String Trimmer Replacement Head with Trimmer Line

Features

  • Pre‑wound with 0.080 in trimmer line
  • Designed for trimming and edging tasks
  • Line made from flexible, impact‑resistant materials
  • Accepts 0.080 in line; compatible with 0.095 in on select models
  • Bump‑feed replacement head for quick installation

Specifications

Product Width 3.75 in
Line Diameter 0.080 in (pre‑wound); compatible with 0.095 in on select models
Trimmer Part Type Bump feed trimmer head
Compatible Models DCST920B, DCST920P1, DCST990B, DCST990M1, DCST990H1, DCST990X1, DCST970X1 (other sources also list DCST920, DCST970, DCST990, DCST991, DCST995)
Manufacturer Warranty 3 year limited warranty; 1 year free service; 90‑day money back guarantee

Bump‑feed replacement trimmer head, supplied pre‑wound with 0.080 in line. Intended for trimming and edging with cordless trimmers; accepts 0.080 in line and is reported to be compatible with 0.095 in line on some models. Compatible with multiple DEWALT cordless trimmer models.

Model Number: DWO1DT980

DeWalt String Trimmer Replacement Head with Trimmer Line Review

3.8 out of 5

Why I tried this head

My trimming routine isn’t gentle. I work along chain‑link fence, rock borders, and a handful of raised beds that love to snag line. After too many re‑spool sessions and a worn bump knob on my older head, I swapped it for DeWalt’s bump‑feed replacement head. It ships pre‑wound with 0.080 in line and targets a range of DeWalt cordless trimmers. I wanted something that feeds consistently, is easy enough to service in the yard, and won’t crack the first time it meets a landscape brick.

What it is (and who it’s for)

This is a traditional bump‑feed head designed for trimming and edging. It comes ready to use with 0.080 in line and accepts fresh 0.080 when you re‑spool. On certain higher‑torque trimmers in DeWalt’s lineup, the head can also run 0.095 in line. If you already own a compatible DeWalt trimmer and you prefer the simplicity and control of bump‑feed over quick‑load styles, this head fits the brief.

DeWalt lists compatibility across several cordless models, including the DCST920, DCST970, and DCST990 families (and variants like DCST991 and DCST995). That makes it a logical replacement for many 20V MAX, 40V, and FLEXVOLT users. The key caveat is to verify your exact model; DeWalt uses different arbors and adapters across generations, and that determines whether the head threads on cleanly.

Installation and compatibility

Out of the box, installation took me about ten minutes, most of that spent confirming I was turning the right direction. Like most trimmer heads, this one secures with a left‑hand thread. If you’re used to “righty‑tighty,” you’ll want to pause and check the arrows on the cap before you muscle anything.

A few tips from my setup:

  • Lock the gearbox: Use the tool’s spindle lock if your trimmer has one. It keeps the head from spinning while you loosen/tighten the old and new heads.
  • Mind the direction: The head (and often the retaining nut) tightens counter‑clockwise. If it feels wrong, it probably is—back off and re‑orient.
  • Keep track of any spacers/washers: Some trimmers use a thin washer or adapter. Move those over exactly as they were.
  • Test the bump action before powering up: With the battery removed, pull a few inches of line, bump the head by hand, and make sure the ratchet clicks and releases line.

On my DCST920, the head seated without drama. I’ve also handled DeWalt heads that needed an included adapter; this package didn’t require one for my unit. If your trimmer is from a different generation or market, double‑check the parts diagram in your manual to avoid the “doesn’t fit” spiral.

In‑use performance

Once installed, the head felt balanced and didn’t add noticeable vibration. The bump action is positive—one tap on firm ground advances a predictable amount of line without overshooting. That’s key for edging where you want a uniform cut path and don’t want to waste line.

  • Trimming: Through typical lawn grass and weedy patches, the pre‑loaded 0.080 line cut cleanly and kept its length with an occasional bump. Along fences, it did what 0.080 always does: fine until you start sawing against wire. Expect to bump more often there.
  • Edging: With the guard and handle set right, this head tracks edges well. Because it doesn’t over‑feed, it’s easier to keep the cut crisp without showering yourself in plastic.
  • Tall or fibrous weeds: It will cut them, but this is where line selection matters. If your trimmer supports 0.095, switching up for tougher growth reduces fray and breakage. If not, keep a fresh 0.080 spool on hand and work in controlled passes.

The internal spool pays out smoothly and resists the annoying mid‑job “bird’s nest” that cheaper heads produce. I didn’t experience jams or cross‑wraps with firmly wound, evenly tensioned line. The cap locks firmly with a quarter‑turn and never loosened in use.

Respooling and maintenance

This isn’t a quick‑load head, so you’re winding line onto a spool rather than feeding through and cranking. That’s a tradeoff: quick‑load is faster mid‑season, while a well‑designed bump‑feed like this gives you sturdy internals and fewer moving parts.

Respooling is straightforward:

  1. Remove the cap and lift out the spool.
  2. Cut equal lengths of line for both channels (check the manual for length guidance).
  3. Follow the direction arrows and keep firm tension as you wind.
  4. Seat the line ends in the notches, drop the spool back, thread the line through the eyelets, and reinstall the cap.

A few habits help:

  • Pre‑shape the line: If your trimmer line has memory, a quick soak in warm water can relax the coils for easier winding.
  • Wind tight and even: Loose wraps invite cross‑overs and jams later.
  • Inspect the bump knob: It’s a wear part. This one’s made of robust plastic and held up well against concrete and pavers, but any head will flatten if you hammer it constantly. Hit dirt or grass, not hardscape, whenever possible.

