heavy duty combination lock
Worth a lookShows searches that convert (8.9% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Conversion
Great8.9%search→purchase rate — share of searches ending in a sale
Price range
Great$6.20–$57.88cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$17.14avg listing price — sweet spot $15–$100
Competition
Good40%top-5 click share — leaders hold, buyers still browse
Returns
Good2.4%return rate — above 5% kills the launch gate
Market size
Okay$273K$273K/yr · 179K searches
Quality gap
Good4.5★avg incumbent rating — lower means beatable quality
Growth
Okay+15.8%90-day search growth — must beat 0% to launch
Review moat
Bad6,894.03avg incumbent reviews — the moat a new listing must climb
Brand share
Bad91%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, heavy duty combination lock is a $273K/yr Amazon United States market (179K searches/yr). The top 5 brands hold 91% of demand. Demand peaks in Aug. Verdict: Worth a look — 57/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
heavy duty combination lock market data
- Units sold / yr
- 15K–20K
- avg 250–500/product
- Revenue / yr
- $257K–$343K
- units × avg price
- Conversion rate
- 8.9%
- Avg BSR
- #27
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 97%
- Out of stock
- 0.0%
- Avg brand age
- 48 months
- Avg seller age
- 158 days
Competition & brand share
The top 5 products take 40% of clicks — established leaders, but buyers still shop beyond them.Brands
12 falling
Sellers
150
Top-5 brand share
91%
Top 20: 100%
Top-5 click share
40%
Top 20: 86%
Open market
7%
- Master Lock68%
- Diyife12%
- Puroma6%
- disecu3%
- NovLock3%
- AIHYTU2%
- Open — no brand owns it (6 brands, 7%)
Demand & seasonality
Weekly Amazon search volume, last 103 weeks — +15.8% search growth over the last 90 days.Peak months: Aug · busiest ÷ quietest = 1.8×
Top heavy duty combination lock search terms
- master combination lock37K/yr
- outdoor combination lock weatherproof25K/yr
- heavy duty combination lock20K/yr
- master combo lock12K/yr
- outdoor combo lock9K/yr
- outdoor combo lock weatherproof8K/yr
- weatherproof combination lock8K/yr
- combination lock for storage unit6K/yr
- shed locks with code6K/yr
- outdoor combination padlock5K/yr
Top heavy duty combination lock 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 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Master Lock Combination Lock Heavy Duty Weatherproof Padlock Resettable for Outdoor Use Brass Finish M175XDLF
Master Lock$21.954.4★9,089 rev
![Diyife Heavy Duty Combination Padlock Large Outdoor Padlock [One-Touch Unlocking] High Security Weatherproof Design of Hidden Password Suitable for Locker Home School Garage Gate Garden](https://m.media-amazon.com/images/I/41FpD5aYVaL.jpg)
Diyife Heavy Duty Combination Padlock Large Outdoor Padlock [One-Touch Unlocking] High Security Weatherproof Design of Hidden Password Suitable for Locker Home School Garage Gate Garden
Diyife$14.024.7★1,490 rev
Master Lock Brass Combination Padlock for Indoor and Outdoor use with Resettable Combination for Gym Locker Gate Fence or Shed Lock 175D
Master Lock$15.974.5★4,577 rev
Master Lock Brass ProSeries Set Your Own Combination Lock Outdoor Heavy-Duty Padlock for Construction Sites Gates Fences 2-1/4 Wide 1175LHSS
Master Lock$20.534.4★836 rev
Master Lock Brass Combination Lock Gate Lock for Outdoor Fence or Shed Customizable Combination Padlock with Extended 2-1/4-Inch-Long Shackle 2 Pack 175LHEC2
Master Lock$35.044.4★3,400 rev
Newest
by launch date
NOVLOCK Combination Lock for Outdoor & Indoor | Heavy Duty Weatherproof 4-Digit Security | Padlock for Lockers Gates Fences Sheds Storage | 1-Pack Black
NovLock$11.92648 rev
Outdoor Combination Lock Heavy Duty Large Weatherproof Padlock with Code for Gates Fences Sheds Lockers Cabinets Storage Units 1-Pack Black
NovLock$13.83359 rev
Master Lock Gold Combination Lock Heavy Duty Weather Resistant Padlock Resettable Combination Lock for Outdoor Use 1.2 x 2 x 3.87 inches 2 Pack M175LFEC2
Master Lock$38.399,089 rev
Master Lock Brass Combination Lock Gate Lock for Outdoor Fence or Shed Customizable Combination Padlock with Extended 2-1/4-Inch-Long Shackle 2 Pack 175LHEC2
Master Lock$35.043,400 rev
Master Lock Black Combination Padlock Set Your Own Combo Lock Weather Resistant Indoor and Outdoor Padlocks with Code for Gym Locker Gate Shed 2 Pack 178EC2
Master Lock$24.05678 rev
Trending
90-day click momentum
Amazon Basics 4-Digit Combination Lock Black 2-Pack
Amazon Basics$8.264.4★
Outdoor Combination Lock Heavy Duty Large Weatherproof Padlock with Code for Gates Fences Sheds Lockers Cabinets Storage Units 1-Pack Black
NovLock$13.834.8★
Master Lock Black Combination Padlock Set Your Own Combo Lock Weather Resistant Indoor and Outdoor Padlock with Code for Gym Locker Gate Shed 178D
Master Lock$15.804.6★
Combination Lock Resettable 4 Digit Padlock with Combination AIHYTU Waterproof and Heavy Duty Combination Padlock Outdoor for School Gym Locker Fence Gate Toolbox Employee Hasp Locker 2 Pack
AIHYTU$7.314.5★
Master Lock Gold Combination Padlock Gate Lock for Outdoor Fence or Shed Small Lock with Customizable Code for Indoor or Outdoor Storage 4 Pack 175EC4
Master Lock$57.884.5★
What buyers say about heavy duty combination lock
What buyers praise and complain about, mined from review topics.What buyers love
“locks work nicely”
“EASY TO USE”
“Excellent quality”
“Excellent Value”
“Works great once it setup”
“As expected”
“Sturdy and Strong”
“Worked for me”
“Fits great and works well”
“Durable and simple easy to use”
What buyers complain about
“Lock is defective”
“Cheap garbage”
“Broke quickly”
“Not as advertised”
“Difficult to operate”
“Suddenly stopped working with no warning”
“Ehhh kinda cheap”
“It's pretty small”
“Rusting”
“Not strong”
Top return reasons
Common questions
- Is heavy duty combination lock profitable to sell on Amazon United States?
- The niche generates $273K/yr across 34 tracked products. 90-day search growth is +15.8%. Flapen's verdict: Worth a look (57/100).
- How competitive is the heavy duty combination lock niche?
- 12 brands and 150 sellers compete. The top 5 products take 40% of clicks and top 5 brands hold 91% of demand.
- What do buyers complain about in heavy duty combination lock?
- Top complaints mined from reviews: Locking Mechanism, Quality-Overall, Durability. The return rate is 2.4%.
- When does demand for heavy duty combination lock peak?
- Demand peaks in Aug; the busiest month runs 1.8× the quietest.
- What does it cost to enter the heavy duty combination lock niche?
- Listings span $6.20–$57.88; the average listing price is $17.14 (sweet spot $15–$100). The average incumbent carries 6,894 reviews — the moat a new listing must climb.