Best Weed Eater String Replacement Options Compared
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Weed eater string replacement comes down to three things: the line diameter your trimmer’s head accepts, the length of line on each spool, and whether the spool feeds automatically. Most replacement spools in this roundup are 0.065-inch nylon line sold as a pack of spools, and the main differences are how much line each pack holds and which brand’s trimmers the listing names. The eight options below are the spool and line products from our product data that match this search, and each section gives only the facts that the listing itself states about that product, along with a reason it may fit a particular trimmer.
Quick answer
- Match the line diameter to your trimmer first. Most listings here are 0.065 inch, and the 0.080 inch option is for trimmers that call for that size.
- For the most line per pack, the listings give the largest totals as 360 feet across 12 spools, 240 feet across 10 spools, and 200 feet of line for a single long spool on other products.
- Choose a spool that names your trimmer’s brand or model in its compatibility bullets, and confirm the model number on your own machine before ordering.
- If your head is a bump-feed or auto-feed type, pick a spool built for automatic feeding, which several listings state directly.
How to choose the right replacement spool
A replacement spool has to do two jobs. It has to carry the right line, and it has to fit the spool cavity in your trimmer head. The diameter of the line is printed on most spools and listed in the product title, so start there. Line that is too thick will not feed, and line that is too thin will wear out quickly and can break against tougher weeds. Once the diameter matches, check the spool shape. Auto-feed spools are built to release line by centrifugal force, and the listings in this group describe that feature in their bullets.
Next, look at the compatibility wording. Several listings name a specific brand and a list of model numbers, while others say the spool is compatible with a broad group of trimmers. Brand-specific model lists are the most reliable guide, because a spool that fits one family of heads may not seat in another. If a listing says only “universal” or gives no model list, check your trimmer’s manual before you buy.
Finally, consider how much line you need. A small pack with one or two spools is enough for a light yard. A larger pack lasts longer and avoids a trip to the store in the middle of a job. The line length in the listing is the most direct measure, but read the pack contents too, because some titles and bullets describe the pack differently.
Comparison table
The table lists only the values each listing states. Where a listing does not state a value, the cell says “not stated” so you can see the gap.
| Product | Line diameter (as stated) | Length or pack (as stated) | Compatibility wording |
|---|---|---|---|
| GOSDENG Ryobi One+ string, 10 pack | 0.080 inch | 11 ft per spool, 10 cordless spools | Ryobi One+ AC80RL3 and related models |
| BLACK+DECKER OEM 3-pack spools | 0.065 inch | 30 ft in the title, 3 spools | Named BLACK+DECKER models |
| BLACK+DECKER AF-100 autofeed spool | 0.065 inch | 30 ft | Named BLACK+DECKER models |
| CRAFTSMAN OEM 3-pack | 0.065 inch | 30 ft in the title, 3 spools | Named CRAFTSMAN models |
| Eventronic AF-100 string, 10 pack | 0.065 inch | 240 ft in the title, 8 spools in bullets | Named BLACK+DECKER models |
| Eventronic Ryobi string, 6 pack | 0.065 inch | 66 ft in the title, 6 spools in bullets | Named Ryobi models |
| Worx WA0010 spool, 15 pack | 0.065 inch | not stated | Named Worx models |
| Eventronic AF-100 string, 12 spool | not stated | 360 ft in the title, 12 spools in bullets | Named BLACK+DECKER models |
Product reviews
The sections below go through each product in the order of the table. Each one names the facts the listing states and explains the kind of trimmer or situation it fits. Where the listing gives conflicting numbers, the conflict is noted rather than resolved.
1. GOSDENG Ryobi One+ string, 0.080 inch, 10 cordless spools
This pack is built for the Ryobi One+ cordless family. The title gives the line as 0.080 inch and 11 feet per spool, and the bullets state that the package contains 10 cordless spools. The listing names Ryobi One+ AC80RL3 and several other models as compatible, and it describes an auto feed system that replaces the hand winding of a spool. The line is described as an upgraded nylon, and the spool as ABS. The listing gives the item weight as 12.3 ounces and does not state a runtime or speed. Choose this pack if your Ryobi trimmer uses a 0.080 inch line and you want a set of spare spools on hand. Confirm the model on your trimmer before ordering, because the listing’s compatibility list is the only guide it offers.
