the head first, then to the battery. If you need replacement line for a Worx or Ryobi trimmer, use the WETOOLPLUS or KAKO spool set that names your model. If you need a DeWalt 20V or Milwaukee 18V trimmer, compare the HEINPRO, Lemolifys, Lacoco or MtiolHig listings by cutting width, line diameter and battery fit, and read the bullets for any figure the title does not give. For the related questions of line size and head type, see how to choose string trimmer line size and bump-feed vs fixed-line trimmer heads.
