Fitment first · Trimmer · SKU B0F6MMZWQG
KST120X-06 KST2040-06 Replacement Spool for Kobalt 40-Volt Max KST 2040-06 KDLA 3040-03 String Trimmer, Replacement Line Trimmer Spool for Kobalt KST 120x-06…
Compatibility checkpoint
Compare the model printed on your trimmer label with the fitment list below.
.065"
Match SKU B0F6MMZWQG or ASIN B0F6MMZWQG against the listing and your old part.
Kobalt 40-Volt Max KST 2040-06 KDLA 3040-03 String TrimmerReplacement Line Trimmer SpoolKobalt KST 120x-060.065"20FT From our Amazon listing, checked September 25, 2026. Model and part-number matches are the seller's; confirm against the part on your machine.
This page lists compatible equipment gathered from the product fitment data. Always confirm the model number stamped on your machine before ordering.
Not sure which spool you need? See our guide: How to wind a trimmer spool or How to measure your old spool.
Check your trimmer model number against the compatibility list above. Then verify the line gauge (.065, .080, .095) matches what your trimmer head requires — it's usually printed on the spool cap or in the manual.
Yes. Once the factory line runs out, you can rewind the spool with bulk trimmer line of the same gauge. Pre-wound spools just save time on the first load.
Replace the spool when the line no longer feeds properly, the spring loses tension, or the spool body is cracked. Under normal weekend use, a spool lasts 2–4 refills before the housing wears out.
Match the gauge to your trimmer's power: .065" for light-duty electric trimmers, .080" for mid-range cordless, and .095" for gas-powered or heavy-duty models. Using too thick a line can stall the motor.
This part is sold and shipped through Amazon; return options are shown on the listing. Use the fitment details above to compare your model, old part number, and physical specs before ordering.
Affiliate disclosure: we may earn a commission when you purchase through this link, at no extra cost to you.
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