Overview
Designed as a plug-and-trim aftermarket replacement, this pre-wound spool fits directly into the trimmer head without any custom winding. Factory spools eventually run out, and hand-winding bulk line can be time-consuming and prone to tangles. This replacement spool provides properly wound line that feeds smoothly from the first tap.
Key specifications
- Pre-wound replacement trimmer spool
- Direct-fit for listed trimmer models
- Bump-feed compatible winding pattern
Compatibility
This spool is designed for Kobalt string trimmers as listed above. Confirm the spool part number, line diameter, and trimmer model before ordering to ensure a proper fit.
Installation notes
Disconnect the battery or unplug the trimmer. Remove the bump knob or spool cover by pressing the release tabs. Lift out the used spool, insert the new one with the line routed through the exit holes, and replace the cover. Pull the line to confirm smooth feed before starting.
Common questions
Q: Will this KST120X-06 / KST2040-06 replacement spool fit my Kobalt 40V Max KST 2040-06 and KDLA 3040-03 trimmer?
Yes, this spool is made for the Kobalt 40-Volt Max KST 2040-06 and is also compatible with the KDLA 3040-03 attachment-capable setup listed for this replacement. It also fits Kobalt KST120X-06 models that use the 0.065” line spool design, so the key thing to confirm is that your trimmer uses 0.065” line and this spool style.
Q: Does this spool come pre-wound with 0.065” line, and can I use thicker line like 0.080” in my KST120X-06?
This replacement spool is pre-wound with 20 feet of 0.065” trimmer line, which is the correct size for the compatible Kobalt models listed. I would not recommend switching to 0.080” on these spool heads, because thicker line can cause feeding problems, extra drag on the motor, and poor spool performance.
Q: What’s the correct way to install this replacement spool so it feeds properly in my Kobalt KST 2040-06?
First remove the battery, then open the trimmer head cap and take out the old spool and any debris packed inside the housing. Set the new spool in with the line routed through the eyelets, make sure the line direction matches the head’s feed path, and snap the cap back on securely; if it doesn’t feed smoothly, check that the line isn’t crossed or pinched under the spool.
