---
title: "Kobalt 40v Trimmer Head Replacement — $22K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/kobalt-40v-trimmer-head-replacement"
last_updated: "2026-08-11T14:45:06.531Z"
locale: en
meta:
description: "Niche score 54/100 · $22K/yr market · 40K searches/yr · $22.80 avg price. A small market ($22K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 54/100 · $22K/yr market · 40K searches/yr · $22.80 avg price. A small market ($22K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Kobalt 40v Trimmer Head Replacement — $22K/yr Amazon US Niche (2026) - Flapen"
---
# **kobalt 40v trimmer head replacement**
**Worth a look**
Shows beatable incumbent ratings (3.7★), but a small market ($22K/yr) keeps it on the watch list.
Market size 5Growth 96Conversion 30Competition 43Returns 28Price range 83Avg price 95Brand share 39Review moat 84Quality gap 98
**Quality gap**
**Incredible****3.7★**
avg incumbent rating — lower means beatable quality
**Growth**
**Incredible****+157.8%**
90-day search growth — must beat 0% to launch
**Avg price**
**Incredible****$22.80**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****328.76**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Great****$11.28–$36.43**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****59%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****82%**
top-5 brand share — brands hold most of the demand
**Conversion**
**Okay****2.4%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Okay****4.7%**
return rate — above 5% kills the launch gate
**Market size**
**Bad****$22K**
$22K/yr · 40K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** Quality Gap**](https://flapen.com/research/niches?market=us&signal=quality_gap "Avg rating < 4.0")
According to Flapen's Amazon United States niche tracking, kobalt 40v trimmer head replacement is a $22K/yr Amazon United States market (40K searches/yr). The top 5 brands hold 82% of demand. Verdict: Worth a look — 54/100.
Data updated Jul 16, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **kobalt 40v trimmer head replacement market data**
- **Units sold / yr**
- **1K–1K**
- avg 0–100/product
- **Revenue / yr**
- **$23K–$29K**
- units × avg price
- **Conversion rate**
- **2.4%**
- **Avg BSR**
- **#1,349**
- **Page quality**
- **0%**
- **Prime**
- **95%**
- **Sponsored**
- **86%**
- **Out of stock**
- **6.7%**
- **Avg brand age**
- **35 months**
- **Avg seller age**
- **146 days**
## **Competition & brand share**
The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**12 **▼falling
**Sellers**
**52**
**Top-5 brand share**
**82%**
Top 20: 100%
**Top-5 click share**
**59%**
Top 20: 100%
**Open market**
**14%**
- Eyoloty28% - Kaberalty17% - Katifee15% - THTEN13% - WEED WARRIOR9% - Uietuc4% - Open — no brand owns it (6 brands, 14%)
## **Top kobalt 40v trimmer head replacement search terms**
- **kobalt 40v string trimmer replacement head**17K/yr+198.6%1.4% conv. - **kobalt 40v replacement head**7K/yr+92.4%1.1% conv. - **kobalt 40v trimmer head replacement**12K/yr+97.3%1.7% conv. - **kobalt 40v trimmer head**4K/yr+358.2%1.2% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/kobalt-40v-trimmer-head-replacement/search-terms)
## **Top kobalt 40v trimmer head replacement products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$1K10%$2K15%$3K20%$4K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**KTHA 1040-03 Weed Eater Head Replacement Compatible with Kobalt 80V KST 1680-06 40V KST 2540-06 KST 1040A-03 24V KST 224A-03 KST 224B-03 Cordless String Trimmer with 0.080 17 Ft Pre-Cut Dual Line**Eyoloty**$24.32**3.1★37 rev](https://www.amazon.com/dp/B0GXD2WCGM) [2**Kaberalty KTHA1040-03 KST2580-06 4665020 Replacement Trimmer Head Compatible with Kobalt KST224A-03 KST224B-03 KST1040A-03 KMS1040A-03 KST2540-06 KST1540-06 with 0.080 precut line**Kaberalty**$24.83**3.4★19 rev](https://www.amazon.com/dp/B0GXD38PZK) [3**KST2580-06 KTHA1040-03 Replacement Trimmer Head Bump Knob Accessory Compatible with Kobalt 40V KST1040A-03 KST1040B-03 KST1540-06 KST224A-03 KST224B-03 KST2540-06 String Trimmers 4Pack**Katifee**$21.00**4.4★12 rev](https://www.amazon.com/dp/B0F94KJFFW) [4**Weed Warrior Autowinder II Universal Fit String Trimmer Replacement Bump Head**WEED WARRIOR**$24.83**4.0★1,953 rev](https://www.amazon.com/dp/B00N6XBKFM) [5**Eyoloty KST 120X KST 120X-06 Replacement Trimmer Head Compatible with Kobalt 40-Volt Max KST 2040-06 KDLA 3040-03 Weed Eater with 14 Pack Quickload Blades & 8 Pack 0.12 Flexible Line Parts (30 Pack)**Eyoloty**$25.83**2.5★57 rev](https://www.amazon.com/dp/B0CXHNMM1V)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**KST-130X Replacement String