2. BLACK+DECKER OEM string, 3 spools of 0.065 inch
This listing is a three-pack of genuine BLACK+DECKER spools with a 0.065-inch diameter line. The bullets say the replacement spool system uses centrifugal force to feed line as needed, and that the spools are factory wound. The listing gives a long compatibility list of BLACK+DECKER models, including BESTA51, BESTA512, GH4 and LST12, and it names a two-year limited warranty. Because it is an original-equipment spool, it is a good fit for a BLACK+DECKER owner who wants the factory feed behavior and does not want to check a generic spool’s fit. The listing describes the product as “Compatible with most BLACK+DECKER string trimmers,” so a model check is still worthwhile.
3. BLACK+DECKER AF-100 autofeed spool, 0.065 inch, 30 feet
This is a single BLACK+DECKER AF-100 spool with 30 feet of 0.065-inch line. The listing says the line is factory wound for a superior feed, that the auto feed system eliminates hand winding, and that the spool includes a 0.065-inch line. The compatibility bullet lists BESTA510, BESTA512, BEASE620, CST1000, GH400 and several other BLACK+DECKER models. It is a practical choice for a single replacement when you do not need a multi-pack. Its strength is that the listing names the feed system and the model range clearly, and its main limit is that it contains only one spool, so buyers who restring often may prefer one of the larger packs.
4. CRAFTSMAN OEM string trimmer line, three-pack of 0.065 inch
This is a three-pack of CRAFTSMAN spools at 0.065 inch, with the title giving 30 feet of replacement line. The bullets say the spools are factory wound for a smooth and reliable feed and describe the product as made for string trimmers. The compatibility bullet names the CMCST900, CMESTA900, CMESTE920 and CMCST98020 series. The listing states a two-year limited warranty. Choose this pack if you own a CRAFTSMAN WEEDWACKER from the named series and want a spare set on hand. The bullets do not describe how the line behaves on other brands’ heads, so the model list is the deciding check.
5. Eventronic AF-100 string, 0.065 inch, 10-pack
This pack of 10 Eventronic spools is built for BLACK+DECKER trimmers that use the AF-100 family of spools. The title gives 0.065 inch and 240 feet, but the bullets say the package contains eight replacement spools, so the listing gives two different counts and the buyer should read the product page before buying. The bullets describe an automatic feed spool that feeds by centrifugal force, a nylon polyamide line built to resist abrasion, and a model list that includes GH400, GH500, GH600 and ST6600. The listing names the seller as a professional brand and mentions an after-sales team, but it does not give a separate warranty period. This is a good fit for a BLACK+DECKER owner who wants a large multi-pack at a 0.065-inch diameter.
6. Eventronic Ryobi string, 0.065 inch, 6-pack with spool cap
This pack is built for Ryobi ONE+ cordless trimmers. The title gives 0.065 inch and 66 feet, and the bullets say the package contains six Ryobi strings and one spool cap. The listing names Ryobi ONE+ models including 18V and 24V versions and lists the AC14RL3A spool as a compatible reference. The bullets describe the same automatic feed design, the same nylon polyamide material, and the same tensile strength claim used in the other Eventronic listings, so buyers should read the compatibility list for their exact model. The spool cap included with the pack is a useful spare if your original cap is cracked or lost. The listing does not give a runtime or a warranty length.
7. Worx WA0010 spool line, 0.065 inch, 15-pack
This 15-pack is listed for a long set of Worx trimmer models, including WG122, WG150, WG151, WG152, WG153, WG155 and WG160, and the listing gives a compatibility range that is wider than many of the other packs here. The bullets describe 0.065-inch polyamide nylon thread, a twisted design that the listing says reduces noise and vibration, and an aerodynamic shape meant to reduce drag. The listing does not state a length per spool, so the total line amount is not stated. A buyer with a Worx trimmer from one of the listed models can use the wide model list to check fit. Buyers with other brands should not rely on this pack, because the listing names only Worx models.
