Award-Winning Aftermarket Combine Concaves
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Cleaner threshing, better separation, and more harvest capacity with Razors Edge Concaves, built to perform across changing crops and conditions to reduce grain loss, protect sample quality, and keep your combine moving through tight harvest windows.
Available for John Deere · Case IH · Fendt · New Holland
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Grain That Won't Let Go
Most concaves don't open up soon enough or unload grain evenly across the cleaning system. That restricts capacity, carries more grain toward the back of the machine, and increases the risk of grain loss before you ever see it on the ground.
When grain finally separates, it often drops heavily in one area instead of spreading evenly across the sieves: overloading one side, making sample quality harder to control, and keeping your combine from handling the crop the way it should.
Open Sooner, Separate Earlier
Razors Edge Concaves open the crop sooner, create more separation area earlier in the process, and help move grain more evenly into the cleaning system.
The tighter, notched front section promotes aggressive grain-on-grain threshing. From there, the bar spacing opens progressively, front to back and side to side, distributing grain across more of the sieves instead of overloading one area.
That means better sieve loading, cleaner samples, reduced grain loss, and more usable combine capacity across changing crops and conditions.
3 Steps
How Razors Edge Works
Thresh Early
The tighter, notched front section creates aggressive grain-on-grain threshing to open the crop early.
Separate Sooner
Progressively open bar spacing creates more separation area so grain can leave the crop material sooner.
Unload More Evenly
Depending on the model, the spacing also progresses side to side to spread grain more evenly across the sieves.
From The Field
What Farmers Are Saying
The Razors Edge Concaves have completely changed how we run our combine. The grain flows smoothly through the machine, letting us take in more crop and run faster without any machine loss. We used to have the standard round bars overloading one side. Now the grain is evenly distributed.
Our first year with the Thunderstruck Ag Concaves we were happy with what we saw. In large green lentils they did a very nice clean job with pretty much zero damage, and in durum they did probably the best job of what we were running. Canola samples were clean too. Overall we were happy.
The spacing allows larger-seeded crops to fall through, but it's also aggressive enough to thresh out the harder-thresh crops like durum and flax.
Sample quality has been no problem. Our wheat sample was on par with a competitor product running three cover plates, with no cover plates. On nine different soybean varieties our samples have been great, again running no cover plates.
The build quality is very good. They're heavy. They seem to last really good. The edges are staying sharp over all the acres we've done. So far, so good.
The sample quality is excellent. We've actually had to lower fan speeds to dirty up the sample, if anything. They run a real clean sample.
The Razors Edge Concave is gentle on crops because they're aggressive enough to do the threshing, but you can open up your machine a little more than with standard concaves and slow the rotors down. You can do a really good, gentle job on everything and still have enough thresh ability to get everything clean, separated and threshed.
They work for all crops — big faba beans, small canola, everything in between. You don't have to change concaves. We recommend them to our neighbours and family.
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Find the Razors Edge Concaves designed to help your combine thresh cleaner, separate earlier, and handle more crop with less grain loss.