SKU: 31247010046

128LD T25 Trimmer Head - Fits Husqvarna 124L, 125L, 128L, 128LD - Replaces 966674401

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Description

128LD T25 Trimmer Head - Fits Husqvarna 124L, 125L, 128L, 128LD - Replaces 966674401128LD Trimmer Head T25 Key Features High Efficiency Tap 'N Go Feed: Specifically designed for entry level and mid range trimmers, the T25 head provides reliable line advancement with a simple tap on the ground, allowing for continuous operation without stopping. Easy Reload Open Eyelets: Features a simplified spool design with open eyelets that make reloading trimmer line faster and less prone to tangling compared to traditional closed loop heads.

128LD Trimmer Head T25

Key Features

  • High-Efficiency Tap 'N Go Feed: Specifically designed for entry-level and mid-range trimmers, the T25 head provides reliable line advancement with a simple tap on the ground, allowing for continuous operation without stopping.
  • Easy-Reload Open Eyelets: Features a simplified spool design with open eyelets that make reloading trimmer line faster and less prone to tangling compared to traditional closed-loop heads.
  • Reinforced Blue Bump Knob: The signature blue knob is manufactured from high-density, wear-resistant polymer to ensure a long lifespan even when used on abrasive surfaces like gravel or dry soil.
  • Optimized Centrifugal Balance: Engineered to reduce vibration and shaft wobble, which protects the trimmer's flexible drive cable and reduces user fatigue during extended yard work.
  • Pre-Wound Performance Line: Usually comes pre-loaded with premium 0.080" or 0.095" diameter line, offering an aggressive cut and high durability for residential trimming and edging.

Replaces / Cross-Reference Part Numbers

  • 966674401
  • 537338306
  • 537338310
  • 5373383-02
  • 578446101

Compatibility & Fitment

This "T25" head is the standard replacement for Husqvarna's lightweight and consumer-grade straight-shaft trimmers. Key compatible models include:

  • Husqvarna 120 Series: 122L, 124L, 125L, 125C, 125LDX, 128L, 128LD, 128LDX, 128R, 128RJ, 129L, 129LD.
  • Husqvarna 200 & 300 Series: 223L, 223R, 322C, 323C, 325C, 325CX.
  • Technical Specification: Fits models utilizing an M10 x 1.25 LHF (Left Hand Female) arbor thread.
  • Note: While designed for straight-shaft trimmers, it is also compatible with specific Husqvarna curved-shaft models that use the M10 thread.

When to Replace

  • Worn-Through Bump Surface: The blue center knob has ground down from pavement contact to the point where the internal spring is visible or the line no longer advances.
  • Cracked Outer Housing: Visible fractures or chips in the black plastic shell, which can lead to the head shattering at high RPMs.
  • Line Overlapping/Welding: The internal spool or divider is damaged, causing the line to melt together or jam inside the head during use.
  • Eyelet Failure: The metal line exits (eyelets) are missing or have developed deep grooves, causing the trimmer line to snap off inside the head repeatedly.
  • Excessive Vibration: The head is no longer balanced due to uneven wear, putting undue stress on the gear head and the trimmer's motor.

Installation Tips

  • Left-Hand Threads: This head is Left-Hand Threaded. To tighten it onto the trimmer, you must turn the head Counter-Clockwise.
  • Lock the Shaft: Insert a small hex key or the factory locking pin into the gear head hole to hold the shaft stationary while you spin the old head off and the new one on.
  • Spool Direction: When reloading line, follow the arrows molded into the internal spool. Winding the line in the wrong direction will prevent the Tap 'N Go mechanism from functioning.
  • Soak Your Line: To extend the life of your trimmer line, soak the spool in water for 24 hours. This keeps the nylon flexible and much more resistant to snapping at the eyelet.
  • Clean the Housing: Every time you reload the line, shake out any dirt or grass trapped inside the head to ensure the internal spring and spool move freely.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 31247010046

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4.4 ★★★★★
Based on 20 reviews
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Product Reviews
R
Verified Purchase
Ron R
Lake Worth, US
★★★★★ 5
Outstand Product!! 😉
Color: 14AWG-1 Lead
This is my second (at least) Nilight wiring harness. I wanted to re-do the lights on my Rhino 660. This makes it SO EASY! 👍🏼😉 And a hell-of-a-deal!! All I had to get was a "reamer" drill bit to enlarge the switch holes on my dash. Run the wire, attach the ends to the light, switch & power source, all done. I did add "shrink tubing" to my connections to add an extra layer of insulation/weatherproofing. 👍🏼
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 16, 2025
D
Verified Purchase
Daniel T.
Fort Morgan, US
★★★★★ 5
Definitely a good buy very professional craftsmanship
Color: 14AWG-1 Lead
As a retired master technician for Honda and all makes and models of automobiles this harness is a cut above the others is put together immaculately and anyone that can put a wire through the firewall I purchased my light bar to harbor freight 22 in great lighting but their harness kit was 56 bucks I paid under 24 this and it looked identical except the switch on this is actually much more appealing cosmetically and works well functionally just had to drill a hole in one of the blanks 4 switches in my truck made it fit perfect and has worked flawlessly since I put it in a couple weeks agodefinitely do your homework sometimes I find great deals at harbor freight that nobody can touch on Amazon but then other times vice versa Amazon has a great product at a great price compared to harbor freight in other retailers
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 22, 2020
F
Verified Purchase
FrugalDad
Pawtucket, US
★★★★★ 5
Perfect for roof LED light bar
Color: 14AWG-1 Lead
This worked great for wiring a 50" LED light bar to the roof of my SUV. This kit conveniently includes a relay, switch with backlight, and fuses. I used a step bit to drill the pilot hole for the switch and worked my way up until it was the right size. I zip tied the excess wire and it made for a clean install. My only complaint is that the ring terminals were too large for the battery but it was easy to crimp smaller ones on.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 13, 2022
T
Verified Purchase
Trevor C.
Boise, US
★★★★★ 4
Good harness
Color: 14AWG-1 Lead, Color: 14AWG-1 Lead
I bought this for the nilight 12in bar. It came in the same box and right on time. It easily connected to the light bar and into the engine. There is a lot of slack between the battery terminals and the bar, but it’s understandable if maybe you wanted to mount this on the back of your vehicle. I wish there was more slack between the relay and the switch, as having to go from the battery through the firewall and into the cabin requires sufficient length. I ended up getting rid of the circular switch that came with it and it’s complimentary connectors to replace it with my own rectangular rocket switch that fit better in the cabin. Overall good product. I’d advise to wrap electrical tape around the quick disconnect to prevent any weather wear.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 19, 2020
G
Verified Purchase
Glock30sf
New York, US
★★★★★ 5
Good
Color: 14AWG-1 Lead
I have used nilight products for years now and they are good for the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 12, 2025

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