Length Graders


The Crippen Indented Cylinder Length Grader is extremely accurate. To determine separations of product by product length, the Crippen Length Grader simply lifts the shorter product out of the longer product of the main product flow that enters the cylinder intake end. These machines can be stacked in to multiple banks to achieve any desired capacity, most commonly from 100 to 2000 Bu/hr (2.7 to 55 MTPH).

These machines can be arranged in a “Series Flow” or “Parallel Flow” arrangement. The “Series Flow” is arranged to make multiple separations of an incoming product flow in a common bank of cylinders. A common example would be removing both small weed seeds and long trash or wild oats from a good wheat product flow. The “Parallel Flow” arrangement is simply multiple cylinders in a common bank performing the same product separation, such as removing short or cross-broken kernels from a good long-kernel rice product flow. The Crippen Indented Cylinder Separator is an ideal machine to have in the processing of any product that has a difference in product lengths.


  • Exclusive Tapered Cylinder Design for Positive Cleanout
  • 23 Diameter × 88 Long Separating Cylinders
  • Crippen Quick Change Cylinders Standard
  • Hardened Cylinders Standard, the Hardest in the Industry
  • Sealed Friction Rollers Standard
  • Highest Quality Sealed Roller Bearings Standard
  • Sprocket and Chain Drive Standard
  • TEFC 3ph/60hz/230-460 volt Motors
  • Optional Direct Drive with VFD Controller to Adjust Cylinder Speeds
  • Optional Mechanical Hi-Lo Drive to Adjust Cylinder Speed
  • Modular Design Allows Machines to Be Stacked
  • A Bank of Cylinders Consists of Multiple S-1 Machines Stacked on Top of One Another
  • A Single Bank May Be Stacked as Many as Five Cylinders High
  • Each Bank May Be Stacked as Wide as the Application Requires

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Length Grader Brochurepdf_icon_small



Barley Seeds 50
Barley Wheat 75 – 100
Barley Oats 75 – 100
Flax Water Grass 35 – 50
Flax Small Seeds 35 – 50
Flax Quack Grass 100 – 125
Hybrid Corn Short Kernels 30 – 40
Oats Vetch 14
Oats Pin Oats 50 – 75
Oats Seeds 75 – 100
Wheat Vetch 50 – 75
Wheat Barley 75 – 100
Wheat Oats 100 – 150
Wheat Seeds 75 – 125
Paddy Rice Broken Weed Seed 2700 – 2800
Milled Rice Brokens 3300 – 3500
Sunflowers Sticks 3800 – 4000
Grass Seed Longs or Shorts Depends on Variety

* Capacities will vary depending on impurities to be removed and desired quality of finished product.



Hybrid Corn Plants

The Crippen length grader is exceptionally efficient at separating hybrid seed into various lengths. The special features of the Crippen machines result in greater accuracy. Various height arrangements may be set to re-run either the liftings or the rejects.

Rice Mills

The Crippen machine is used in rice mills to grade clean rice. The cylinders may be installed in banks of various heights to obtain all the necessary separations for grades from extra fancy to brewers. The machines may also be furnished with indent cylinders to lift shelled or clean rice from paddy rice in rough cleaning in seed warehouses.

Flour Mills

The Crippen S1 and S1-QC is recommended for use in all flour mills. Installed in banks of various heights, the Crippens obtain optimum separations and capacities. They may be used particularly to reclean wheat from oat tailings from other equipment.

Oat Cereal Plants

The Crippen graders can be equipped with indent cylinders to separate oats into various lengths, removing the pin oats before the products go to the hullers. They can be supplied in many height arrangements.

Grass Seed Processors

The Crippen length graders are extremely popular in the world for removing longs and shorts from good grass seed. Again, through the use of varying height arrangements, proper sizing can be done efficiently and easily.

Sunflower Processors

In the Sunflower Industry, the Crippen S-1 is used to remove unwanted long trash such as sticks and stems. The Crippen model is used by many processors to achieve the highest standards in quality cleaned sunflower products today.


MODEL Cylinder Diameter Cylinder Features
S-1-QC 23″ Tapered & Quick Change
S-4 23″ Diameter x 55″ Long Tapered & Quick Change
LG Lab 15″ Split Cylinder Direct Drive
LGX-1 23″ Split Cylinder
K-48 48″ Split Cylinder Direct Drive
D-2-A 23″ & 15″ Double Cylinders – Both Long and Short Separations in One Machine

S-1-QC Grader


LGX-1 Grader


K-48 Grader


D-2-A Grader