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63

10mm レンチ

Worth a look

Shows low returns (0.5%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 95Growth 24Conversion 62Competition 74Returns 97Price range 0Avg price 0Brand share 73Review moat 55Quality gap 77

Returns

Incredible0.5%

return rate — above 5% kills the launch gate

Market size

Incredible¥2.3M

¥2.3M/yr · 53K searches

Quality gap

Great4.3★

avg incumbent rating — lower means beatable quality

Competition

Good41%

top-5 click share — leaders hold, buyers still browse

Brand share

Good61%

top-5 brand share — brands hold most of the demand

Conversion

Good5.5%

search→purchase rate — share of searches ending in a sale

Review moat

Good1,307.89

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-2.3%

90-day search growth — must beat 0% to launch

Avg price

Bad¥785.29

avg listing price — sweet spot $15–$100

Price range

Bad¥268.37–¥3420.05

cheapest to priciest tracked listing — scored on the share inside $15–$100

According to Flapen's Amazon Japan niche tracking, 10mm レンチ is a ¥2.3M/yr Amazon Japan market (53K searches/yr). The top 5 brands hold 61% of demand. Demand peaks in Apr. Verdict: Worth a look — 63/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

10mm レンチ market data

Units sold / yr
3K–3K
avg 0–100/product
Revenue / yr
¥2.0M–¥2.4M
units × avg price
Conversion rate
5.5%
Avg BSR
#34
Page quality
0%
Prime
100%
Sponsored
63%
Out of stock
2.1%
Avg brand age
59 months
Avg seller age
191 days

Competition & brand share

The top 5 products take 41% of clicks — established leaders, but buyers still shop beyond them.

Brands

20 falling

Sellers

85

Top-5 brand share

61%

Top 20: 100%

Top-5 click share

41%

Top 20: 84%

Open market

33%

  • トネ(TONE)26%
  • Amazonベーシック(Amazon Basics)11%
  • TAKAGI10%
  • DFsucces8%
  • FLZOSPER6%
  • trad(トラッド)6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -2.3% search growth over the last 90 days.
1K750Spike '24Holiday '24Prime Day '25Spike '25Black Friday '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Apr · busiest ÷ quietest = 2.3×

Top 10mm レンチ search terms

  • 10mm レンチ14K/yr
  • 10mm ラチェットレンチ9K/yr
  • メガネレンチ 10mm8K/yr
  • レンチ 10mm6K/yr
  • 10mm6K/yr
  • 10ミリレンチ5K/yr
  • ラチェットレンチ 10mm6K/yr
All search terms

Top 10mm レンチ 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%4%¥92K8%¥183K12%¥275K16%¥367K101001K10K100K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 24 tracked products in this niche — three views at once, no toggling.

What buyers say about 10mm レンチ

What buyers praise and complain about, mined from review topics.

What buyers love

使用の容易さ32%

“使えます”

コストパフォーマンス19%

“お手頃でコスパ良いです。”

総合品質8%

“ケースの作りが良い”

サイズ全体6%

“FIT GR バッテリー交換にシンデレラフィット。 10mm購入。この小ささと貫通ソケットは、補機バッテリの交換用車載工具にぴったり。FIT GR用”

強さ3%

“手頃な大きさでギアも強い。”

耐久性2%

“まあ使えてます。”

コンパクトさ2%

“コンパクトでバイクのサイドバックに入れてます。”

メンテナンスと修理2%

“軽整備に最適”

広告と実際の製品の違い2%

“理想通り”

ロック機構2%

“こちらはラチェット機能も付いており、ほかのレンチの受けとしてもラチェットとしても使える。”

What buyers complain about

耐久性11%

“耐久性は分かりませんが”

サイズ全体10%

“小さいが使いやすい”

使用の容易さ10%

“使いづらい”

強さ5%

“ケースがイマイチ”

総合品質5%

“ゴミ”

コストパフォーマンス4%

“値段なりです”

厚み3%

“100均だと厚みがあり、ロックナット解除時上手くはまらずナットをなめる事がおおくなりました。”

磁力/吸着力2%

“ビット先端の磁力が強いのか、ソケット側が弱いのか、回したあとボルト側にビット先端がくっいていちいち外れて面倒。”

材料の品質2%

“材質は弱い部分などはありますが、簡単なメンテナンスなどには重宝してます。”

互換性-全体2%

Top return reasons

サイズ全体36%
不良材料/部品13%
機能全体9%
総合品質5%
互換性-全体5%
握り心地4%
商品の状態4%
追加アイテム/添付ファイル4%
メカニズムの問題4%
広告と実際の製品の違い4%

Common questions

Is 10mm レンチ profitable to sell on Amazon Japan?
The niche generates ¥2.3M/yr across 35 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is -2.3%. Flapen's verdict: Worth a look (63/100).
How competitive is the 10mm レンチ niche?
20 brands and 85 sellers compete. The top 5 products take 41% of clicks and top 5 brands hold 61% of demand.
What do buyers complain about in 10mm レンチ?
Top complaints mined from reviews: 耐久性, サイズ全体, 使用の容易さ. The return rate is 0.5%.
When does demand for 10mm レンチ peak?
Demand peaks in Apr; the busiest month runs 2.3× the quietest.
What does it cost to enter the 10mm レンチ niche?
Listings span ¥268.37–¥3420.05; the average listing price is ¥785.29 (sweet spot $15–$100). The average incumbent carries 1,308 reviews — the moat a new listing must climb.