10 Best String Trimmer Replacement Heads – Reviews & Buying Guide

Best String Trimmer Replacement Head

String trimmers are one of the most useful tools to have around for lawn maintenance. But, like any other tool, they require regular maintenance, and one of the things that will almost be inevitable at some point is replacing the trimmer head.

And to keep your weed whacker in great working condition, you need to make sure that you get the best string trimmer replacement head as there are numerous options in the market.

A good replacement head will not only ensure fast and efficient cutting but will also last long to save you cash in the long run.

When it comes to picking a replacement head for your trimmer, you will need to take into account several things from the type to compatibility and durability.

To help make shopping for one easy, below we provide top 10 string trimmer replacement head reviews and also explain the factors to consider in more detail on our comprehensive buying guide.

10 Best String Trimmer Replacement Heads - Reviews

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​PRODUCT

​FEATURES

Husqvarna 966674401 T25

1. Husqvarna 966674401 T25

  • Easy reload spool
  • Split spool design
  • Easy-to-use bump mechanism
  • Holds different gauge trimmer lines
Echo 99944200907

2. Echo 99944200907

  • Universal compatibility
  • Fits both curved and straight trimmers
  • Easy installation and new line winding
Better Heads LLC 3317233

3. Better Heads LLC 3317233

  • Universal compatibility
  • Easy installation and line reload
  • Unique pivoting design for less line breakage
Tanaka 32308

4. Tanaka 32308

  • Fits 95% of straight shaft trimmers
  • Quick line loading
  • Adapters included for different trimmers
  • Fast and simple head installation
Echo 78890-21001E

5. Echo 78890-21001E

  • Universal straight shaft trimmer compatibility
  • Holds up to 20 feet of line
  • Fast under 30 seconds reload
Husqvarna 537388101 T35

6. Husqvarna 537388101 T35

  • Wide straight shaft trimmer compatibility
  • Fast line feeding
  • Includes adapter for different trimmers
  • Spool split design
Weed Warrior 16741B

7. Weed Warrior 16741B

  • Compatible with 99% of curved and straight trimmers
  • More efficient 4 lines cutting
  • Great for both grass trimming and edging
Oregon 55-265

8. Oregon 55-265

  • Easy load in under 30 seconds
  • Great for medium to heavy-duty tasks
  • Longer line life
  • Reduced vibration when cutting
Grass Gator 5600

9. Grass Gator 5600

  • 99% gas trimmers compatibility
  • Includes 4 cutting lines
  • Quick and easy to install
  • Relatively more affordable
Grass Gator 8010

10. Grass Gator 8010

  • Fits most gas weed trimmers
  • Efficient 4-line cutting system
  • Uses more durable heavy-gauge lines

PRODUCT

1. Husqvarna 966674401 T25

Husqvarna 966674401 T25
  • Easy reload spool
  • Split spool design
  • Easy-to-use bump mechanism
  • Holds different gauge trimmer lines

2. Echo 99944200907

Echo 99944200907
  • Universal compatibility
  • Fits both curved and straight trimmers
  • Easy installation and new line winding

3. Better Heads LLC 3317233

Better Heads LLC 3317233
  • Universal compatibility
  • Easy installation and line reload
  • Unique pivoting design for less line breakage

4. Tanaka 32308

Tanaka 32308
  • Fits 95% of straight shaft trimmers
  • Quick line loading
  • Adapters included for different trimmers
  • Fast and simple head installation

5. Echo 78890-21001E

Echo 78890-21001E
  • Universal straight shaft trimmer compatibility
  • Holds up to 20 feet of line
  • Fast under 30 seconds reload

6. Husqvarna 537388101 T35

Husqvarna 537388101 T35
  • Wide straight shaft trimmer compatibility
  • Fast line feeding
  • Includes adapter for different trimmers
  • Spool split design

7. Weed Warrior 16741B

Weed Warrior 16741B
  • Compatible with 99% of curved and straight trimmers
  • More efficient 4 lines cutting
  • Great for both grass trimming and edging

8. Oregon 55-265

Oregon 55-265
  • Easy load in under 30 seconds
  • Great for medium to heavy-duty tasks
  • Longer line life
  • Reduced vibration when cutting

