FLAP DISC ZIRCONIUM 115MM 40 GRIT FLAT

What is grit?

When talking about sandpaper 'grit' is a reference to the number of abrasive particles per inch of sandpaper. The lower the grit the rougher the sandpaper and conversely, the higher the grit number the smoother the sandpaper.

This make sense if you imagine how small the particles on an 1000-grit sandpaper would need to be to fit into a 1' square (25,4mm square). Sandpaper is referred to by the size of its grit (Example 120-grit sandpaper or P120 sandpaper).

Flat or conical disc styles

Flat
The flap disc has a flat surface for maximum efficiency when used at 0-15° angles. The flap disc is most suitable for grinding flat surfaces.

Conical
The flap disc has a slight conical surface for grinding at 10-25° angles. The flap disc is most suitable for grinding contoured surfaces.

To extend the service life on a flap disc, lower the speed to half of the MAX rpm rated on the disc. This could extend the service life almost 100%. This can be accomplished by using a variable speed angle grinder.

YouTube Grinder basics: Using a flap disc