spark plug thread repair kit
Worth a lookShows a sweet-spot price point ($42.71 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Avg price
Incredible$42.71avg listing price — sweet spot $15–$100
Brand share
Great45%top-5 brand share — no brand owns this niche
Review moat
Great251.97avg incumbent reviews — the moat a new listing must climb
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Competition
Good43%top-5 click share — leaders hold, buyers still browse
Growth
Okay+19.9%90-day search growth — must beat 0% to launch
Price range
Okay$8.52–$203.09cheapest to priciest tracked listing — scored on the share inside $15–$100
Returns
Okay3.8%return rate — above 5% kills the launch gate
Conversion
Okay3.1%search→purchase rate — share of searches ending in a sale
Market size
Okay$121K$121K/yr · 90K searches
According to Flapen's Amazon United States niche tracking, spark plug thread repair kit is a $121K/yr Amazon United States market (90K searches/yr). The top 5 brands hold 45% of demand. Demand peaks in May. Verdict: Worth a look — 58/100.
Data updated Jul 12, 2026 · scored weekly · How we score niches
spark plug thread repair kit market data
- Units sold / yr
- 3K–4K
- avg 0–100/product
- Revenue / yr
- $128K–$171K
- units × avg price
- Conversion rate
- 3.1%
- Avg BSR
- #88
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 81%
- Out of stock
- 5.9%
- Avg brand age
- 45 months
- Avg seller age
- 163 days
Competition & brand share
The top 5 products take 43% of clicks — established leaders, but buyers still shop beyond them.Brands
34 rising
Sellers
108
Top-5 brand share
45%
Top 20: 89%
Top-5 click share
43%
Top 20: 86%
Open market
49%
- MARKETTY11%
- NINEFOX11%
- CLLOMAGY9%
- Cal-Van Tools7%
- SHMZK7%
- XuYelora6%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +19.9% search growth over the last 90 days.Peak months: May · busiest ÷ quietest = 2.7×
Top spark plug thread repair kit search terms
- spark plug thread repair kit23K/yr
- spark plug repair kit17K/yr
- ford spark plug repair kit13K/yr
- spark plug helicoil kit8K/yr
- spark plug rethread kit7K/yr
- ford 5.4 spark plug repair kit5K/yr
- thread spark plug thread repair kits4K/yr
- stripped spark plug repair kit4K/yr
- triton spark plug repair kit3K/yr
- calvan spark plug repair kit3K/yr
Top spark plug thread repair kit 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
MARKETTY 38900 Two Valve Ford Triton Tool Kit Foolproof Repair System Spark Plug Thread Repair Kit Compatible with 4.6L 5.4L and 6.8 V-10 Ford Triton Two Valve Engines (Black)
MARKETTY$65.574.6★223 rev
CLLOMAGY 38900 Two Valve Tool Kit for Ford Triton Spark Plug Thread Repair Kit Foolproof Spark Plug Repair System Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine
CLLOMAGY$65.644.7★148 rev
NINEFOX Spark Plug Thread Repair Kit M14x1.25 11 PCS Insert and Tap Set 10 Inserts + 1 Tap for Cylinder Head Rethreading Cars Trucks Generators
NINEFOX$15.854.6★62 rev
CalVan Tools 38900 Two Valve Ford Triton Tool Kit - Foolproof Repair System Spark Plug Thread Repair Kit. Tools and Equipment
Cal-Van Tools$203.094.8★2,694 rev
SHMZK 11 PCS Spark Plug Thread Repair Kit M141.25 Inserts and M161.25 Tap Spark Plug Rethreading Set Stainless Steel Thread Repair Tool Kit for Automotive Gasoline Engines Generators
SHMZK$13.124.4★73 rev
Newest
by launch date
GEARCESS 38900 Two Valve Tool Kit for Ford Triton Spark Plug Repair Kit Spark Thread Plug Repair Kit Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine
