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12.7 9.5 変換

Skip it

Pricing outside the sweet spot ($730.84 avg) — this niche doesn't clear our bar today.

Market size 68Growth 18Conversion 78Competition 18Returns 98Price range 0Avg price 0Brand share 10Review moat 66Quality gap 62

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Conversion

Great7.8%

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

Market size

Good¥700K

¥700K/yr · 12K searches

Review moat

Good853.75

avg incumbent reviews — the moat a new listing must climb

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Growth

Bad-14.1%

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

Competition

Bad79%

top-5 click share — a locked-up shelf

Brand share

Bad96%

top-5 brand share — brand-locked demand

Avg price

Bad¥730.84

avg listing price — sweet spot $15–$100

Price range

Bad¥264.77–¥1208.52

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

According to Flapen's Amazon Japan niche tracking, 12.7 9.5 変換 is a ¥700K/yr Amazon Japan market (12K searches/yr). The top 5 brands hold 96% of demand. Demand peaks in Apr–May–Jun. Verdict: Skip it — 44/100.

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

12.7 9.5 変換 market data

Units sold / yr
750–1K
avg 0–100/product
Revenue / yr
¥548K–¥731K
units × avg price
Conversion rate
7.8%
Avg BSR
#16
Page quality
0%
Prime
92%
Sponsored
58%
Out of stock
0.0%
Avg brand age
69 months
Avg seller age
196 days

Competition & brand share

The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 falling

Sellers

50

Top-5 brand share

96%

Top 20: 100%

Top-5 click share

79%

Top 20: 100%

Open market

2%

  • トネ(TONE)59%
  • SK11(エスケー11)15%
  • WORKPRO12%
  • サンドリー(Sundry)6%
  • HAODEOO4%
  • 京都機械工具(KTC)2%
  • Open — no brand owns it (1 brand, 2%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -14.1% search growth over the last 90 days.
400300Spike '24Holiday '24Spike '25Black Friday '25Spike '26Prime Day '26SepDecMarJunAugNovMarMay

Peak months: Apr, May, Jun · busiest ÷ quietest = 1.9×

Top 12.7 9.5 変換 search terms

  • 12.7 9.5 変換ソケット3K/yr
  • 3/8 1/2 変換5K/yr
  • 1/2 3/8 変換ソケット4K/yr
All search terms

Top 12.7 9.5 変換 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%10%¥70K20%¥140K30%¥210K40%¥280K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 12 tracked products in this niche — three views at once, no toggling.

What buyers say about 12.7 9.5 変換

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18%

“コスパが良い”

総合品質18%

“品質良し. 特に問題なく使用しております。派手さは無いですが、品質も良く信頼できる老舗ブランド。価格も割とリーズナブルに感じます。”

サイズ全体7%

“サイズ”

コネクタ/ポート/プラグ4%

“便利なソケットです。”

強さ3%

“しっかりしてる”

耐久性3%

“耐久性は問題無い”

ロック機構2%

“ロックナットレンチなどの普段使わないような工具をパッと変換できるのは便利です。”

柔らかい感触2%

“しっかりした使用感”

握り心地2%

“保持具としていいです。”

What buyers complain about

総合品質18%

“安くてとりあえず全然使える”

機能全体14%

“はめたら外れなくなっちゃった。”

漏れ防止9%

“エアーコンプレッサのオイルゲージからオイルが少し漏れてました。”

強さ9%

“ソケットを止めるボールが弱い。”

使用の容易さ9%

“ちょっと外しにくかったです。”

サイズ全体5%

“この商品はサイズを1サイズ小さくするものですが、問題なく使えました.”

耐久性5%

“プロの整備士では無いので、耐久性や強度を重視はしませんでしたが、電動インパクトレンチに使っても大丈夫でした。”

生锈/腐食する5%

“パーツそれぞれが錆防止のためか黒い油まみれの状態で驚きました。”

Top return reasons

不良材料/部品28%
サイズ全体22%
使用の容易さ14%
強さ8%
コネクタ/ポート/プラグ6%
硬い感覚6%
広告と実際の製品の違い6%
総合品質6%
機能全体3%
測定/読み取り精度3%

Common questions

Is 12.7 9.5 変換 profitable to sell on Amazon Japan?
The niche generates ¥700K/yr across 12 tracked products. 90-day search growth is -14.1%. Flapen's verdict: Skip it (44/100).
How competitive is the 12.7 9.5 変換 niche?
7 brands and 50 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 96% of demand.
What do buyers complain about in 12.7 9.5 変換?
Top complaints mined from reviews: 総合品質, 機能全体, 漏れ防止. The return rate is 0.3%.
When does demand for 12.7 9.5 変換 peak?
Demand peaks in Apr–May–Jun; the busiest month runs 1.9× the quietest.
What does it cost to enter the 12.7 9.5 変換 niche?
Listings span ¥264.77–¥1208.52; the average listing price is ¥730.84 (sweet spot $15–$100). The average incumbent carries 854 reviews — the moat a new listing must climb.