Quick Scoop

The finest grit sandpaper commonly found is around **400 grit** , though some specialty abrasives go finer, often **600 grit or higher** for very smooth finishing work.

What that means

  • 120 to 220 grit is usually considered fine for general DIY use.
  • 240 to 400 grit is very fine, and anything above that is often labeled extra-fine.
  • For specialty jobs, you may see 600 grit or finer.

Practical answer

If you’re asking for the finest grit you’ll commonly see in normal stores , the answer is 400 grit.

If you mean the finest available at all , specialty products can go beyond that, sometimes into the 600+ range and even much higher in industrial use.

Best use cases

  • 400 grit : final smoothing before painting or finishing.
  • 600 grit and above : ultra-smooth finishing, delicate surfaces, or specialty polishing tasks.

If you want, I can also give you a simple grit chart from coarse to finest.