If you're looking for a tough .155 trimmer line that won’t snap every few minutes, we’ve got you covered. Whether you're trimming around fences, hacking through thick weeds, or just trying to keep the yard looking sharp, the right line makes a huge difference. Some cut cleanly and last forever, while others seem to disappear before you’ve even finished the job.
We’ve actually put a bunch of these to the test—seeing how they handle real-world trimming, not just looking at specs on a package. Some held up surprisingly well, slicing through overgrown messes without breaking a sweat, while others needed constant replacing. In this guide, we’ll go over the best .155 trimmer lines that actually get the job done, so you can spend less time wrestling with your trimmer and more time enjoying a well-kept yard.
1. A ANLEOLIFE Trimmer Line
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If you're tired of flimsy trimmer lines that snap too easily, the A ANLEOLIFE Trimmer Line might be the upgrade you need. We ran this through some thick overgrowth, and it didn’t let us down. It chewed through tall grass and stubborn weeds without breaking constantly, which meant we spent less time stopping to reload and more time getting the job done.
One thing we liked right away was the bonus cutting tool included in the package. No more fumbling with dull scissors—it made cutting the line to size quick and easy. Plus, with a 3-pound spool of .155-inch-by-280-ft line, you won’t be running out anytime soon.
If you need a tough, reliable trimmer line that won’t give up mid-job, this one’s a solid choice. We’ve put it to the test, and it passed with flying colors.
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2. Arnold Maxi-Edge .155-Inch x 117-Foot Commercial Trimmer Line
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The Arnold Maxi-Edge .155 trimmer line has been a go-to for us for a while now, and it’s easy to see why. This stuff is built for tougher jobs—whether it’s thick weeds or overgrown grass, it slices through with minimal effort. We noticed right away that the six-point star shape made a big difference, creating cleaner cuts compared to standard round lines.
One small drawback is the dark red color, which can make it hard to see against certain backgrounds. But honestly, once we got used to it, it wasn’t a deal-breaker. Feeding the line through some trimmer heads took a little effort since it's thicker than standard lines, so double-check if your trimmer can handle it.
After several uses, we can confidently say this line is a winner for anyone needing something durable. It holds up well, cuts clean, and comes with a bonus cutting tool—so you get a good amount of bang for your buck.
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3. Oregon Platinum Gatorline Supertwist Trimmer Line
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This trimmer line is a beast when it comes to cutting power, and we could tell the difference right away. The twisted design reduces drag, making our trimmer run more efficiently while also keeping the noise down—always a plus when working for long stretches.
One of the standout features is the reinforced core. We pushed this line through thick weeds and dense underbrush, and it held up better than most. That said, it does have a weak spot—if you hit something solid like a rock or fence, it has a tendency to snap. Also, the auto-feed on some trimmers doesn’t seem to work as well with this type of line, so you might have to rewind it manually.
For professional landscapers or homeowners who need a powerful line, the Oregon Platinum Gatorline is a great choice. Just be mindful of hard surfaces, and you’ll get a lot of life out of it.
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4. Arnold Xtreme Professional Grade Trimmer Line
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We put this line to work on some seriously overgrown areas, and it didn’t disappoint. The serrated edges make a huge difference, tearing through thick patches of weeds without getting bogged down. We used it on a Cub Cadet walk-behind trimmer, and it held up much longer than standard lines.
One thing to keep in mind: when loading the spool, don’t cross the lines, or they’ll break more easily. Also, while Arnold advertises this as .155-inch thick, some users have mentioned it feels slightly thinner. That said, we didn’t notice any performance issues.
If you’re looking for a line that can handle frequent, heavy-duty use, this one’s a strong contender. Just be sure to install it correctly, and you’ll have fewer headaches.
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5. Oregon Magnum Gatorline Trimmer Line
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We took the Oregon Magnum Gatorline for a spin and immediately noticed how well it sliced through thick vegetation. The square shape gives it more cutting power, and the high-strength inner core means you won’t be replacing it as often.
However, make sure your trimmer is compatible with a .155-inch line—some models can’t handle the thicker diameter. Also, it’s a bit pricier than other options, but in our experience, the durability makes up for it. If you need a long-lasting, tough trimmer line, this is one we’d recommend without hesitation.
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6. Cluparis Heavy Duty Square Trimmer Line
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We ran this trimmer line through some thick brush, and it held up surprisingly well. The square design gives it extra cutting power, and we noticed right away that it tangled less than some of the round lines we’ve used in the past. The included cutting tool is a nice touch too—makes setup quick and hassle-free.
