Is m4 10mm profitable to sell on Amazon Japan?

The niche generates ¥413K/yr across 18 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -10.6%. Flapen's verdict: Worth a look (56/100).

How competitive is the m4 10mm niche?

15 brands and 51 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 66% of demand.

What do buyers complain about in m4 10mm?

Top complaints mined from reviews: サイズ全体, 組み立て/インストール. The return rate is 0.4%.

When does demand for m4 10mm peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the m4 10mm niche?

Listings span ¥299.80–¥1147.01; the average listing price is ¥550.54 (sweet spot $15–$100). The average incumbent carries 87 reviews — the moat a new listing must climb.

m4 10mm

Worth a look

Shows low returns (0.4%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.4%

return rate — above 5% kills the launch gate

Review moat

Incredible86.5

avg incumbent reviews — the moat a new listing must climb

Quality gap

Great4.2★

avg incumbent rating — lower means beatable quality

Conversion

Great7.7%

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

Brand share

Good66%

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

Market size

Good¥413K

¥413K/yr · 10K searches

Competition

Good54%

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

Growth

Bad-10.6%

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

Avg price

Bad¥550.54

avg listing price — sweet spot $15–$100

Price range

Bad¥299.80–¥1147.01

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

Signals No Dominant Brand Low Review Barrier High Price

According to Flapen's Amazon Japan niche tracking, m4 10mm is a ¥413K/yr Amazon Japan market (10K searches/yr). The top 5 brands hold 66% of demand. Verdict: Worth a look — 56/100.

Data updated Jul 31, 2026 · scored weekly · How we score niches

m4 10mm market data

Units sold / yr: 500–750; avg 0–100/product
Revenue / yr: ¥275K–¥413K; units × avg price
Conversion rate: 7.7%
Avg BSR: #29
Page quality: 0%
Prime: 100%
Sponsored: 72%
Out of stock: 1.2%
Avg brand age: 45 months
Avg seller age: 173 days

Competition & brand share

The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.

Brands

15 rising

Sellers

Top-5 brand share

66%

Top 20: 100%

Top-5 click share

54%

Top 20: 100%

Open market

27%

nejico(ネジコ)17%
Ysintl16%
トラスコ中山(TRUSCO)13%
ネジのトミモリ10%
SZBRSKJ10%
Mikankawa7%

Demand & seasonality

Weekly Amazon search volume, last 67 weeks — -10.6% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top m4 10mm 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 18 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

10本入りパンヘッド機械ネジ M4*10mm 十字穴付きナベ頭小ネジステンレス製平ワッシャーとスプリングワッシャー付きファスナーボルト DIY工具電子機器修理家具組み立て用

Ysintl¥415.134.2★89 rev

ステンレス/SSブラック (+) スリムヘッド小ねじＭ４×１０ (10本入り)

ネジのトミモリ¥524.034.4★119 rev

8個入り VESA対応ステンレス製ネジセット M4x10mm/M4x8mm/M5x10mm/M5x6mm つまみネジフラットヘッド機械ネジ締めやすいモニターアームスタンド用 TV/モニタ/ラップトップPC/ファン取付け用 (M4x8mm) [並行輸入品]

SZBRSKJ¥657.674.3★27 rev

【M4x10】ステンレストラス頭小ねじ（10本）

nejico(ネジコ)¥533.304.3★60 rev

TRUSCO(トラスコ) トラス頭小ネジステンレス全ネジ M4×10 120本入 B52-0410

トラスコ中山(TRUSCO)¥774.394.3★449 rev

Newest

by launch date

ネジ 10個入り M4 ネジ 10mm モニターアーム簡単取付手回しで簡単ローレットナット

VEAGIA¥440.768 rev

7mo ago

ネジ 10個入り M4 ネジ 10mm ローレットノブ手締め可能工具不要モニターアーム用

Drawheart¥433.464 rev

7mo ago

Nivithi M4皿頭ソケットキャップネジ M4X6/8/10/12/16/20/25mm 六角穴付きボルト 10.9グレード合金鋼ナットセット

Nivithi¥1147.0124 rev

1y ago

Mikankawa ネジ M4ｘ10mmローレットノブ 10個ローレットモニターアーム素手で締められる

Mikankawa¥482.3023 rev

1y ago

SZBRSKJ¥657.6727 rev

1y ago

What buyers say about m4 10mm

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

What buyers love

使用の容易さ32%

“付け替え楽々”

総合品質27%

“良品. 見た目が美しくていいですね。”

取り付け9%

“ネジ自体がしっかりしています。”

広告と実際の製品の違い9%

“期待通りでした。”

コストパフォーマンス9%

“値段も安いし買っちゃえと思って買いました”

材料の品質9%

“素材はステンレス製で丈夫です。”

サイズ全体5%

“当然ですがピッタリでした。”

What buyers complain about

サイズ全体50%

“ヘッドも意外と大きくて、表記通り手回しでシッカリと締められます。”

組み立て/インストール50%

“モニターアームが増えるとネジが足りず、. 別のドライバーが必要なネジを取り付けていたりしたのですが、地味に不便だったので、こちらのネジだけ.”

Top return reasons

サイズ全体32%

互換性-全体27%

匂い9%

使用の容易さ9%

組み立て/インストール9%

広告と実際の製品の違い9%

不良材料/部品5%

Common questions

Is m4 10mm profitable to sell on Amazon Japan?: The niche generates ¥413K/yr across 18 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -10.6%. Flapen's verdict: Worth a look (56/100).
How competitive is the m4 10mm niche?: 15 brands and 51 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 66% of demand.
What do buyers complain about in m4 10mm?: Top complaints mined from reviews: サイズ全体, 組み立て/インストール. The return rate is 0.4%.
When does demand for m4 10mm peak?: Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the m4 10mm niche?: Listings span ¥299.80–¥1147.01; the average listing price is ¥550.54 (sweet spot $15–$100). The average incumbent carries 87 reviews — the moat a new listing must climb.

m4 10mm

m4 10mm market data

Competition & brand share

Demand & seasonality

Top m4 10mm products on Amazon

Top sellers

Newest

Trending

What buyers say about m4 10mm

What buyers love

What buyers complain about

Top return reasons

Common questions

Related niches in DIY・工具・ガーデン