Is oil filter adapter 1/2-28 profitable to sell on Amazon United States?

The niche generates $47K/yr across 12 tracked products. 1 of 5 products launched in the last 360 days are still selling. 90-day search growth is -54.3%. Flapen's verdict: Skip it (41/100).

How competitive is the oil filter adapter 1/2-28 niche?

11 brands and 12 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 82% of demand.

What do buyers complain about in oil filter adapter 1/2-28?

Top complaints mined from reviews: Quality-Overall, Size-Overall, Thickness. The return rate is 1.0%.

When does demand for oil filter adapter 1/2-28 peak?

Demand peaks in Jan–Feb–Dec; the busiest month runs 4.2× the quietest.

What does it cost to enter the oil filter adapter 1/2-28 niche?

Listings span $8.73–$20.00; the average listing price is $12.51 (sweet spot $15–$100). The average incumbent carries 89 reviews — the moat a new listing must climb.

oil filter adapter 1/2-28

Skip it

Soft demand (-54.3% this quarter) — this niche doesn't clear our bar today.

Conversion

Incredible15.4%

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

Review moat

Incredible88.92

avg incumbent reviews — the moat a new listing must climb

Returns

Great1.0%

return rate — above 5% kills the launch gate

Avg price

Good$12.51

avg listing price — sweet spot $15–$100

Price range

Okay$8.73–$20.00

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Okay82%

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

Competition

Bad77%

top-5 click share — a locked-up shelf

Market size

Bad$47K

$47K/yr · 24K searches

Growth

Bad-54.3%

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

According to Flapen's Amazon United States niche tracking, oil filter adapter 1/2-28 is a $47K/yr Amazon United States market (24K searches/yr). The top 5 brands hold 82% of demand. Demand peaks in Jan–Feb–Dec. Verdict: Skip it — 41/100.

Data updated Jul 11, 2026 · scored weekly · How we score niches

oil filter adapter 1/2-28 market data

Units sold / yr: 3K–4K; avg 250–500/product
Revenue / yr: $38K–$50K; units × avg price
Conversion rate: 15.4%
Avg BSR: #1,251
Page quality: 0%
Prime: 100%
Sponsored: 92%
Out of stock: 1.3%
Avg brand age: 17 months
Avg seller age: 239 days

Competition & brand share

The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.

Brands

11 rising

Sellers

Top-5 brand share

82%

Top 20: 100%

Top-5 click share

77%

Top 20: 100%

Open market

14%

Gugaguga50%
Jingzan12%
Axyuada9%
Tllsdss6%
IHOTDER5%
HHLZDHH4%
Open — no brand owns it (5 brands, 14%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -54.3% search growth over the last 90 days.

Peak months: Jan, Feb, Dec · busiest ÷ quietest = 4.2×

Open Trend

Top oil filter adapter 1/2-28 search terms

1/2x28 to 3/4x16 thread adapter13K/yr -58.6%11.1% conv.
1/2 28 to 3/4 16 adapter8K/yr -49.4%7.8% conv.
1/2-28 to 3/4-16 thread adapter4K/yr -48.7%9.7% conv.

All search terms

Top oil filter adapter 1/2-28 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★)

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

Top sellers

by 90-day click share

2 Pack Thread Adapters and Washers 1/2x28-3/4x16 Black

Gugaguga$11.374.6★592 rev

Gugaguga 2 Pcs Thread Adapters and Washers 1/2x28-3/4x16 Black

Gugaguga$12.934.5★116 rev

4-Pack 304 Stainless Steel 1/2-28 Female to 3/4-16 Male Thread Adapter Heavy-Duty Thread Reducer Converter with Rubber Washers & O-Rings Precision CNC Thread Adapters

Jingzan$16.944.7★5 rev

3 Pack Thread Protector and Washers 1/2 * 28-3/4 * 16 Black

Axyuada$10.434.5★55 rev

6 Pack Steel Thread Protector & Washers 1/2x28 to 3/4x16 Black Set Kit

Tllsdss$20.004.4★27 rev

Newest

by launch date

Senlinyu Thread Adapter and Rubber Washer 1/2-28 to 3/4-16 Thread Protector Fittings for Fuel Cooling Brake System Automotive Accessories for Car Truck SUV (2PCS -1/2-28 to 3/4-16 Thread Protector)

Senlinyu$8.7318 rev

4mo ago

HNYYZL Thread Adapters with Washers 1/2 * 28-3/4 * 16

HNYYZL$14.031 rev

4mo ago

6 Pack Steel Thread Protector & Washers 1/2x28 to 3/4x16 Black Set Kit

Tllsdss$20.0027 rev

6mo ago

4-Pack 304 Stainless Steel 1/2-28 Female to 3/4-16 Male Thread Adapter Heavy-Duty Thread Reducer Converter with Rubber Washers & O-Rings Precision CNC Thread Adapters

Jingzan$16.945 rev

7mo ago

SPEEDWOX 2PCS Oil Filter Adapter Thread Adapter 1/2-28 Female to 3/4-16 13/16-16 3/4 NPT Male Hose Reducer Fuel Line Fitting Connector with O-ring and Tape for Oil Coolers Fuel Tanks and Pumps

SPEEDWOX$8.9113 rev

9mo ago

What buyers say about oil filter adapter 1/2-28

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

What buyers love

Size-Overall24%

“true to size”

Advertised Vs Actual Product23%

“Just as described”

Quality-Overall15%

“Good quality adapters for project”

Value For Money10%

“Great value”

Filtration5%

“Adding the filter helps with constant flow”

Efficiency5%

“Works great”

Ease Of Cleaning5%

“Inside and outside threads are clean”

Strength3%

“Strong”

Fun/Entertainment Experience2%

“my children have enjoyed playing with them”

Design-Overall2%

“Such aesthetics are of no concern for my purpose”

What buyers complain about

Quality-Overall31%

“Junk”

Size-Overall31%

“Does not fit”

Thickness6%

“being thin on the edges”

Weight Heavy6%

“Heavy”

Functionality-Overall6%

Top return reasons

Size-Overall58%

Compatibility-Overall8%

Defective Material/Parts7%

Advertised Vs Actual Product6%

Quality-Overall5%

Functionality-Overall5%

Assembly/Installation4%

Value For Money3%

Shape/Style1%

Filtration1%

Common questions

Is oil filter adapter 1/2-28 profitable to sell on Amazon United States?: The niche generates $47K/yr across 12 tracked products. 1 of 5 products launched in the last 360 days are still selling. 90-day search growth is -54.3%. Flapen's verdict: Skip it (41/100).
How competitive is the oil filter adapter 1/2-28 niche?: 11 brands and 12 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 82% of demand.
What do buyers complain about in oil filter adapter 1/2-28?: Top complaints mined from reviews: Quality-Overall, Size-Overall, Thickness. The return rate is 1.0%.
When does demand for oil filter adapter 1/2-28 peak?: Demand peaks in Jan–Feb–Dec; the busiest month runs 4.2× the quietest.
What does it cost to enter the oil filter adapter 1/2-28 niche?: Listings span $8.73–$20.00; the average listing price is $12.51 (sweet spot $15–$100). The average incumbent carries 89 reviews — the moat a new listing must climb.