3/8 npt tap
Skip itA small market ($56K/yr) — this niche doesn't clear our bar today.
Conversion
Incredible21.3%search→purchase rate — share of searches ending in a sale
Price range
Good$5.95–$35.27cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good$13.75avg listing price — sweet spot $15–$100
Review moat
Good981.5avg incumbent reviews — the moat a new listing must climb
Returns
Good2.5%return rate — above 5% kills the launch gate
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Growth
Okay+4.1%90-day search growth — must beat 0% to launch
Brand share
Bad90%top-5 brand share — brand-locked demand
Competition
Bad74%top-5 click share — a locked-up shelf
Market size
Bad$56K$56K/yr · 19K searches
According to Flapen's Amazon United States niche tracking, 3/8 npt tap is a $56K/yr Amazon United States market (19K searches/yr). The top 5 brands hold 90% of demand. Verdict: Skip it — 42/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
3/8 npt tap market data
- Units sold / yr
- 3K–4K
- avg 250–500/product
- Revenue / yr
- $41K–$55K
- units × avg price
- Conversion rate
- 21.3%
- Avg BSR
- #57
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 64%
- Out of stock
- 2.6%
- Avg brand age
- 55 months
- Avg seller age
- 182 days
Competition & brand share
The top 5 products capture 74% of clicks — a locked-up shelf that new listings rarely crack.Brands
9 rising
Sellers
26
Top-5 brand share
90%
Top 20: 100%
Top-5 click share
74%
Top 20: 100%
Open market
6%
- Drill America37%
- RURITKIT20%
- DECKRKAT16%
- DKIBBITH13%
- LingGan4%
- HORUSDY4%
- Open — no brand owns it (3 brands, 6%)
Demand
Weekly Amazon search volume, last 16 weeks — +4.1% search growth over the last 90 days.Top 3/8 npt tap 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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Drill America - POU3/8NPTW/DRILL 3/8 Carbon Steel NPT Pipe Tap and 37/64 High Speed Steel Drill Bit Set POU Series
Drill America$11.914.6★3,785 rev
RURITKIT 3/8-18 NPT Pipe Tap and 37/64 drill Set Carbon Steel Hand Threading Plumbing NPT Tap Set for Plumbers Mechanics DIY Thread cutting tools
RURITKIT$13.294.4★203 rev
Drill America 3/8-18 NPT Pipe Tap Carbon Steel DWTPT Series
Drill America$5.954.7★3,497 rev
5-Piece NPT Pipe Tap Set Precision Carbon Steel NPT Tap Set for Clean Accurate Threads 3/4 1/2 3/8 1/4 1/8 NPT Tap Perfect for Plumbers Mechanics DIYers with Durable Plastic Case
DECKRKAT$20.814.6★795 rev
DECKRKAT 2-Piece 3/8 NPT Pipe Tap - High Carbon Steel Pipe Threading Tool 18 Threads Per Inch Precision Internal Tap for Plumbers Mechanics & DIY with Protective Case.
DECKRKAT$9.774.6★795 rev
Newest
by launch date
Aceteel 3/8-18 Ti-Coated NPT Tap and 37/64 Drill Bit Set
Aceteel$13.02183 rev
DKIBBITH 2-Piece 3/8 NPT Pipe Tap Set Carbon Steel Hand Threading Tool for Assorted Plumbers Mechanics DIY Thread cutting tools.
DKIBBITH$9.69781 rev
DECKRKAT 2-Piece 3/8 NPT Pipe Tap - High Carbon Steel Pipe Threading Tool 18 Threads Per Inch Precision Internal Tap for Plumbers Mechanics & DIY with Protective Case.
DECKRKAT$9.77795 rev
RURITKIT 3/8-18 NPT Pipe Tap and 37/64 drill Set Carbon Steel Hand Threading Plumbing NPT Tap Set for Plumbers Mechanics DIY Thread cutting tools
RURITKIT$13.29203 rev
3/8-18 NPT Tap Pipe Thread M35 Cobalt Steel Extra Hard Industrial Grade for Heavy-Duty Jobs More Durable & Heat Resistant Perfect for Stainless Steel - Ideal for DIY & Professionals
LingGan$15.2536 rev
Trending
90-day click momentum
QWORK 3/8-18 NPT Pipe Tap Carbon Steel for Clean and Re-thread Damaged or Jam Pipe Threads
QWORK$7.874.7★
DECKRKAT 2-Piece 3/8 NPT Pipe Tap - High Carbon Steel Pipe Threading Tool 18 Threads Per Inch Precision Internal Tap for Plumbers Mechanics & DIY with Protective Case.
DECKRKAT$9.774.6★
Aceteel 3/8-18 Ti-Coated NPT Tap and 37/64 Drill Bit Set
Aceteel$13.024.4★
DKIBBITH 2-Piece 3/8 NPT Pipe Tap Set Carbon Steel Hand Threading Tool for Assorted Plumbers Mechanics DIY Thread cutting tools.
DKIBBITH$9.694.5★
HORUSDY 5-Piece NPT Pipe Tap Kit with Heavy-Duty Storage Case Premium Carbon Steel Threading Tools 1/83/4 Tapered Pipe Taps for Fast Clean & Reliable Plumbing Repairs
HORUSDY$12.664.4★
What buyers say about 3/8 npt tap
What buyers praise and complain about, mined from review topics.What buyers love
“The drill bit is of great quality”
“Worth the money”
“Work better than expected”
“Solid Set”
“They work very good Ease to work with Excellent product durability Sharpness”
“Well built, durable set”
“Worked as designed”
“Good fit”
“Tap worked fine”
What buyers complain about
“Very poor quality control”
“These would damage your part rather than cut threads”
“Tap broke on first use”
“it doesnt nice job”
“The size is seem to be incorrect”
“Look like rejected parts”
“High price ant food”
“the tap would only cut about 1/4 before giving up”
“Tap Incompatible With NPT Threads”
“then it's too dull to use again”
Top return reasons
Common questions
- Is 3/8 npt tap profitable to sell on Amazon United States?
- The niche generates $56K/yr across 14 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +4.1%. Flapen's verdict: Skip it (42/100).
- How competitive is the 3/8 npt tap niche?
- 9 brands and 26 sellers compete. The top 5 products take 74% of clicks and top 5 brands hold 90% of demand.
- What do buyers complain about in 3/8 npt tap?
- Top complaints mined from reviews: Quality-Overall, Sharpness, Durability. The return rate is 2.5%.
- What does it cost to enter the 3/8 npt tap niche?
- Listings span $5.95–$35.27; the average listing price is $13.75 (sweet spot $15–$100). The average incumbent carries 982 reviews — the moat a new listing must climb.