Prop Wrench
Worth a lookShows a thin review moat (102 avg reviews), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Review moat
Great102avg incumbent reviews — the moat a new listing must climb
Conversion
Great11.8%search→purchase rate — share of searches ending in a sale
Growth
Great+91.6%90-day search growth — must beat 0% to launch
Returns
Great1.5%return rate — above 5% kills the launch gate
Avg price
Great$16.71avg listing price — sweet spot $15–$100
Price range
Great$12.77–$21.96cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Brand share
Okay85%top-5 brand share — brands hold most of the demand
Competition
Bad72%top-5 click share — a locked-up shelf
Market size
Bad$59K$59K/yr · 30K searches
Is prop wrench profitable on Amazon?
According to Flapen's Amazon United States niche tracking, prop wrench is a $59K/yr Amazon United States market (30K searches/yr). The top 5 brands hold 85% of demand. Demand peaks in May–Jun–Jul–Aug. Verdict: Worth a look — 59/100.
Data updated Jul 24, 2026 · scored weekly · How we score niches
prop wrench market size & sales
Units sold, revenue, conversion and listing quality across the tracked shelf.- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $50K–$67K
- units × avg price
- Conversion rate
- 11.8%
- Avg BSR
- #228
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 92%
- Out of stock
- 1.1%
- Avg brand age
- 64 months
- Avg seller age
- 183 days
Competition: brands, sellers & click share
The top 5 products capture 72% of clicks — a locked-up shelf that new listings rarely crack.Brands
8 flat
Sellers
65
Top-5 brand share
85%
Top 20: 100%
Top-5 click share
72%
Top 20: 100%
Open market
8%
- Bonbo34%
- Yoursme18%
- FullMayPro14%
- attwood10%
- Camoo9%
- Sporthfish6%
- Open — no brand owns it (2 brands, 8%)
prop wrench demand & seasonality
Weekly Amazon search volume, last 104 weeks — +91.6% search growth over the last 90 days.Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 4.3×
Top prop wrench search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.- prop wrench13K/yr
- prop wrench mercury7K/yr
- boat prop wrench3K/yr
- propeller wrench3K/yr
- mercury prop wrench3K/yr
Top prop wrench products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 13 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
For Marine Boat Prop 1-1/16 Polymer Propeller Wrench 91-859046Q4 & PMPS-1-DP Prop Stop Block - Works for Mercury Mercruiser Alpha Fits all Outboard & Stern Drive Applications (Light-Weight Yellow)
Bonbo$19.834.8★49 rev
1-1/16 Boat Prop Wrench & PMPS-1-DP Prop Stop Block Kit 91-859046Q4 Polymer Propeller Wrench - Works for Mercury Mercruiser Alpha Fits All Outboard & Stern Drive Applications Light-Weight Yellow
Yoursme$20.244.6★50 rev
Attwood 11370-7 Universal Prop Wrench Kit with Multiple Sockets
attwood$16.794.3★420 rev
Camoo Polymer Propeller Wrench 1-1/16 Nut Wrench for Mercury OMC Mercruiser Alpha Johnson Evinrude 40HP & UP Replaces 91-859046Q4 Light Weight Yellow Rustproof Plastic (27mm)
Camoo$13.504.4★330 rev
Sporthfish Prop Wrench 91-859046Q4 Propeller Wrench for 1 1/16 Inches Nuts for Mercury Mercruiser Alpha Outboards Stern Drives Pontoon Sport and Fishing Boat 27mm Yellow Plastic Rustroof Ergonomics
Sporthfish$13.453.5★4 rev
Newest
by launch date
FullMayPro Floating Polymer Propeller Wrench 1-1/16 Marine Boat Nut Propeller Wrench for Mercury/OMC/Mercruiser/Alpha Replaces 91-859046Q4 Light Weight Rustproof Plastic Yellow(27mm)
FullMayPro$12.800 rev