9. Grass Gator 5600

Grass Gator 5600
  • 99% gas trimmers compatibility
  • Includes 4 cutting lines
  • Quick and easy to install
  • Relatively more affordable

10. Grass Gator 8010

Grass Gator 8010
  • Fits most gas weed trimmers
  • Efficient 4-line cutting system
  • Uses more durable heavy-gauge lines

1. Husqvarna 966674401 T25 – Best Overall

Editor's Rating: 4.5 out of 5 stars (4.5 / 5)

Husqvarna 966674401 T25
  • Compatibility: Husqvarna models 952711969, 965966701 and many others

With a top-rated string trimmer replacement head like the Husqvarna 966674401 on your weed whacker, taming that overgrown grass and pesky weeds will become a lot easy.

This well-built trimmer replacement head comes with an easy-to-reload spool that will come off with its end cup to ensure putting in a new spool takes little effort and time.

Installing the head is also a more straightforward affair, and with its bump mechanism, it will also not take a lot of effort to advance more line when trimming.

Husqvarna makes this replacement head to fit both curved and straight shaft trimmers, and with the split spool design, winding new line will be super easy and with no guesswork as the correct winding direction is clearly marked,

This replacement head does not seem to hold a lot of string or at least not as much as the larger factory Husqvarna trimmer heads that come with their string trimmers. However, for individuals with standard lawn sizes, it holds more than enough.

Pros:

  • Easy reload spool
  • Super easy to use bump mechanism
  • Comes pre-wound with line
  • Fits both curved and straight shaft trimmers
  • Simple line winding with no guesswork

Cons:

  • Does not hold a lot of string
  • Not very helpful instructions

2. Echo 99944200907 – Best for both Curved & Straight Trimmers

Editor's Rating: 4.4 out of 5 stars (4.4 / 5)

Echo 99944200907
  • Compatibility: Echo PAS-225, SRM-225, SRM-280, GT-2200, and many others

The universal design of the Echo 99944200907 is what gives it an edge over most others out there as it means you can use it on almost any string trimmer.

And besides the universal compatibility, it has also been built to fit both straight and curved shaft trimmers which further makes it more versatile.

This replacement head is also designed to ensure quick and simple installation as it comes with all the necessary components and adapters for different trimmer styles. Winding new line is also super easy as it has clear marking on the winding directions.

Many users will also love its solid and rugged overall construction as it will ensure that it can handle the abuse that comes with regular trimming jobs.

When you compare this Echo string trimmer replacement head with other models on our list, it is a little pricier but given its rugged construction and universal compatibility, it is worth paying a few extra bucks.

Pros:

  • Universal design for a wide variety of brands and models
  • Fits both curved and straight trimmers
  • Quick and easy installation
  • Easy new line loading
  • Well-built and rugged enough

Cons:

  • Relatively pricier
  • Poor instructions

3. Better Heads LLC 3317233 – Best Universal String Trimmer Replacement Head

Editor's Rating: 4 out of 5 stars (4 / 5)

Better Heads LLC 3317233
  • Compatibility: Universal

Nothing is more disappointing than buying a string trimmer replacement head only to find that it will not fit your trimmer. But, with a universal model like the Better Heads LLC model 3317233, this will hardly ever be the case as it can fit almost any trimmer model.

Besides the universal compatibility, other things that make this one of the best universal string trimmer replacement heads include the quick and easy installation and the fact that it allows for super easy line loading.

Many users will also appreciate the unique pivoting design as it will ensure your line lasts much longer by preventing breakage. And when you buy this head, it will also come with a premium quality pre-cut line to make it ready for immediate use.

Given that this is a one size fits all trimmer head, it might not feel very secure on some string trimmer models, but the good news is that it will hardly ever wobble in any trimmer provided you install it securely.

Pros:

  • Universal compatibility
  • Quick and easy installation
  • Super easy line load
  • Premium-quality pre-cut line included
  • Line breakage preventing design

Cons:

  • One-size fits all might not feel very secure on some trimmers
  • Lots of plastic components

4. Tanaka 32308 – Best for Straight Shaft Trimmers

Editor's Rating: 4.3 out of 5 stars (4.3 / 5)

Tanaka 32308
  • Compatibility: 95% of all trimmers

If you use a straight shaft trimmer, the Tanaka 32308 is a perfect choice for you as it has been specifically built for these trimmers and is compatible with 95% of them.

