Eagle Superabrasives is a premier supplier of superabrasive supplies in the United States. With an extensive inventory of over 6,000 Diamond, CDX and CBN Wheels in stock, we are able to ship ninety percent of orders same-day! Custom orders can be filled in as little as seven days.
CBN Wheels
CBN stands for cubic boron nitride. It is an abrasive material that rivals the hardness of diamond and out performs diamond when grinding certain materials. While diamond has held the spotlight for many years as the industries superior choice of superabrasive, CBN wheels are the ultimate wheels for grinding materials such as hardened steel or other ferrous metals.
Effect of CBN Wheels Grit Size on Surface Finish
CBN is great for grinding most grades of steels, but they must have a hardness of 45Rc or above to be ground effectively with CBN.
Hardened stainless steels have been found to be ground effectively and profitably with CBN resin bond wheels.
Unlike diamond, CBN wheels do not react to iron, so ferrous materials are not a problem when using CBN.
Check out all of our CBN wheels here.
Below we have included a chart that displays the standard of grit size and the effect it has on the finishing surfaces.
| Effect of grit size on surface finish | CBN standard | FEPA Standard of CBN |
| CBN Rough Grinding |
60/80 80/100 |
B251 B181 |
| CBN Medium Grinding |
120/140 140/170 170/200 200/230 |
B126 B107 B91 B76 |
| CBN Finishing |
230/270 270/325 325/400 |
B64 B54 B46 |
| Super Finishing CBN |
500 600 800 1000 1200 1500 |
B30-40 B22-36 B20-30 B15-25 B10-20 B8-15 |
Trust the experts
When you’re ready to try the best, trust the experts at Eagle Superabrasives. Our friendly and knowledgeable staff will provide you with unparalleled customer service, offering advice and support along the way. Contact us today!