The Atoma 400 Diamond Plate fills the gap between heavy repair work and true edge refinement. If the 140 grit is your bulldozer, the 400 is your precision grading tool. It offers controlled stock removal while still cutting quickly, making it an excellent choice for bevel setting, light chip repair, and transitioning into mid-grit stone work. The diamond abrasive is arranged in a dot matrix pattern on a stainless steel sheet and mounted to a rigid aluminum base, ensuring long-term flatness and consistent performance.
The 400 grit plate is aggressive enough to shape edges efficiently, yet refined enough to leave a clean scratch pattern that makes progression to 800 or 1000 grit stones seamless. Many sharpeners also use the 400 as a maintenance flattening plate for water stones when less material removal is required than with a 140. The spaced dot design helps clear swarf and reduces suction, allowing the plate to glide smoothly across stones. Like other plates in the series, the diamond sheet can be replaced when worn, extending the useful life of the tool and protecting your investment.
Care Instructions: Rinse thoroughly after use and allow to dry completely. Use moderate pressure and let the diamonds cut efficiently. Avoid dropping or striking the plate to preserve flatness.
Brand: Atoma Grit: 400 Type: Diamond Sharpening Plate Construction: Diamond abrasive on stainless sheet with aluminum base Use: Bevel setting, light repair, stone flattening Length: 210 mm Width: 75 mm Thickness: 10 mm
The 400 grit plate is aggressive enough to shape edges efficiently, yet refined enough to leave a clean scratch pattern that makes progression to 800 or 1000 grit stones seamless. Many sharpeners also use the 400 as a maintenance flattening plate for water stones when less material removal is required than with a 140. The spaced dot design helps clear swarf and reduces suction, allowing the plate to glide smoothly across stones. Like other plates in the series, the diamond sheet can be replaced when worn, extending the useful life of the tool and protecting your investment.
Care Instructions: Rinse thoroughly after use and allow to dry completely. Use moderate pressure and let the diamonds cut efficiently. Avoid dropping or striking the plate to preserve flatness.
Reviews
13 review(s) WRITE A REVIEW (Reviews are subject to approval) Fantastic Stone Flatener No SubstitutePosted By: Dr. Matt
32 people found this review helpful
This plate is my most used piece of equipment in my entire sharpening arsenal. I use it on straight razors to set bevels, geometry corrections and chip/gouge removal. I use it for knives to re-establish the edge (raise a burr), I also use it to lap all of my stones prior to every use.
I've been at this at least 10 years and I just ordered my 5th replacement plate. I've tried other brands and just not close.
This plate is the shitte!!!
32 people found this review helpful
This plate is my most used piece of equipment in my entire sharpening arsenal. I use it on straight razors to set bevels, geometry corrections and chip/gouge removal. I use it for knives to re-establish the edge (raise a burr), I also use it to lap all of my stones prior to every use.
I've been at this at least 10 years and I just ordered my 5th replacement plate. I've tried other brands and just not close.
This plate is the shitte!!!
Amazing Atoma 400/1200 Love Atoma 400!! Atoma 400Posted By: Ray Edling - verified customer
7 people found this review helpful
The Atoma 400 flattening plate arrived quickly and in perfect condition. Used it first to flatten an old (my grandfather's) water stone. It was soon perfectly flat with a fine, satiny surface. Beautiful.
7 people found this review helpful
The Atoma 400 flattening plate arrived quickly and in perfect condition. Used it first to flatten an old (my grandfather's) water stone. It was soon perfectly flat with a fine, satiny surface. Beautiful.
Shapton Glass sharpening stone Excellent Lapping Plate Works great for flattening stones and re-profiling knives Great sharpening productPosted By: Joon - verified customer
8 people found this review helpful
I'm a big fan of this Atoma plate. Had a Diaplate prior that was good, but I like that these have replaceable grit plates so when it wears out, I can replace just the top surface and be ready to roll again.
8 people found this review helpful
I'm a big fan of this Atoma plate. Had a Diaplate prior that was good, but I like that these have replaceable grit plates so when it wears out, I can replace just the top surface and be ready to roll again.
good diamond stone, fast cutter, let's se how it agesPosted By: remi cura - verified customer
7 people found this review helpful
Plate diamond coverage is very regular, which is good.
