Greenworks 0.065 Single Line Auto-Feed String Trimmer Spool

The Verdict

Let’s be straight: trimmer line is a consumable, and most of us just grab whatever’s cheap at the hardware store. The Greenworks 0.065" Single Line Auto-Feed Spool 6-pack asks you to pay a little more for the convenience of pre-wound spools that actually fit your machine. Is it worth it? After digging through 215 ratings (4.3 stars) and the spec sheet, here’s the real story.

What you’re actually getting

Six spools, each pre-wound with 0.065-inch single line. That’s the sweet spot for residential trimmers — thick enough to handle overgrown grass and light weeds, thin enough that it won’t strain a battery-powered motor. The auto-feed design means you don’t have to bump the head on the ground every 30 seconds; the line advances as needed when you throttle up.

Each spool is a drop-in replacement for Greenworks trimmers that use the auto-feed head system. You’re not winding line, not fighting with tension, not guessing how much to thread through. Pop the old one out, click the new one in, and you’re done in under a minute.

Performance in the real world

The 0.065" line holds up reasonably well against normal yard debris. It’ll slice through fescue, crabgrass, and dandelions without issue. But here’s the honest tradeoff: this is not brush-cutting line. If you’re tackling blackberry thickets or saplings, you’ll eat through these spools fast and wish you’d bought the 0.080" or 0.095" option. One reviewer put it plainly: “Works great for regular grass, but I had to switch to heavier line for the weeds along my fence line.”

What buyers consistently praise is the auto-feed reliability. A common complaint with cheaper spools is that the line jams or won’t advance, leaving you to manually pull it out. That’s not the case here. Multiple reviewers note it feeds smoothly and consistently, with one stating, “This is the first spool that actually feeds without me having to hit it on the ground every few minutes.”

Where it falls short

The biggest issue shoppers report is compatibility confusion. These spools fit specific Greenworks models — not all of them. If you have an older trimmer with a different head design, these won’t work. Check your model number before ordering. There’s nothing more frustrating than a six-pack of spools that don’t fit.

Also, the line is decent but not premium. It’s not twisted or serrated, so it’s not the best choice if you’re dealing with really tough vegetation. And while six spools sounds like a lot, a heavy trimming session can burn through one per week during peak growing season.

Who should buy this

If you own a compatible Greenworks trimmer and want a set-and-forget solution for the season, this is a solid buy. It’s ideal for homeowners with standard lawn maintenance — mowing edges, cleaning up around trees and fences, tidying walkways. You’ll appreciate the convenience of pre-wound spools and the reliable feeding mechanism.

If you have a huge property with heavy weed pressure, or you’re using a trimmer for commercial work, look elsewhere. You need heavier line and bulk spools you can wind yourself.

FAQ

Q: Will these fit my Greenworks 40V trimmer? A: Only if your model uses the auto-feed head with the same spool design. Check your trimmer’s manual or the compatibility list on the product page. Many 40V and 60V models work, but not all.

Q: How long does one spool last? A: For a typical quarter-acre lot with weekly trimming, expect 2-4 weeks per spool depending on how much edging you do. A six-pack should cover most of the season.

Q: Can I rewind these spools with heavier line? A: Yes, but it’s not recommended. The auto-feed mechanism is calibrated for 0.065" line. Heavier line may jam or not feed properly.

The Verdict

Buy it if: You own a compatible Greenworks trimmer and want hassle-free, pre-wound spools that feed reliably all season.

Skip it if: You need heavy-duty line for tough vegetation, or you’re not sure your trimmer is compatible.

Rating: 4.2/5 — A solid, convenient option for standard trimming duties. Just verify compatibility first and manage your expectations on the line’s thickness.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.