machinist stone
Skip itA small market ($43K/yr) — this niche doesn't clear our bar today.
Avg price
Incredible$31.48avg listing price — sweet spot $15–$100
Returns
Great1.2%return rate — above 5% kills the launch gate
Price range
Good$8.05–$124.01cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good639.93avg incumbent reviews — the moat a new listing must climb
Competition
Good49%top-5 click share — leaders hold, buyers still browse
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Conversion
Okay3.0%search→purchase rate — share of searches ending in a sale
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Growth
Bad-13.4%90-day search growth — must beat 0% to launch
Market size
Bad$43K$43K/yr · 45K searches
According to Flapen's Amazon United States niche tracking, machinist stone is a $43K/yr Amazon United States market (45K searches/yr). The top 5 brands hold 88% of demand. Verdict: Skip it — 45/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
machinist stone market data
- Units sold / yr
- 2K–2K
- avg 0–100/product
- Revenue / yr
- $47K–$63K
- units × avg price
- Conversion rate
- 3.0%
- Avg BSR
- #367
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 62%
- Out of stock
- 0.0%
- Avg brand age
- 71 months
- Avg seller age
- 182 days
Competition & brand share
The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.Brands
13 rising
Sellers
114
Top-5 brand share
88%
Top 20: 100%
Top-5 click share
49%
Top 20: 89%
Open market
10%
- Norton73%
- Whitby Abrasives6%
- CBRIGHT4%
- Raneped4%
- Sharp Pebble2%
- LWCUSNJ2%
- Open — no brand owns it (7 brands, 10%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -13.4% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Top machinist stone search terms
- machinist stone11K/yr
- norton sharpening stone12K/yr
- india stone7K/yr
- oil stone6K/yr
- norton stone4K/yr
- norton india stone3K/yr
- oil stones for sharpening knives2K/yr
Top machinist stone 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
Norton Combination Grit Abrasive Benchstone Aluminum Oxide 6 Length x 2 Width x 1 Height
Norton$35.024.8★421 rev
Norton Knife Sharpener Combination Grit Oil Stone - Sharpening Stone with Fine/Coarse Combination great for home tools kitchen knives hunting knives and many more
Norton$35.684.7★982 rev
Norton Crystolon Abrasive Machine Knife Stone Silicon Carbide 4 Diameter x 1-1/2 Thickness Grit Coarse/Fine (Pack of 1)
Norton$54.604.3★93 rev
Norton India Aluminum Oxide Combination Grit Benchstone 4 x 1-3/4 x 5/8 Inch India Combination Grit Benchstone IB134 Coarse/Fine Grit
Norton$24.853.8★10 rev
4 Dual Grit Axe/Hatchet Silicon Carbide Sharpener Multipurpose Sharpening Stone Grinding Wheel
Whitby Abrasives$19.374.6★318 rev
Newest
by launch date
Raneped 4 Dual Grit Silicon Carbide Axe Sharpener
Raneped$18.777 rev
Sharpening Stone Set 8pcs Rectangular Sanding Sticks Knife White Corundum Oil Stone for Knife Most DIY Bladed&Cutting Tool-120# 180# 240# 320# 600# 800# 1000# 1200#(5.91x0.47x0.47inch)
CBRIGHT$15.5123 rev
LWCUSNJ 8 pcs Rectangular Shaped Sharpening Stone Sticks Set 5.92inch Green Silicon Carbide Stones Grit Sizes 80#-3000# for Models Metal & Knife Cutting Tools
LWCUSNJ$14.1469 rev
HiramWare Knife Sharpening Stone with Non-slip Rubber Base 400/1000 Grit Premium Whetstone Double-Sided Knife Sharpener for Kitchen Waterstone for Honing Blades Manually
HiramWare$9.651,027 rev
MASSIVE BEADS Indian Agate - Stone of Peaceful - Handmade Yoga Stretch Elastic Bracelet Natural Stone Crystal Healing Power Energy Gifts for Unisex Adult 8mm
MASSIVE BEADS$9.9258 rev
Trending
90-day click momentumMASSIVE BEADS Indian Agate - Stone of Peaceful - Handmade Yoga Stretch Elastic Bracelet Natural Stone Crystal Healing Power Energy Gifts for Unisex Adult 8mm
MASSIVE BEADS$9.924.2★
Raneped 4 Dual Grit Silicon Carbide Axe Sharpener
Raneped$18.774.1★
Sharpening Stone Set 8pcs Rectangular Sanding Sticks Knife White Corundum Oil Stone for Knife Most DIY Bladed&Cutting Tool-120# 180# 240# 320# 600# 800# 1000# 1200#(5.91x0.47x0.47inch)
CBRIGHT$15.514.6★
Sharp Pebble Flattening Stone - Dual Grit 120/320 Whetstone Flattener
Sharp Pebble$28.544.3★
Norton India Aluminum Oxide Combination Grit Benchstone 4 x 1-3/4 x 5/8 Inch India Combination Grit Benchstone IB134 Coarse/Fine Grit
Norton$24.853.8★
What buyers say about machinist stone
What buyers praise and complain about, mined from review topics.What buyers love
“well-made product”
“Always keep sharp”
“Great Deal”
“As advertised”
“Easy to use”
“Works well”
“Great durability”
“boning knives turned out superb”
“it's large enough to get the biggest knives”
“Is very good project”
What buyers complain about
“Not great quality”
“surface, which is impossible to use for sharpening”
“I do wish there were better instructions in the box”
“The bases being wooden probably isn't the best material to be used for stones that absorb water”
“expected it to break anyways”
“although I'm not great at using it quite yet”
“Larger than expected”
“Convenient size little stones for certain jobs, however they are extremely brittle and easily break”
“$30 price seemed pretty cheap”
“The angle guide dose not work well”
Top return reasons
Common questions
- Is machinist stone profitable to sell on Amazon United States?
- The niche generates $43K/yr across 29 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -13.4%. Flapen's verdict: Skip it (45/100).
- How competitive is the machinist stone niche?
- 13 brands and 114 sellers compete. The top 5 products take 49% of clicks and top 5 brands hold 88% of demand.
- What do buyers complain about in machinist stone?
- Top complaints mined from reviews: Quality-Overall, Sharpness, Instructions/User Manual/Troubleshooting. The return rate is 1.2%.
- When does demand for machinist stone peak?
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- What does it cost to enter the machinist stone niche?
- Listings span $8.05–$124.01; the average listing price is $31.48 (sweet spot $15–$100). The average incumbent carries 640 reviews — the moat a new listing must climb.