GEARCESS$77.822 rev
KJE 38900 Two Valve Ford Triton Tool Kit Spark Plug Thread Repair Kit Compatible with Ford 4.6 L 5.4 L 6.8V-10 SOHC Engines Foolproof Repair System for No.389-100 Replacement Inserts 1/2 Drive
KJE$65.204 rev
Ritammi Spark Plug Repair Kit 16Pcs Carbon Steel Spark Plug Tap Thread Repair Tools M14 X 1.25 Rethreading Set with Portable Case
Ritammi$17.7516 rev
XuYelora Spark Plug Thread Repair kit M10x1.0 Bolt M12x1.0 Tap Stainless Steel Repair kit for Automotive Engine Cylinder Head Rethreaded Kit Repairs Tools(Color:Silver)
XuYelora$13.2426 rev
UHANBUT Spark Plug Thread Repair Kit Stainless Steel Car Repair Tool Accessories Include M141.25 Thread Inserts and M161.25 Tap Suitable for Automotive Gasoline Engines Generators
UHANBUT$12.5021 rev
Trending
90-day click momentumGEARCESS 38900 Two Valve Tool Kit for Ford Triton Spark Plug Repair Kit Spark Thread Plug Repair Kit Compatible with Ford F150/250/350 E150/250/350 4.6L 5.4L 6.8L Two Valve Engine
GEARCESS$77.822.5★
KJE 38900 Two Valve Ford Triton Tool Kit Spark Plug Thread Repair Kit Compatible with Ford 4.6 L 5.4 L 6.8V-10 SOHC Engines Foolproof Repair System for No.389-100 Replacement Inserts 1/2 Drive
KJE$65.205.0★
BZBMGMO M10 X 1.0X12.7 Spark Plug Repair Short Tooling KIT Metric Thread Repair Kit Especially Suitable for Repairing Motorcycle UTV ATV and Snowmobile Spark Plug Repair
BZBMGMO$55.054.2★
XuYelora Spark Plug Thread Repair kit M10x1.0 Bolt M12x1.0 Tap Stainless Steel Repair kit for Automotive Engine Cylinder Head Rethreaded Kit Repairs Tools(Color:Silver)
XuYelora$13.244.2★
NINEFOX Spark Plug Thread Repair Kit M12x1.25 11 PCS Insert and Tap Set 10 Inserts + 1 Tap for Cylinder Head Rethreading Cars Trucks Generators
NINEFOX$15.074.6★
What buyers say about spark plug thread repair kit
What buyers praise and complain about, mined from review topics.What buyers love
“Functions as advertised”
“Good quality set at a good price”
“Great price”
“Easy to use”
“Works well”
“Clear instructions and a quality tool”
“Everything fits perfectly”
“Good, solid set”
“These are very durable”
“Easy to use all needed accessories”
What buyers complain about
“Bad Quality”
“That cant even spell spark correctly on the box”
“no instructions”
“Broke within 5 minutes of use”
“Cheap material”
“Bad cheap metal it will make your car w I use”
“Thread reamer socket head is too big”
“Its cheaper in the long run”
“unusable after one use”
“a bit long”
Top return reasons
Common questions
- Is spark plug thread repair kit profitable to sell on Amazon United States?
- The niche generates $121K/yr across 36 tracked products. 1 of 9 products launched in the last 360 days are still selling. 90-day search growth is +19.9%. Flapen's verdict: Worth a look (58/100).
- How competitive is the spark plug thread repair kit niche?
- 34 brands and 108 sellers compete. The top 5 products take 43% of clicks and top 5 brands hold 45% of demand.
- What do buyers complain about in spark plug thread repair kit?
- Top complaints mined from reviews: Quality-Overall, Functionality-Overall, Instructions/User Manual/Troubleshooting. The return rate is 3.8%.
- When does demand for spark plug thread repair kit peak?
- Demand peaks in May; the busiest month runs 2.7× the quietest.
- What does it cost to enter the spark plug thread repair kit niche?
- Listings span $8.52–$203.09; the average listing price is $42.71 (sweet spot $15–$100). The average incumbent carries 252 reviews — the moat a new listing must climb.