Designed to be aggressive with quality, reliability and durability top of mind!

Our innovative bar-and-grate style modular and one piece MADConcaves are built to last from AR200 metal, allowing for longer wear and sharpness. Their easy-to-change design allows you to customize your combine to the crop with different precision grate spacings. Our concaves are fit for every combine and every crop type. From alfalfa to chickpeas, MADConcaves take the hassle out of changing concaves so you feel comfortable switching them out to get the best crop results during harvest.


The numbers .225, .300, .375, .437 represent the measurement of the gap between the bars.  The gap being .225 of an inch.

For more information on the right configuration for your crop, scroll down to view our John Deere, New Holland, and CASE IH configuration guides.

.225 Concave

  • Front position
  • Reduce dockage
  • Hard thresh crops
  • Wheat, flax, canary seed

.300 Concave

  • Front position
  • Allows more seed out of concave reducing rotor loss
  • Large easy thresh cereals

.375 Concave

  • Mostly second position but used in front position for large cereal crops that need some threshing
  • All crops

.435 Concave

  • First and second position
  • Very easy thresh crops like hemp
  • Very large seed crops, chickpeas, faba beans

Finger Grate Concave

  • Front position
  • New design for shatter resistant canola
  • Minimal threshing
  • Increased separation
  • Canola, peas, barley, oats, sunflower, corn, and soybeans

Slotted Concave

  • Front position
  • No threshing, full separation
  • No cracking
  • Edible beans, canola, sunflower

Alfalfa Concave

  • Both positions
  • Specially designed

Round Bar Concave

  • Both positions
  • Full separation


The new split frame concave with modular inserts, for John Deere and New Holland, was developed to be lighter (68lbs) and easier to handle and install into the combine.  Once  the frame is installed it is never removed, and the modular concaves (30lbs) are easy to insert and quick to swap out in mere minutes with two bolts per insert.  This design optimizes your yield and saves on people power and recalibration time.

New Holland split frame concave with interchangeable modular inserts.

John Deere split frame concave with interchangeable modular inserts.


.225 X9 Concave

.435 X9 Concave