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46

nema 6-20 extension cord

Skip it

A small market ($44K/yr) — this niche doesn't clear our bar today.

Market size 11Growth 41Conversion 67Competition 61Returns 22Price range 91Avg price 95Brand share 42Review moat 87Quality gap 19

Avg price

Incredible$36.30

avg listing price — sweet spot $15–$100

Price range

Great$12.20–$73.97

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

Review moat

Great269.77

avg incumbent reviews — the moat a new listing must climb

Conversion

Good6.0%

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

Competition

Good48%

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

Brand share

Okay80%

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

Growth

Okay+12.6%

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

Returns

Bad5.8%

return rate — above 5% kills the launch gate

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$44K

$44K/yr · 20K searches

Signals High Returns

According to Flapen's Amazon United States niche tracking, nema 6-20 extension cord is a $44K/yr Amazon United States market (20K searches/yr). The top 5 brands hold 80% of demand. Verdict: Skip it — 46/100.

Data updated Jul 27, 2026 · scored weekly · How we score niches

nema 6-20 extension cord market data

Units sold / yr
1K–1K
avg 0–100/product
Revenue / yr
$36K–$45K
units × avg price
Conversion rate
6.0%
Avg BSR
#711
Page quality
0%
Prime
100%
Sponsored
88%
Out of stock
11.9%
Avg brand age
42 months
Avg seller age
212 days

Competition & brand share

The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.

Brands

12 rising

Sellers

18

Top-5 brand share

80%

Top 20: 100%

Top-5 click share

48%

Top 20: 93%

Open market

15%

  • Parkworld36%
  • PLUGTUL15%
  • Saysurey11%
  • oviitech10%
  • M1A28%
  • EP6%
  • Open — no brand owns it (6 brands, 15%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +12.6% search growth over the last 90 days.
600400Spike '25Prime Day '25Spike '26SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top nema 6-20 extension cord 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%$2K10%$4K15%$7K20%$9K101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

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

Top sellers

by 90-day click share
1
Parkworld NEMA 6-20 Extension Cord 6-20P to 6-20R (T Blade Female Also for 6-15R Adapter) 250V 20A 5000W UL Listed (25FT)

Parkworld NEMA 6-20 Extension Cord 6-20P to 6-20R (T Blade Female Also for 6-15R Adapter) 250V 20A 5000W UL Listed (25FT)

Parkworld$44.934.8★1,012 rev

2
NEMA 6-20 Plug to 6-20 Connector Extension Power Cord - 25FT 20A/250V 12/3 SJTW T Blade - Black

NEMA 6-20 Plug to 6-20 Connector Extension Power Cord - 25FT 20A/250V 12/3 SJTW T Blade - Black

oviitech$39.054.8★290 rev

3
Parkworld NEMA 6-20 Extension Cord 6-20P to 6-20R (T Blade Female Also for 6-15R Adapter) 250V 20A 5000W UL Listed (6FT)

Parkworld NEMA 6-20 Extension Cord 6-20P to 6-20R (T Blade Female Also for 6-15R Adapter) 250V 20A 5000W UL Listed (6FT)

Parkworld$24.284.8★1,012 rev

4
PLUGTUL NEMA 6-20 Extension Cord 25FT Heavy Duty Extension Cord with Lighted Outlet 20A/250V 12Gauge SJTW ETL Listed 6-20P to 6-20R (T Blade Female Adapter) - Black

PLUGTUL NEMA 6-20 Extension Cord 25FT Heavy Duty Extension Cord with Lighted Outlet 20A/250V 12Gauge SJTW ETL Listed 6-20P to 6-20R (T Blade Female Adapter) - Black

PLUGTUL$36.124.8★34 rev

5
M1A2 NEMA 6-20 Extension Cord 6-20P to 6-20R [Also for 6-15R Adapter] Tesla Mobile EV Level 2 Charging Heavy Duty 220 Volts 20 Amp 25FT ETL Listed

M1A2 NEMA 6-20 Extension Cord 6-20P to 6-20R [Also for 6-15R Adapter] Tesla Mobile EV Level 2 Charging Heavy Duty 220 Volts 20 Amp 25FT ETL Listed

M1A2$43.254.8★47 rev

Newest

by launch date
Saysurey 50 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey 50 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey$70.0934 rev

8mo ago
Saysurey NEMA 6-20 Extension Cord NEMA 6-20P Male Plug to 6-20R/6-15R Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 AWG 250V 5000W(16 ft)