Trimmer Head for Kobalt 40-Volt 1-Pack**VinneMOO**$35.66**0 rev1mo ago](https://www.amazon.com/dp/B0H3TTKBD6) [**Katifee KST-130X Replacement String Trimmer Head for Kobalt 40-Volt String Trimmer Models KST 130X-06 and KST 130X String Trimmer 0.080-inch 1-Pack**Katifee**$36.43**2 rev1mo ago](https://www.amazon.com/dp/B0H3QP4MLM) [**KTHA 1040-03 Weed Eater Head Replacement Compatible with Kobalt 80V KST 1680-06 40V KST 2540-06 KST 1040A-03 24V KST 224A-03 KST 224B-03 Cordless String Trimmer with 0.080 17 Ft Pre-Cut Dual Line**Eyoloty**$24.32**37 rev3mo ago](https://www.amazon.com/dp/B0GXD2WCGM) [**Kaberalty KTHA1040-03 KST2580-06 4665020 Replacement Trimmer Head Compatible with Kobalt KST224A-03 KST224B-03 KST1040A-03 KMS1040A-03 KST2540-06 KST1540-06 with 0.080 precut line**Kaberalty**$24.83**19 rev3mo ago](https://www.amazon.com/dp/B0GXD38PZK) [**PEHUAP Trimmer Head Replacement Fits Kobalt 24V 12 inch String Trimmer**PEHUAP**$23.75**2 rev4mo ago](https://www.amazon.com/dp/B0GRHYLT99)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**PEHUAP Trimmer Head Replacement Fits Kobalt 24V 12 inch String Trimmer**PEHUAP**$23.75**5.0★**▲ 105%**](https://www.amazon.com/dp/B0GRHYLT99) [**Katifee KST-130X Replacement String Trimmer Head for Kobalt 40-Volt String Trimmer Models KST 130X-06 and KST 130X String Trimmer 0.080-inch 1-Pack**Katifee**$36.43**3.0★**▲ 104%**](https://www.amazon.com/dp/B0H3QP4MLM) [**KTHA 1040-03 Weed Eater Head Replacement Compatible with Kobalt 80V KST 1680-06 40V KST 2540-06 KST 1040A-03 24V KST 224A-03 KST 224B-03 Cordless String Trimmer with 0.080 17 Ft Pre-Cut Dual Line**Eyoloty**$24.32**3.1★**▲ 104%**](https://www.amazon.com/dp/B0GXD2WCGM) [**Kaberalty KTHA1040-03 KST2580-06 4665020 Replacement Trimmer Head Compatible with Kobalt KST224A-03 KST224B-03 KST1040A-03 KMS1040A-03 KST2540-06 KST1540-06 with 0.080 precut line**Kaberalty**$24.83**3.4★**▲ 104%**](https://www.amazon.com/dp/B0GXD38PZK) [**KST-130X Replacement String Trimmer Head for Kobalt 40-Volt 1-Pack**VinneMOO**$35.66**0.0★**▲ 102%**](https://www.amazon.com/dp/B0H3TTKBD6)
**~~View all trending →~~**
## **What buyers say about kobalt 40v trimmer head replacement**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**35%
*“Direct fit”*
**Assembly/Installation**10%
*“make it work to install”*
**Advertised Vs Actual Product**7%
*“Works as expected”*
**Cutting/Trimming**6%
*“has been cutting through grass”*
**Ease Of Use**6%
*“Quick & easy”*
**Quality-Overall**6%
*“Excellent quality and very easy to install”*
**Value For Money**6%
*“offers great value for the price”*
**Durability**3%
*“Works really well very durable”*
**Functionality-Overall**2%
*“They work perfectly fine in my trimmers”*
**Material Quality**2%
*“The plastic seems to be the same quality”*
### **What buyers complain about **
**Size-Overall**22%
*“Does not fit out of the box”*
**Durability**12%
*“Broke after 1 use”*
**Ease Of Use**11%
*“Difficult to operate”*
**Advertised Vs Actual Product**8%
*“False Advertsing”*
**Assembly/Installation**7%
*“While it was a bit tricky to get apart during installation”*
**Quality-Overall**6%
*“Absolutely terrible product”*
**Defective Material/Parts**3%
*“But again like I said I was able to use 3 pieces from the broken one”*
**Value For Money**3%
*“definitely not worth $20”*
**Functionality-Overall**3%
*“Cannot get it to snap on my Kobalt trimmer”*
**Cutting/Trimming**2%
*“I hate string trimmers”*
### **Top return reasons **
**Size-Overall**61%
**Advertised Vs Actual Product**13%
**Defective Material/Parts**6%
**Functionality-Overall**6%
**Add-Ons/Attachments**3%
**Assembly/Installation**3%
**Durability**2%
**Mechanism Issues**1%
**Mounting**1%
**Cutting/Trimming**1%
## **Common questions**
- **Is kobalt 40v trimmer head replacement profitable to sell on Amazon United States?**
- The niche generates $22K/yr across 21 tracked products. 2 of 8 products launched in the last 360 days are still selling. 90-day search growth is +157.8%. Flapen's verdict: Worth a look (54/100).
- **How competitive is the kobalt 40v trimmer head replacement niche?**
- 12 brands and 52 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 82% of demand.
- **What do buyers complain about in kobalt 40v trimmer head replacement?**
- Top complaints mined from reviews: Size-Overall, Durability, Ease Of Use. The return rate is 4.7%.
- **What does it cost to enter the kobalt 40v trimmer head replacement niche?**
- Listings span $11.28–$36.43; the average listing price is $22.80 (sweet spot $15–$100). The average incumbent carries 329 reviews — the moat a new listing must climb.
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