This trimmer head has also been built to ensure fast and easy installation without requiring any special tools, and line loading is also quick and almost effortless as you only need to push a button.

When you buy this replacement head, you will also get adapters for use on different string trimmer models, and it also comes with some line to make it ready to use straight from the box.

When compared to other string trimmers on our reviews, the Tanaka 32308 seems to chew through the line a little too fast, but this should not be a big deal because a simple push of a button is all it takes to load more line.

Pros:

  • Line included for immediate use
  • Quick line loading
  • Simple and fast head installation
  • Comes with adapters for different trimmers

Cons:

  • Seems to use up the line a little too quickly

5. Echo 78890-21001E – Widely Compatible & Fast Loading

Editor's Rating: 4 out of 5 stars (4 / 5)

Echo 78890-21001E
  • Compatibility: Universal

The Echo 78890-21001E is another great choice for those that use the straight shaft trimmers, and it has a universal fit that allows you to use on almost any straight shaft trimmer model.

Also, it comes with different adapters to allow you to use it on various trimmers from different brands besides Echo such a Husqvarna, Stihl, Tanaka and Redmax.

When using it, you will also love the fast line loading as it will only take 30 seconds or less, and to make things even better, no disassembly will be required.

This trimmer head will accommodate different line gauges from 0.95 to 0.130 inches and hold up to an impressive 20 feet of line to iminimize the frequency of reloads.

While this is sold as a universal trimmer replacement head, it still does not fit curved shaft trimmers which can be a disappointment for some users. But for those that have straight shaft trimmers, it will be an excellent choice.

Pros:

  • Adapters for different trimmers included
  • Fast reload with no disassembly required
  • Holds a lot of line
  • Will accommodate different line gauges

Cons:

  • Will not fit curved shaft trimmers
  • Relatively pricier

6. Husqvarna 537388101 T35 – Easy to Use & with Higher Line Capacity

Editor's Rating: 4 out of 5 stars (4 / 5)

Husqvarna 537388101 T35
  • Compatibility: Husqvarna straight shaft and others from Echo, RedMax, and Stihl

An easy to use trimmer replacement head like the Husqvarna 537388101 makes weed cutting hassle-free, and it also comes in a universal design that allows you to use it on most straight shaft trimmers.

This trimmer head will also include adapters for different trimmers to make it easy to install on your trimmer. Also, the trimmer head makes spool loading quick and easy, and it will also include a split spool design to minimize common problems like tangling and line welding.

The spool on this trimmer head also includes two key slots that are very handy in keeping the trimmer line in place and ensuring it does not unwrap when putting the cap back on your trimmer. And it will also hold up to 28-feet of trimming line and accommodate different gauge lines.

The blue bump button seems to wear out a little too fast or at least faster than many users would like, but the good news is that it still makes line feeding fast and easy. Also, it is one of the most used parts of the trimmer head, and so one can rightfully expect it to wear out fast.

Pros:

  • Fits most straight shaft trimmers
  • Package includes adapters for different trimmers
  • Easy spool reload
  • Split design spool for reducing line welding and tangling
  • Holds a lot of line

Cons:

  • Bump button wears out a little too fast
  • Could be a little cheaper

7. Weed Warrior 16741B – Excellent Value for Cash

Editor's Rating: 4 out of 5 stars (4 / 5)

Weed Warrior 16741B
  • Compatibility: 99% all gas curved and straight shaft trimmers

With a universal fit that allows it to fit up to 99% of the gas curved and straight shaft trimmers, you can almost be certain that the Weed Warrior 16741B will work for you regardless of the trimmer you own.

But besides the universal compatibility, there are many other things that make this a good string trimmer replacement head key among them being that it cuts with 4 lines for maximum efficiency.

This top-notch trimmer head is perfect for both edging and trimming, and it offers quick and simple line loads to ensure you never have to go through the frustration of dealing with line tangling.

Feeding the line is also fast and simple, and when using this trimmer head you can be confident of fewer stops when working.

Because you will need to cut the trimming lines to length to fit the trimmer head, this means extra work for you, but the lines go a long way to ensure less frequent reloads.

