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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4.0 ★★★★★
Based on 17 reviews
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IrishPuterGeek
New York, US
★★★★★ 4
Fantastic suite for the price!
Size: Large, Color: Khaki
I purchased the gray version to evaluate the suit. I ordered a size up based on other reviews and was pleased to discover everything fit well. The jacket fit well around the arms, chest, shoulders, and even my seemingly ever-growing gut. The vest was the same. The pants also fit well around the waist (thanks to the expanding waistband) butt, and thighs. The only problem was the pants were about 2 sizes too long. Considering the price point, I was felt I was still way ahead after paying to have them altered. After a couple week's worth of wear, I purchased 4 more (gray, black, blue and tan). All fit the same way and were easily altered too. The tailor even had the cashier ask me where I purchased these as he was impressed with the quality. A couple months in and I'm still pleased, although I've had a few issues. My right pocket on my blue pair has ripped it's seam twice, as has the same pocket on one of my gray pair. Considering it's the same pocket, I would suspect I am just heavy handed but this is not a common problem with any of my other clothes. The pants are a bit on the tighter side when I am sitting down so perhaps the stitching is just not strong enough. I have asked the tailor to give me a super stitch in this area and am just about to pick up the gray pair with this new stitch. I'll try to remember to update later on. Overall, I feel I have really gotten my money's worth out of these suits, especially considering the prices of others. I have been wearing these daily since June and have gotten many compliments.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 3, 2024
C
Verified Purchase
CC Moon
Massapequa, US
★★★★★ 5
Happy teen for prom. 6'1" 170 lbs medium perfect fit
Size: Medium, Color: Black, Size: Medium, Color: Black
This ended up being a great purchase. My son chose this suit for prom. He made sure to check the reviews and size chart and was very happy with the fit, quality and overall look. He's 6'1", 170 lbs and got a medium. It was perfect.
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Reviewed in the United States on May 10, 2026
D
Verified Purchase
didibling
Belleville, US
★★★★★ 5
Great suit at a great value
Size: Large, Color: Black
I have ordered several other suits from the seller for my three boys over the last several years for either their prom, special events and graduations. The fit and value are wonderful. I would definitely recommend this suit if you want something that is classy looking, but won’t break the bank
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Reviewed in the United States on April 8, 2026
A
Verified Purchase
Amanda Sammon
Houston, US
★★★★★ 5
Great Suit
Size: Small, Color: Light Grey
Was a little tight in the shoulders but otherwise fit great and looks good.
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Reviewed in the United States on April 30, 2026
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Valentin Zahrebelnyj
Massapequa, US
★★★★★ 4
Fabrics Great, Size a little Big, Overall Pretty Good
Size: Medium, Color: Dark Navy
This suit was truly great, the size for the pants and the vest were pretty on point, maybe a little long for the pants. The jacket was way too big though compared to the rest. Overall pretty good suit for the price, very surprised at the build quality and faabrics.
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Reviewed in the United States on April 30, 2026

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