Inspection data from 1988 to 1990 validated a previous prediction equation for corn particle size distribution and showed the relative distribution to be independent of market location, BCFM level, and other grade factor data. Samples (62) of corn screenings obtained from country elevators were size-separated in 2/64-in. increments, from 4.5/64 in. to 16/64 in. Smaller particles had lower bulk density, higher particle density, more mycotoxins, higher protein, and lower starch than larger particles. About 17% of the material was larger than 12/64-in., which means it would not have been classed as broken corn-foreign material in the grades. Removal efficiency for commercial cleaners was estimated, by size increment, as a function of removal efficiency for BCFM.