Pros:

  • Great for both trimming and edging
  • Fast and simple line feed
  • More efficient and fast 4-line cutting
  • Relatively more affordable

Cons:

  • Cutting line to length takes quite some effort
  • A little on the heavy side

8. Oregon 55-265 – Perfect Choice for Medium to Heavy Duty Use

Editor's Rating: 3.9 out of 5 stars (3.9 / 5)

Oregon 55-265
  • Compatibility: Most straight shaft trimmers

If you plan to do any medium to heavy-duty trimming jobs, this Oregon trimmer replacement head will come in handy, and the chances are it will even outperform the factory installed one on your trimmer.

It is designed to provide easy and fast loading that should take 30 seconds or less, and it is a semi-matic head designed to handle a variety of trimming and edging applications

And with its specially designed walls, this trimmer head will ensure no debris end up inside and ruin it, and it also included some durable eyelets to ensure a long line life.

Also, many users will love that it comes with an adapter to suit different trimmer models and that it has an effective line tensioning system and a split spool for minimal vibration.

The included assembly instructions would do with a few more diagrams and paragraphs explaining how to install the trimmer head on different trimmers, but this should not be the deal breaker as everything is still easy to figure out even with the wanting instructions.

Pros:

  • Easy under 30 seconds load
  • Split spool for minimal vibration
  • Longer line life
  • Includes adapter for different trimmers
  • Rugged construction for increased durability

Cons:

  • Assembly instructions not adequate

9. Grass Gator 5600 – Well-Built, Easy to Use & Inexpensive

Editor's Rating: 3.7 out of 5 stars (3.7 / 5)

Grass Gator 5600
  • Compatibility: 99% all gas trimmers

Grass Gator 5600 is a well-built and easy to use trimmer replacement head that is compatible with 99% of all gas trimmers out there, and it is also a more affordable model.

This inexpensive replacement head cuts with 4 lines for more efficiency and also to ensure you never have to worry about spool winding or deal with line tangling.

Also, it is super easy to install, and you will not even need to use any tools which makes it even more convenient for first-time users.

The trimmer head has been designed to be an excellent tool for both edging and trimming, and it will also come in a more lightweight design to ensure it does not add significant weight to your trimmer.

The Grass Gator 5600 seems to bog down a little when cutting thick and heavy grass given its smaller size, but the good news is that it should still be able to cut through it.

Pros:

  • More cutting lines for increased efficiency
  • Lightweight overall construction
  • Wide gas trimmer compatibility
  • Quick and easy installation
  • Relatively more affordable

Cons:

  • Bogs down a little in heavy grass
  • Not a completely universal fit

10. Grass Gator 8010 – Inexpensive but High-Quality

Editor's Rating: 3.6 out of 5 stars (3.6 / 5)

Grass Gator 8010
  • Compatibility: 99% all gas trimmers

Grass Gator makes the model 8010 string trimmer replacement head for those that use the gas weed trimmers as it will fit up to 99% of them.

It is also the cheapest model in our string trimmer replacement head reviews, and it is designed to ensure you get the best value for money by offering a long service life.

This string trimmer also uses heavy gauge line for more efficient cutting and to ensure the line lasts longer. And because it uses 4 precut lines, you will never have to worry about common spool problems like tangling.

Installing this trimmer head on your trimmer is also more straightforward, and loading the lines will also not take a lot of effort. With this trimmer head, you can also cut through the toughest grass or weeds with ease.

When you replace the line you will end up wasting quite a lot of it as you will need to replace the 4 lines at the same time. But, in reality, this string trimmer head uses less line when cutting, and so, in the end, you will still save a lot of cash.

Pros:

  • Uses long-lasting high gauge line
  • Fits most gas weed trimmers
  • Easy to install and load
  • Great for cutting both grass and weeds

Cons:

  • Wastes a lot of trimming line
  • Installation instructions could be clearer

How to Buy the Best String Trimmer Replacement Heads

How to Buy the Best String Trimmer Replacement Heads

For many homeowners, replacing their string trimmer head is often just about buying the exact model that is already on their trimmer.

However, in some instances, this is not possible as it might not be available, and some users will also prefer to upgrade to something better which means you will need to choose a new model. And to make sure you make a good choice, you need to consider the following important factors.

#1. Types of String Trimmer Heads

String trimmer heads come in different types and each will have something different to offer which makes it ideal for different kinds of situations and users.