FullMayPro Polymer Propeller Wrench 1-1/16 Marine Boat Nut Propeller Wrench for Mercury/OMC/Mercruiser/Alpha Replaces 91-859046Q4 Light Weight Rustproof Plastic Red(27mm)
FullMayPro$12.7712 rev
FASWORX Floating Propeller Wrench 1-1/16 (27mm) - Fits MerCruiser Alpha/Bravo Yamaha Honda Suzuki Volvo Penta - Replaces 91-859046Q4 859046T4 Sierra 18-4459 - Yellow
FASWORX$13.966 rev
Floating Marine Boat Prop 1-1/16 Polymer Propeller Wrench & Prop Stop Propeller Stop Fit Mercury/Mercruiser/OMC for All Outboard & Stern Drive Applications Light-Weight Rustproof Plastic Yellow
FullMayPro$19.7136 rev
Polymer Propeller Wrench 1-1/16 Nut Wrench & Prop Stop Propeller Stop Fit Mercury/Mercruiser/OMC Marine Boat Prop for All Outboard & Stern Drive Applications Light-Weight Rustproof Plastic Red(27mm)
FullMayPro$19.6436 rev
Trending
90-day click momentumFullMayPro Floating Polymer Propeller Wrench 1-1/16 Marine Boat Nut Propeller Wrench for Mercury/OMC/Mercruiser/Alpha Replaces 91-859046Q4 Light Weight Rustproof Plastic Yellow(27mm)
FullMayPro$12.800.0★
FullMayPro Polymer Propeller Wrench 1-1/16 Marine Boat Nut Propeller Wrench for Mercury/OMC/Mercruiser/Alpha Replaces 91-859046Q4 Light Weight Rustproof Plastic Red(27mm)
FullMayPro$12.774.8★
FASWORX Floating Propeller Wrench 1-1/16 (27mm) - Fits MerCruiser Alpha/Bravo Yamaha Honda Suzuki Volvo Penta - Replaces 91-859046Q4 859046T4 Sierra 18-4459 - Yellow
FASWORX$13.965.0★
Floating Marine Boat Prop 1-1/16 Polymer Propeller Wrench & Prop Stop Propeller Stop Fit Mercury/Mercruiser/OMC for All Outboard & Stern Drive Applications Light-Weight Rustproof Plastic Yellow
FullMayPro$19.714.5★
Sporthfish Prop Wrench 91-859046Q4 Propeller Wrench for 1 1/16 Inches Nuts for Mercury Mercruiser Alpha Outboards Stern Drives Pontoon Sport and Fishing Boat 27mm Yellow Plastic Rustroof Ergonomics
Sporthfish$13.453.5★
What reviews say buyers love and hate about prop wrench
What buyers praise and complain about, mined from review topics.What buyers love
“great value”
“Fits perfect”
“Easy to use”
“As advertised”
“It provides a lightweight”
“Build quality feels solid”
“you never have to worry about rust”
“great grip”
“its brightly colored”
“The quality of the plastic seems to be very good”
What buyers complain about
“Doesn't fit”
“Cheap”
“Cheap material deformed on first use”
“Will not work on all outboards too big for Yamaha 70hp way too big need to change the ad”
“Stripped on first use”
“did not really work for me at all a flat head screw driver works a lot better”
“Does not work on my 50 hp mercury 4 stroke EFI”
“Total waste of money”
“It bent when I tried to use it”
“only to find it had rusted very badly in about a year”
Top return reasons
Common prop wrench questions
- Is prop wrench profitable to sell on Amazon United States?
- The niche generates $59K/yr across 13 tracked products. 2 of 9 products launched in the last 360 days are still selling. 90-day search growth is +91.6%. Flapen's verdict: Worth a look (59/100).
- How competitive is the prop wrench niche?
- 8 brands and 65 sellers compete. The top 5 products take 72% of clicks and top 5 brands hold 85% of demand.
- What do buyers complain about in prop wrench?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Material Quality. The return rate is 1.5%.
- When does demand for prop wrench peak?
- Demand peaks in May–Jun–Jul–Aug; the busiest month runs 4.3× the quietest.
- What does it cost to enter the prop wrench niche?
- Listings span $12.77–$21.96; the average listing price is $16.71 (sweet spot $15–$100). The average incumbent carries 102 reviews — the moat a new listing must climb.