One downside is that if your trimmer only takes round string, this won’t work for you. Some users have reported that it snaps under extreme conditions, but in our experience, it handled most jobs just fine. It’s slightly heavier than some other lines, but that just means it packs more punch.
If you need something strong and reliable for tough jobs, this is a solid pick. Just double-check that your trimmer is compatible before buying.
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7. Grass Gator 20155A Trimmer Line
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This trimmer line stood out for its versatility. We tested it on both gas and electric trimmers, and it worked well across the board. The copolymer construction definitely adds to its durability, and we liked how clean the cuts were.
One issue we ran into was occasional tangling, especially during extended trimming sessions. It also might not be the best choice for super heavy-duty work, but for regular yard maintenance, it’s a reliable option.
If you need an all-around solid trimmer line that fits most trimmers, the Grass Gator 20155A is worth a look.
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8. Arnold MTD Genuine Parts .155-Inch Wheeled String Trimmer Replacement Cutting Lines
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Installing these lines was a breeze, which is always a plus. They fit a wide range of trimmer models, and once we got them up and running, they did a great job handling typical lawn trimming tasks.
However, if you're dealing with thick brush or heavy-duty work, these might not be the best option. They also don’t hold up well against hard surfaces—hitting a rock or sidewalk can cause them to snap. That said, for regular maintenance, they’re a solid, hassle-free choice.
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9. Cub Cadet 490-040-C035 Wheeled String Replacement Cutting Trimmer LINE
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We tested these on a Cub Cadet wheeled string trimmer, and they worked exactly as expected. The pre-cut design makes reloading super easy, which is a huge time-saver. They’re strong enough for general lawn care, though they might struggle against thicker vegetation.
If you own a Cub Cadet or Remington walk-behind trimmer, these are a no-brainer. Just know they’re not designed for heavy brush-cutting.
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10. Oregon .155″ Square String Trimmer Replacement Line
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This trimmer line impressed us with its clean cuts. The square shape really does help reduce fraying, and the convenient donut spool kept things neat and tangle-free.
It worked great on grass and moderate weeds, but when we took it to thicker brush, it wore down faster than expected. Also, while we liked the square design, some users might prefer round lines for certain jobs.
For standard trimming, this is a dependable and affordable choice. Just don’t expect it to last forever against tough undergrowth.
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Buying Guide
Picking the right .155 trimmer line isn’t just about grabbing the thickest one you see. Different materials, shapes, and diameters all play a role in how well it handles your trimming jobs. Here’s what to keep in mind:
Material
Trimmer lines come in different materials, each with its own strengths.
- Nylon: A solid all-rounder—flexible, durable, and good for everyday yard work.
- Co-polymer: A mix of nylon and other materials, making it tougher and better suited for heavy-duty jobs.
- Titanium: The most durable option, lasting up to four times longer than regular nylon. It’s pricier but built to last.
Shape
The shape of the trimmer line affects how efficiently it cuts.
- Round: The most common type, good for general trimming.
- Square: A bit sharper and more durable, making it great for tackling thicker weeds.
- Twisted: Designed for cutting through dense vegetation while reducing noise and vibration.
Diameter
Thicker lines last longer and cut through tougher vegetation, but they can also be heavier on your trimmer.
- .080 – Best for light-duty work.
- .095 – A great all-purpose option.
- .105 – More durable, suited for tougher jobs.
- .155 – The thickest choice, ideal for professional or heavy-duty work.
By considering these factors, you’ll get the best trimmer line for your needs without unnecessary frustration.
Frequently Asked Questions
What is the thickest trimmer line available?
The thickest commonly used trimmer line is .155 inches, designed for cutting through dense brush and thick weeds.
Which trimmer line is the strongest?
Titanium-infused or co-polymer trimmer lines tend to be the strongest, offering durability and resistance to snapping.
What thickness of trimmer line is recommended for heavy-duty use?
For serious cutting jobs, .155-inch trimmer line is the way to go. It powers through thick weeds and lasts longer.
Which brand of trimmer line do professionals prefer?
Pros often lean toward brands like Oregon, Stihl, and Husqvarna, thanks to their durability and consistent performance.
What is the best trimmer line for a walk-behind trimmer?
Most walk-behind trimmers perform best with a .155-inch line, especially for tackling overgrown areas.
What are the differences between .155 and .135 trimmer line?
The difference is in the thickness—.155 is beefier and better for tough jobs, while .135 is a bit thinner and more suited for lighter trimming tasks.