Hence, when shopping for a replacement trimmer head, the first step should always be to decide on the type to buy. And in many instances, you will need to pick between fixed head, bump feed and automatic feed.

Fixed Head

The fixed heads are the kinds that will require you to thread in the trimming lines individually instead of inserting an entire spool.

These heads are also often heavier and larger than the two other types, and they will use a tough and highly durable string that is hard to break. The thicker lines mean that you will not have to stop trimming often to replace the line.

By threading the line manually, it is also easy to tell how much line you have when using this head, and this is one of the reasons why it is popular with professionals that want something for commercial use.

Bump Feed

Bump feed string trimmer heads are highly reliable and user-friendly and this should explain why they are one of the most popular types.

These heads use a spool and they get their name from the fact that you have to bump them for more line to advance when trimming.

But despite being more user-friendly and easy to operate, these trimmer heads tend to wear down much faster than other types, and so users have to replace them more often.

Automatic Feed

The automatic feed trimmer head is quite similar to the bump head, but it includes a motor that spins the line for automatic advancement.

With these heads, you can trim the lawn without having to stop to advance more line or keep bumping it, and this can allow you to work smoothly and finish the job faster.

But, the extra electronic components and moving parts on this trimmer head make it more prone to breaking down. And this means that despite being very convenient, automatic feed heads are not the most reliable ones.

#2. Compatibility

No matter how good a string trimmer replacement head might be, it will only work well for you if it is compatible with your particular string trimmer model.

The good news is that most manufacturers will indicate clearly the string trimmers their replacement heads are meant for. And so taking some time to read the description will ensure you end up with the right one.

However, there are also some universal string trimmer replacement heads that will work for almost any string trimmer, and so compatibility should not be a huge concern when buying one of them.

#3. Size of the Head

The size of the head also matters as it has a huge effect on the cutting width, and so it should also be one of the main factors that you consider when making up your mind.

But when it comes to the head size the best string trimmer replacement head for you will depend on how you intend to use the weed trimmer.

For those that only have small yards that have not been infested by weeds, a small head size should be good enough as it does not make sense to invest in a large and expensive one.

But, if you are dealing with thick and fast-growing grass and weed or have a large lawn to work on, the larger the head the better it will be for you.

#4. Durability

While string trimmer replacement heads might not be very expensive, you still do not want to have to buy a new one every now and then. Hence, whatever you choose should be durable enough.

When it comes to durability, you will need to consider both the materials used and the quality of the construction. For the material, most will be mostly plastic, but it is important to make sure that the manufacturer uses heavy-duty plastic.

And if you are buying an automatic feed head, it will also be important to make sure that you get something with high-quality internal components to ensure long service life.

How to Install a String Trimmer Head 

How to Install a String Trimmer Head

Finding a good string trimmer replacement head is just the first step as you will also need to figure out how to install it correctly.

But, this should also not be a tedious task because most manufacturers will also provide instructions. And even if what you buy does not come with any instructions, you can easily install it by following the simple steps below.

Step #1: Remove Spool

For most string trimmers, removing the spool is super fast and easy as you will only need to twist and pull it off. But, if what you have does not allow for this, you should follow the manufacturer's instructions.

Step #2: Remove the Old Trimmer Head

Once the spool is out, the next step is to remove what is remaining of the head.  Most string trimmers will have the head attached to the trimmer with a nut or bolt, and so you will need to use a ratchet to free it before pulling it off.

Step #3: Slide in New Head

Now you can slide in the new head to your trimmer, and you should start by installing the larger fender washer that comes with it over the threaded shaft. And once the washer is in place, you can now slide the trimmer head over it before finishing by putting in the adapter piece on the shaft and aligning it with the trimmer head.

Step #4: Fasten the Trimmer Head

The last step is to slide in the last washer over the adapter piece and then attach the retaining nut before tightening. You can now try out the string trimmer to determine whether the new head works fine.

Conclusion

A worn out string trimmer head should never stop you from keeping your yard or lawn neat and clean as you can replace it with a new one easily and without spending much.

But, just like when buying a string trimmer, you also need to make sure that you get a top-notch quality replacement head by considering important factors like the type, compatibility, head size, and durability.

And besides explaining these important factors in more detail, this piece also provides reviews of 10 top-rated models to ensure that finding the best string trimmer replacement head will now take little effort.