· What is a carborundum Stone? If you've only been around sharpening for a few years, you've probably never heard of a carborundum stone It isn't that these stones don't exist, it is because. Read more. Industrial Stock Catalog. Today with our enlarged product offering, we deliver engineered grinding solutions for, Grinding Wheels 1/2" 2" OD,, Carborundum BFCW, BFC, BFX2. Read .