When choosing a diamond blade, the type of blade is important. What’s also important are the blade thickness and diamond grit.
Diamond grit characteristics
While there are many diamond grits available, 3 in particular (35/40, 45/50. 60/70) are used in the majority of electroplated diamond blades and tools.
| Diamond Grit | Characteristics |
|---|---|
| 30/35 | Very Rough |
| 35/40 | Rough
Good for when speed is important and a finished, smooth edge is of less importance. This grit will leave small nicks on the edge of gel coated parts (especially if they’re thin). Only recommended on blades 3/32” thick or thicker. If used on 1/16” thick blades, blade life will be greatly reduced. |
| 40/45 | Rough / Medium |
| 45/50 | Medium
Great for general purpose. Produces a largely nick-free finish and is recommended in 95% of all blade applications. The exceptions are gel coated or acrylic FRP laminates where a finer grit will be preferred. 45/50 grit offers a good compromise between speed of cut and finish and can also be used on 1/16” thick blades. |
| 50/60 | Medium / Medium Fine |
| 60/70 | Fine
Good for trimming gel coated or acrylic FRP laminates or when a smooth, nick-free edge is important. However, blade life is reduced compared to a 45/50 grit blade. |
| 80/100 | Very Fine |
| 100/120 | Extremely Fine |
To find out more about blade thickness and grit, read Choosing the Right Blade – Thickness & Diamond Grit