Plate is aggressive, but I definitively use something coarser for big repair (diamond 140 grit).
I'm under the impression that it's not perfectly flat, which is OK for this kind of coarse grit.
I'm curious to see how it will age, as I've already worn several DMT diamond plates and I'm looking for something more durable.
7 people found this review helpful
Plate diamond coverage is very regular, which is good.
Plate is aggressive, but I definitively use something coarser for big repair (diamond 140 grit).
I'm under the impression that it's not perfectly flat, which is OK for this kind of coarse grit.
I'm curious to see how it will age, as I've already worn several DMT diamond plates and I'm looking for something more durable.
Very good lapping plate.Posted By: Jack
9 people found this review helpful
I originally bought the 400 grit plate for lapping my Shapton Pro stones but it works very nicely on naturals as well. So far I have used it on my Shapton Pro 1500, a Welsh purple slate and a Scottish Dalmore Blue with great results. These harder stones eat wet/dry sandpaper but the Atoma plate lapped them perfectly flat with minimal effort and less mess than using silicon carbide powder. I plan on buying the full set of Atoma plates, along with a couple of the smaller "slurry stones" to keep all of my stones in the best condition possible.
The level of service from CKTG has been excellent each time I have placed an order: shipping has been very fast, with tracking numbers provided and each order was carefully packed to avoid damage during shipping. This is now the first place I check when I need sharpening supplies.
9 people found this review helpful
I originally bought the 400 grit plate for lapping my Shapton Pro stones but it works very nicely on naturals as well. So far I have used it on my Shapton Pro 1500, a Welsh purple slate and a Scottish Dalmore Blue with great results. These harder stones eat wet/dry sandpaper but the Atoma plate lapped them perfectly flat with minimal effort and less mess than using silicon carbide powder. I plan on buying the full set of Atoma plates, along with a couple of the smaller "slurry stones" to keep all of my stones in the best condition possible.
The level of service from CKTG has been excellent each time I have placed an order: shipping has been very fast, with tracking numbers provided and each order was carefully packed to avoid damage during shipping. This is now the first place I check when I need sharpening supplies.
Had to review it...Posted By: Max S. - verified customer
7 people found this review helpful
I'm sorry to Mark for having to sort through all of my reviews, but I am continually impressed with what I buy from him! I have been using a DMT 120 grit plate, and a shapton glass plate for lapping 5 different brands of water stones, this Atoma 400 was a recent purchase. I went with this atoma for grits 1k and higher, so I can mainly use my shapton plate on glass stones. I found this plates grit rating perfect for stones from 1k-6k. I had no problem with this on one of my 8k stones as well, but it was a bit more coarse than I would have liked. THIS STONE IS GREAT! I recommend it over the DMT for lapping. I also enjoying sharpening with the plate as well, I really like the scratch pattern it leaves. The Atoma is ligher, and a bit longer than the DMT, also the suction effect is greatly reduced. All-round better choice in my opinion. If I did not already have 2x DMT 120s, I would purchase an Atoma 140. This is truly a great plate, nice n light weight. Don't hesitate. I could not be happier! You may want to consider a 600 grit if you already have have a 120 grit DMT plate, you could probably extend up to a 10k stone with the 600 and get a good surface.
7 people found this review helpful
I'm sorry to Mark for having to sort through all of my reviews, but I am continually impressed with what I buy from him! I have been using a DMT 120 grit plate, and a shapton glass plate for lapping 5 different brands of water stones, this Atoma 400 was a recent purchase. I went with this atoma for grits 1k and higher, so I can mainly use my shapton plate on glass stones. I found this plates grit rating perfect for stones from 1k-6k. I had no problem with this on one of my 8k stones as well, but it was a bit more coarse than I would have liked. THIS STONE IS GREAT! I recommend it over the DMT for lapping. I also enjoying sharpening with the plate as well, I really like the scratch pattern it leaves. The Atoma is ligher, and a bit longer than the DMT, also the suction effect is greatly reduced. All-round better choice in my opinion. If I did not already have 2x DMT 120s, I would purchase an Atoma 140. This is truly a great plate, nice n light weight. Don't hesitate. I could not be happier! You may want to consider a 600 grit if you already have have a 120 grit DMT plate, you could probably extend up to a 10k stone with the 600 and get a good surface.