Saysurey NEMA 6-20 Extension Cord NEMA 6-20P Male Plug to 6-20R/6-15R Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 AWG 250V 5000W(16 ft)

Saysurey$34.4134 rev

8mo ago
Saysurey 6.6 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey 6.6 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey$19.5034 rev

8mo ago
Saysurey 25 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey 25 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey$42.8534 rev

8mo ago
FIRMERST 20 AMP 10 FT 12 Gauge Extension Cord NEMA 6-20P to 6-20R 250 Volt

FIRMERST 20 AMP 10 FT 12 Gauge Extension Cord NEMA 6-20P to 6-20R 250 Volt

FIRMERST$28.94102 rev

10mo ago

Trending

90-day click momentum
Saysurey 50 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey 50 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey$70.094.8★

▲ 223%
EP 25 Ft 12/3 SJTW Outdoor Extension Cord NEMA 6-20 P/R 20A 250V Yellow

EP 25 Ft 12/3 SJTW Outdoor Extension Cord NEMA 6-20 P/R 20A 250V Yellow

EP$30.484.2★

▲ 196%
MECMO 6ft 15 Amp Household to 20 Amp AC Power Adapter Waterproof Cable 12AWG SJTW [4 in 1] NEMA 5-15P to 5-15R 5-20R 6-15R 6-20R T Blade Adaptor 15A 125V to 20A 250V 15Amp to 20Amp Extension Cord

MECMO 6ft 15 Amp Household to 20 Amp AC Power Adapter Waterproof Cable 12AWG SJTW [4 in 1] NEMA 5-15P to 5-15R 5-20R 6-15R 6-20R T Blade Adaptor 15A 125V to 20A 250V 15Amp to 20Amp Extension Cord

MECMO$19.354.8★

▲ 160%
Saysurey 6.6 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey 6.6 ft Nema 6-20 Extension Cord Nema 6-20p Male Plug to 6-20r/6-15r Female Receptacle 20 Amp T-Blade Outlet Extension Power Cord with Waterproof Sockets Heavy Duty 12/3 Awg 250v 5000w

Saysurey$19.504.8★

▲ 148%
EP 6 Ft 12/3 SJTW Outdoor Extension Cord NEMA 6-20 P/R 20A 250V Yellow

EP 6 Ft 12/3 SJTW Outdoor Extension Cord NEMA 6-20 P/R 20A 250V Yellow

EP$12.204.2★

▲ 144%

What buyers say about nema 6-20 extension cord

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

What buyers love

Quality-Overall15%

“The build quality is incredible—it feels sturdy, heavy-duty, and professional right out of the box”

Advertised Vs Actual Product15%

“as advertised”

Durability9%

“feels durable and well made”

Charging7%

“Works to charge my car”

Strength7%

“Feels very sturdy”

Value For Money6%

“Good value in my opinion”

Efficiency5%

“Worked great”

Weight Heavy4%

“Worth it heavy duty”

Ease Of Use4%

“Using it is as simple as it gets”

Material Quality4%

“The cord is heavy duty with good solid plugs on each end”

What buyers complain about

Advertised Vs Actual Product25%

“It did not match description”

Strength13%

“Very low resistence”

Leak-Proof8%

“power leaks are a problem”

Color6%

“The yellow color makes it impossible to trip over”

Top return reasons

Compatibility-Overall34%
Size-Overall16%
Add-Ons/Attachments16%
Socket/Port/Plug12%
Functionality-Overall5%
Advertised Vs Actual Product4%
Connectivity-Overall3%
Value For Money2%
Defective Material/Parts1%
Charging1%

Common questions

Is nema 6-20 extension cord profitable to sell on Amazon United States?
The niche generates $44K/yr across 26 tracked products. 1 of 5 products launched in the last 360 days are still selling. 90-day search growth is +12.6%. Flapen's verdict: Skip it (46/100).
How competitive is the nema 6-20 extension cord niche?
12 brands and 18 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 80% of demand.
What do buyers complain about in nema 6-20 extension cord?
Top complaints mined from reviews: Advertised Vs Actual Product, Strength, Leak-Proof. The return rate is 5.8% — above our launch gate.
When does demand for nema 6-20 extension cord peak?
Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the nema 6-20 extension cord niche?
Listings span $12.20–$73.97; the average listing price is $36.30 (sweet spot $15–$100). The average incumbent carries 270 reviews — the moat a new listing must climb.