8. Eventronic AF-100 string, 360 feet, 12 spools
This is the largest pack in the roundup by stated length. The title gives 360 feet of 0.065-inch line, and the bullets say the package contains 12 replacement spools. It uses the same AF-100 compatibility list as the 240-foot Eventronic pack, including GH400, GH500, GH600, GH610 and ST6600 models, and it describes the same automatic feed spool with centrifugal feeding. The listing does not state the diameter in its bullets, although the title does, and it gives no separate warranty length. This pack suits a buyer who restrings a heavy-use BLACK+DECKER trimmer often and wants the lowest number of trips to buy line. Check that the diameter in the title matches your trimmer before you commit to 12 spools.
How to pick between the packs
The packs fall into three groups. The first is original-equipment or brand-named spools, which carry the brand’s own model list and, in the case of BLACK+DECKER and CRAFTSMAN, a warranty statement in the listing. These suit owners who want the least guesswork. The second group is third-party multi-packs, which usually give more spools and more line in one order, but which need a careful check of the model list. The third group is the single-spool option, which is useful when you only need one replacement and do not want to store a larger set.
Within the brand-named group, the important decision is which model family your trimmer belongs to. The BLACK+DECKER listings use AF-100 and related model numbers, the CRAFTSMAN listing uses the CMCST and CMESTA series, and the Ryobi and Worx listings name their own model families. If you cannot find your model number on the listing, do not guess. Look at your trimmer’s label or manual, which will give the model number that matches the spool you need.
For third-party packs, read the title and the bullets together. Some listings describe a line length in the title that differs from the number of spools in the bullets. The listing states both, so the product page is the best place to confirm which count applies to the pack you are about to order. Where a listing gives no length or count, the only way to compare is to check the pack contents on the product page.
Common mistakes when replacing string
The most common mistake is buying a line diameter that does not match the head. Most listings here state 0.065 inch, and a few state 0.080 inch, so check your trimmer’s manual or the old spool before you order. A second mistake is buying a generic pack without checking the model list, which can leave you with a spool that does not seat in the head. A third is winding a spool against the direction the arrows show, which prevents the line from feeding. If you are unsure how to wind a new spool, read our step guide on cutting tall weeds with a string trimmer for general technique, and then follow your model’s manual for the winding direction.
Another mistake is leaving the head damaged. A cracked spool cap or a worn eyelet will keep line from feeding no matter how carefully you wind the replacement. Inspect the head each time you restring it, and replace any part that will not hold the spool firmly.
FAQ
What line diameter do most of these spools use?
Most of the listings in this roundup state 0.065 inch. The GOSDENG Ryobi pack is listed at 0.080 inch, and the other products state their diameter in the title or bullets. Confirm the diameter on your own trimmer’s head or in its manual before ordering, since the diameter is the single most important fit check.
Which pack gives the most line?
By stated length, the Eventronic AF-100 listing with 360 feet across 12 spools gives the most line. The 240-foot Eventronic listing gives the next highest total in its title, although its bullets describe eight spools, so the count should be checked on the product page. The Ryobi Eventronic listing gives 66 feet across six strings.
Are these spools universal?
Not all of them. Most listings name specific brands or model families, and the compatibility list is the most reliable guide. A few listings describe a wider range, but the safest approach is to match the model number on your trimmer to the list in the listing.
What does auto feed mean on a spool?
An auto-feed spool releases a short length of line as the head spins, so you do not have to stop and pull line by hand. Several listings in this roundup describe the feature in their bullets, including the BLACK+DECKER AF-100 spool and the Eventronic packs. The listings say the feed works by centrifugal force.
Do these listings state a warranty?
Some do. The BLACK+DECKER three-pack lists a two-year limited warranty, and the CRAFTSMAN three-pack lists a two-year limited warranty. Most of the third-party listings do not state a warranty length, so check the product page if warranty coverage matters to you.
Can I use the spool cap that comes with a pack?
The Ryobi Eventronic pack includes one spool cap, and the Worx pack names a fit for its own cap model. Confirm that the cap matches your trimmer head before you swap it, because a cap that does not seat will let the spool come loose during use.
Bottom line
For weed eater string replacement, start with the line diameter and the model list for your trimmer. If you own a BLACK+DECKER, CRAFTSMAN, Ryobi, or Worx trimmer, choose a pack that names your model family, and use the stated length to decide how many spools you need. Keep one spare spool on hand so a job is not interrupted. For background on choosing a trimmer that suits your yard, see our guide to battery lawn mowers compared.
