How do I choose the right filament diameter for my brush?

How do I choose the right filament diameter for my brush?

Start from the finish you need, then balance stiffness against conformity: thicker for aggressive cutting, thinner for fine, uniform surfaces.

Diameter determines how stiff each filament strand is. Stiff strands press harder into the workpiece and remove material faster; flexible strands follow contours and spread the cutting action over more contact points.

0.3 - 0.6 mmFine detailing, contour following, light deburring and fine finishes on small parts.
0.8 - 1.2 mmAll-round middle range for surface preparation, general deburring and brushing.
1.5 - 2.5 mmHeavy-duty brushes for stone lines and aggressive stock removal with high power.

Three checks before fixing the diameter

  • 1. Brush density: Dense brush faces can use thinner filaments to keep stiffness where it counts.
  • 2. Machine power and speed: High-power, high-speed lines handle stiffer, larger diameters without stalling.
  • 3. Target finish: If the next step is polishing, choose one diameter finer than you think and test.
Silicon carbide filament diameter comparison Brush design using medium diameter abrasive filament Large diameter filament for heavy duty brushes
We can produce trial brushes in two diameters for side-by-side testing - start via our OEM FAQ.