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59

プラグレンチ 14mm

Worth a look

Shows a $3.0M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 96Growth 16Conversion 81Competition 42Returns 96Price range 0Avg price 0Brand share 65Review moat 79Quality gap 73

Market size

Incredible¥3.0M

¥3.0M/yr · 35K searches

Returns

Incredible0.8%

return rate — above 5% kills the launch gate

Conversion

Great8.5%

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

Review moat

Great417.39

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Brand share

Good66%

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

Competition

Okay60%

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

Growth

Bad-17.1%

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

Avg price

Bad¥1000.86

avg listing price — sweet spot $15–$100

Price range

Bad¥348.56–¥3705.22

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

According to Flapen's Amazon Japan niche tracking, プラグレンチ 14mm is a ¥3.0M/yr Amazon Japan market (35K searches/yr). The top 5 brands hold 66% of demand. Verdict: Worth a look — 59/100.

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

プラグレンチ 14mm market data

Units sold / yr
3K–3K
avg 0–100/product
Revenue / yr
¥2.5M–¥3.0M
units × avg price
Conversion rate
8.5%
Avg BSR
#43
Page quality
0%
Prime
91%
Sponsored
70%
Out of stock
7.7%
Avg brand age
51 months
Avg seller age
189 days

Competition & brand share

The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them.

Brands

21 flat

Sellers

76

Top-5 brand share

66%

Top 20: 99%

Top-5 click share

60%

Top 20: 97%

Open market

29%

  • トネ(TONE)18%
  • エーモン(amon)16%
  • VEAGIA15%
  • Pseul10%
  • Mirhua7%
  • 京都機械工具(KTC)5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -17.1% search growth over the last 90 days.
1K600Spike '24Spike '25Prime Day '25Black Friday '25SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.3×

Top プラグレンチ 14mm 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%¥151K10%¥302K15%¥453K20%¥604K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 23 tracked products in this niche — three views at once, no toggling.

What buyers say about プラグレンチ 14mm

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

What buyers love

使用の容易さ26%

“普通に使えます。”

磁力/吸着力19%

“磁石安心です”

コストパフォーマンス17%

“お手頃価格”

コネクタ/ポート/プラグ10%

“必要なサイズが揃っていて使いやすいT型プラグレンチセット”

総合品質8%

“良い商品です。”

サイズ全体5%

“全長が長すぎず短すぎず、エクステンションバーとの組み合わせ次第で様々な車種に対応できそうです。”

強さ3%

“安定のエーモン”

握り心地2%

“ハンドルの長さを活かして固着したプラグにも力を伝達しやすく、作業の確実性を高める工夫を施しています。”

広告と実際の製品の違い1%

“説明道理です”

調整可能性/回転機能/リクライニング機能 1%

“ヘッド部分は角度を変えられる可動式で、エンジンルームの奥まった場所や狭いスペースでも扱いやすくなっています。”

What buyers complain about

磁力/吸着力10%

“磁石が弱くプラグが落ちかけてしまいます。”

総合品質9%

“品質に難ありです。”

コストパフォーマンス8%

“値段なりです。”

サイズ全体8%

“延長を使うと微妙に長すぎて”

厚み7%

“デミオ(平成25年5月)/スカイアクティブには肉厚の薄いタイプが必須です”

薄い6%

“薄い”

測定/読み取り精度4%

“トルクは、正確なのか分からないがコスパ良し”

コネクタ/ポート/プラグ4%

“セレナcc25には中央部のビスがつっかえてプラグの穴に入らなかった。”

互換性-全体4%

“nbox jf3に使えない”

広告と実際の製品の違い3%

“まずプラケースのロゴマークが説明写真と違っていたので、違う商品が送られて来たのかと思い急いでプラケースを開けて中身を確認、ただロゴマークが新しくなっただけでした。”

Top return reasons

サイズ全体35%
広告と実際の製品の違い12%
磁力/吸着力12%
コネクタ/ポート/プラグ9%
商品の状態6%
追加アイテム/添付ファイル5%
不良材料/部品3%
機能全体3%
耐久性2%
硬い感覚2%

Common questions

Is プラグレンチ 14mm profitable to sell on Amazon Japan?
The niche generates ¥3.0M/yr across 23 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is -17.1%. Flapen's verdict: Worth a look (59/100).
How competitive is the プラグレンチ 14mm niche?
21 brands and 76 sellers compete. The top 5 products take 60% of clicks and top 5 brands hold 66% of demand.
What do buyers complain about in プラグレンチ 14mm?
Top complaints mined from reviews: 磁力/吸着力, 総合品質, コストパフォーマンス. The return rate is 0.8%.
When does demand for プラグレンチ 14mm peak?
Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the プラグレンチ 14mm niche?
Listings span ¥348.56–¥3705.22; the average listing price is ¥1000.86 (sweet spot $15–$100). The average incumbent carries 417 reviews — the moat a new listing must climb.