Cleaning is minimal. Pop the cap, blow out debris, and check for melted line after heavy use in hot weather. I didn’t see heat fusing during testing, but it can happen if you run very long at high RPM with line too tight.

Line choices and runtime

The head ships with 0.080 in line, which is a sensible default for 20V string trimmers and general lawn work. It strikes a good balance between cut quality and battery life. If your trimmer model supports 0.095 in line, the head will accommodate it, and there are times it’s worth using:

  • 0.080 in: Best for frequent trimming, edging, and lighter weeds. Maximizes runtime and keeps the motor spinning fast.
  • 0.095 in (select models): Useful for dense, fibrous growth and fence lines. It resists fray and breakage but adds load. On lower‑power trimmers, expect reduced runtime and a bit more bog in heavy cuts.

The nice part is you can experiment; the head doesn’t lock you into one size as long as your trimmer model is rated for it.

Durability

The housing and bump knob feel tougher than the plastics on many budget heads. After a month of weekly use—lots of fence posts and paver edges—the cap still locks tight, the spring hasn’t lost tension, and the eyelets show minimal abrasion. The impact‑resistant material claim matches what I saw: scuffs instead of cracks. Abuse will break anything, but this head seems built to shrug off typical yard mishaps.

Value and warranty

As a replacement head, value comes down to three things: fit, feed reliability, and how long it lasts. On all three, this DeWalt unit is solid. The pre‑wound line gets you running immediately, and ongoing maintenance is simple and inexpensive. DeWalt backs it with a 3‑year limited warranty, a year of free service, and a 90‑day money‑back guarantee, which is generous for a wear‑and‑tear part and removes some adoption risk.

If you change line constantly across a large property, a quick‑load head might save a few minutes per job. For most home users and many pros who prefer the predictable feel of a bump head, this design hits the sweet spot.

Pros

  • Consistent, predictable bump‑feed with no over‑feed
  • Pre‑wound with 0.080 in line and easy to re‑spool
  • Robust housing and bump knob stand up to real‑world impacts
  • Accepts 0.095 in line on supported trimmers
  • Broad compatibility across DeWalt cordless models
  • Backed by a strong warranty

Cons

  • Not a quick‑load system; respooling takes a few extra minutes
  • Compatibility depends on your trimmer’s arbor and adapter—verify before buying
  • 0.080 in line can fray quickly along fences; heavier line requires a capable trimmer

Recommendation

I recommend this DeWalt replacement head for anyone running a compatible DeWalt cordless trimmer who wants a sturdy, reliable bump‑feed setup. It installs without fuss if you pay attention to the left‑hand threads, feeds line consistently, and holds up to the bumps and scrapes that come with real trimming and edging. If your work is heavy on chain‑link or thick weeds and your trimmer supports 0.095 in line, the head’s flexibility lets you step up in diameter for fewer breaks. The only reason to look elsewhere is if you prioritize the speed of a quick‑load re‑spool above all else or your trimmer’s arbor doesn’t match. For most users, this is a dependable, no‑nonsense upgrade over a worn factory head.



Project Ideas

Business

Precision Edging Subscription

Offer a recurring edging and detail package focused on curbs, sidewalks, tree rings, and bed lines. The bump‑feed head speeds up line replacement for tight schedules; upsell heavy‑duty weeks using 0.095 in line on compatible trimmers for post‑storm or overgrown edges.


Event Turf Graphics

Create temporary lawn logos and patterns for weddings, backyard parties, schools, and corporate events using stencils and careful height control. Provide mockups, rapid on‑site install, and next‑day touch‑ups; market to venues and event planners.


Realtor Curb‑Ready Blitz

Same‑day yard detailing for real estate listings: sharp edging, fence‑line cleanup, and walkway definition, with quick before/after photos for listings. Flat-rate pricing per lot size; partner with realtors and property photographers for steady referrals.


HOA/Common‑Area Detail Routes

Micro‑routes for trimming where mowers can’t reach: mailbox clusters, playground borders, fence lines, retention ponds, and sign beds. Sell monthly contracts to HOAs and property managers; the pre‑wound head minimizes downtime between stops.


Cemetery and Memorial Care

Specialize in careful trimming around headstones, benches, and monuments where precision matters. Offer seasonal packages and photo verification for out‑of‑town families; use flexible line to reduce risk of chipping and maintain respectful, clean edges.

Creative

Lawn Labyrinth

Lay out a simple spiral or classic labyrinth with stakes and string, then use the bump‑feed trimmer head to cut a narrow path at a lower height through taller grass. The contrast between the trimmed path and the higher turf creates a walkable, meditative design that can be refreshed in minutes thanks to quick line feeds.


Garden Bed Shape Art

Edge bold shapes (leaf silhouettes, waves, stars) around existing beds, then trim and define the outline crisply with the trimmer head. Remove the interior sod and fill with mulch or groundcover for lasting living art that’s easy to maintain with 0.080 in line.


Topiary‑Style Groundcover Borders

Shape low groundcovers like liriope, creeping thyme, or mondo grass into clean, repeating patterns along walkways. The flexible, impact‑resistant line makes it easier to sculpt gentle curves and consistent radii without damaging edging stones.


Meadow Ribbon Paths

In a wildflower or tall‑grass patch, trim winding, 12–24 inch “ribbons” to create inviting paths and visual waves. Use the bump‑feed to keep line length ideal as you move through dense growth; switch to 0.095 in line on compatible models for tougher stalks.


Seasonal Turf Stencils

Place large stencils on the lawn and trim the exposed grass slightly shorter to make temporary motifs (holiday icons, initials, sports numbers). The design fades as the grass grows, letting you update for each season with a quick pass.