Fitment first · Trimmer · SKU B0F42J17BW

6PC Replacement Spool 144-4108 Spooled Trimmer Line

6PC Replacement Spool 144-4108 Spooled Trimmer Line for Toro Model: 51831 51831T 51881 51834 51834T 60V 13" & 15" Electric Brushless Max String Trimmer

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Compatibility checkpoint

Verify this before you buy

Check the current listing
1 Match the machine model

Compare the model printed on your trimmer label with the fitment list below.

2 Confirm the line and spool spec

pre-wound spool

3 Check the part code

Match part B0F42J17BW or ASIN B0F42J17BW against the listing and your old part.

Equipment brandToro
ReplacesB0F42J17BW
Pack6-pack
Spool typepre-wound spool
CategoryTrimmer
ConditionNew aftermarket replacement

Overview

This pre-wound replacement spool drops directly into compatible string trimmers, eliminating the hassle of hand-winding line. Worn or empty spools leave trimmer owners without a cutting edge mid-job. Keeping spare aftermarket spools on hand ensures minimal downtime and consistent line feed during yard work.

Key specifications

  • Pre-wound replacement trimmer spool
  • 6-pack quantity
  • Direct-fit for listed trimmer models
  • Bump-feed compatible winding pattern

Compatibility

This spool is designed for Toro string trimmers as listed above. Confirm the spool part number, line diameter, and trimmer model before ordering to ensure a proper fit.

Installation notes

Power off the trimmer and press the tabs on the spool housing to release the cover. Pull out the empty spool and clear any debris from the housing interior. Drop in the new spool, route the line through the eyelets, and snap the cover back on.

Common questions

Q: Will this 144-4108 replacement spool fit my Toro 51834T 60V 15” brushless string trimmer, or is it only for the 13” models?

Yes, this spool is made for the Toro 144-4108 system and fits the listed 60V brushless models, including 51834T, 51834, 51831, 51831T, and 51881 in both the 13” and 15” versions. As long as your trimmer uses the 144-4108 spool style, this replacement will install correctly.

Q: How do I install one of these spooled trimmer lines on a Toro 51831 without the line tangling or feeding wrong?

Remove the battery first, then open the trimmer head and take out the old spool and any debris wrapped around the shaft. Drop the new spool in with the line oriented the same way as the original, feed the line ends through the eyelets if required, and make sure the spool turns freely before snapping the cap back on.

Q: Are these 6 replacement spools pre-wound, and do I need to do anything to maintain them for my Toro 51881?

Yes, these are pre-wound replacement spools, so you do not need to hand-wind line before installation. For best performance, keep the trimmer head clean, replace the spool when the line gets too short to advance properly, and avoid storing the spools in excessive heat so the line does not become brittle.

Before you buy — how to verify fitment

  1. Find your trimmer model number. It's usually on a label on the motor housing, battery slot, or lower shaft.
  2. Check spool compatibility. Compare the model number with the compatibility list above.
  3. Verify line gauge. Confirm the line thickness matches what your trimmer head requires by checking your manual or the old spool.
  4. Inspect the spool housing. Make sure the spool diameter, cap, spring post, and feed style match your trimmer head.

Frequently asked questions

How do I know this spool fits my trimmer?

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.

Can I rewind a pre-wound spool?

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.

How often should I replace the spool?

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.

What gauge trimmer line should I use?

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.

Where to buy

This part is available through Amazon with free returns on most orders. Use the fitment details above to compare your model, old part number, and physical specs before ordering.

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