---
title: "Machinist Stone — $43K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/machinist-stone"
last_updated: "2026-08-09T03:39:50.873Z"
locale: en
meta:
description: "Niche score 45/100 · $43K/yr market · 45K searches/yr · $31.48 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 45/100 · $43K/yr market · 45K searches/yr · $31.48 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Machinist Stone — $43K/yr Amazon US Niche (2026) - Flapen"
---
# **machinist stone**
**Skip it**
A small market ($43K/yr) — this niche doesn't clear our bar today.
Market size 11Growth 18Conversion 38Competition 60Returns 91Price range 73Avg price 95Brand share 28Review moat 72Quality gap 43
**Avg price**
**Incredible****$31.48**
avg listing price — sweet spot $15–$100
**Returns**
**Great****1.2%**
return rate — above 5% kills the launch gate
**Price range**
**Good****$8.05–$124.01**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****639.93**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Good****49%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Conversion**
**Okay****3.0%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Okay****88%**
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 ~~](https://flapen.com/research/methodology)
## **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.
1K800Holiday '24Prime Day '25Holiday '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/machinist-stone/trend)
## **Top machinist stone search terms**
- **machinist stone**11K/yr-0.3%4.3% conv. - **norton sharpening stone**12K/yr-21.2%2.8% conv. - **india stone**7K/yr-18.1%2.8% conv. - **oil stone**6K/yr-12.6%1.6% conv. - **norton stone**4K/yr-3.4%3.8% conv. - **norton india stone**3K/yr-30.3%2.3% conv. - **oil stones for sharpening knives**2K/yr-36.2%0.0% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/machinist-stone/search-terms)
## **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.
0%5%$2K10%$4K15%$6K20%$9K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Norton Combination Grit Abrasive Benchstone Aluminum Oxide 6 Length x 2 Width x 1 Height**Norton**$35.02**4.8★421 rev](https://www.amazon.com/dp/B0006NDPLW) [2**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**$35.68**4.7★982 rev](https://www.amazon.com/dp/B000XK5ZDY) [3**Norton Crystolon Abrasive Machine Knife Stone Silicon Carbide 4 Diameter x 1-1/2 Thickness Grit Coarse/Fine (Pack of 1)**Norton**$54.60**4.3★93 rev](https://www.amazon.com/dp/B000RU8TQA) [4**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**$24.85**3.8★10 rev](https://www.amazon.com/dp/B000WTMDLS) [5**4 Dual Grit Axe/Hatchet Silicon Carbide Sharpener Multipurpose Sharpening Stone Grinding Wheel**Whitby Abrasives**$19.37**4.6★318 rev](https://www.amazon.com/dp/B08P3WL2WT)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Raneped 4 Dual Grit Silicon Carbide Axe Sharpener**Raneped**$18.77**7 rev6mo ago](https://www.amazon.com/dp/B0GD5YYKVS) [**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**$15.51**23 rev1y ago](https://www.amazon.com/dp/B0FJ8F24L5) [**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**$14.14**69 rev1y ago](https://www.amazon.com/dp/B0DR88D7QD) [**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**$9.65**1,027 rev2y ago](https://www.amazon.com/dp/B0CWTP79SP) [**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**$9.92**58 rev2y ago](https://www.amazon.com/dp/B0CNW3PPLN)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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**$9.92**4.2★**▲ 312%**](https://www.amazon.com/dp/B0CNW3PPLN) [**Raneped 4 Dual Grit Silicon Carbide Axe Sharpener**Raneped**$18.77**4.1★**▲ 225%**](https://www.amazon.com/dp/B0GD5YYKVS) [**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**$15.51**4.6★**▲ 79%**](https://www.amazon.com/dp/B0FJ8F24L5) [**Sharp Pebble Flattening Stone - Dual Grit 120/320 Whetstone Flattener**Sharp Pebble**$28.54**4.3★**▲ 68%**](https://www.amazon.com/dp/B082YH4HTZ) [**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**$24.85**3.8★**▲ 61%**](https://www.amazon.com/dp/B000WTMDLS)
**~~View all trending →~~**
## **What buyers say about machinist stone**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**24%
*“well-made product”*
**Sharpness**23%
*“Always keep sharp”*
**Value For Money**17%
*“Great Deal”*
**Advertised Vs Actual Product**9%
*“As advertised”*
**Ease Of Use**7%
*“Easy to use”*
**Efficiency**3%
*“Works well”*
**Durability**2%
*“Great durability”*
**Precision Of Cut**2%
*“boning knives turned out superb”*
**Size-Overall**1%
*“it's large enough to get the biggest knives”*
**Design-Overall**1%
*“Is very good project”*
### **What buyers complain about **
**Quality-Overall**28%
*“Not great quality”*
**Sharpness**8%
*“surface, which is impossible to use for sharpening”*
**Instructions/User Manual/Troubleshooting**7%
*“I do wish there were better instructions in the box”*
**Material Quality**6%
*“The bases being wooden probably isn't the best material to be used for stones that absorb water”*
**Durability**5%
*“expected it to break anyways”*
**Ease Of Use**4%
*“although I'm not great at using it quite yet”*
**Size-Overall**4%
*“Larger than expected”*
**Strength**3%
*“Convenient size little stones for certain jobs, however they are extremely brittle and easily break”*
**Value For Money**3%
*“$30 price seemed pretty cheap”*
**Functionality-Overall**3%
*“The angle guide dose not work well”*
### **Top return reasons **
**Sharpness**35%
**Size-Overall**14%
**Advertised Vs Actual Product**9%
**Defective Material/Parts**8%
**Quality-Overall**6%
**Functionality-Overall**5%
**Value For Money**5%
**Material Quality**3%
**Weight Heavy**3%
**Instructions/User Manual/Troubleshooting**2%
## **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.
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