Best Sanding Discs for Random Orbital Sanders
Sanding is where a good project becomes a finished one, and most of the frustration comes from the wrong disc rather than the wrong technique. Grit sequence, hole pattern and abrasive type each change the result, and they cost almost nothing to get right.
Grit sequence, and why you cannot skip
Every sanding job is a sequence of removing the scratches left by the previous grit. Skipping a step does not save time, because the coarser scratches stay and show up the moment finish goes on.
| Grit | What it does | When to stop |
|---|---|---|
| 40 to 60 | Removes stock, levels a rough surface | Scratches are uniform |
| 80 | Removes the 60 grit scratches | Surface looks even under raking light |
| 120 | Removes the 80 grit scratches | Smooth to the hand |
| 180 to 220 | Final pass before finish | No visible scratches at all |
| 320 and up | Between coats of finish, and for polishing | Only if the finish calls for it |
The usual mistake is going past 220 on bare wood. Above about 220 the surface gets so burnished that stain and finish struggle to penetrate, and you get a blotchy result from a surface you spent extra time perfecting.
Backing: hook and loop or adhesive
- Hook and loop (velcro). Peels off and goes back on, so you can change grits mid-job and reuse a partly worn disc. This is what you want for almost everything.
- PSA (pressure sensitive adhesive). Sticks permanently to the pad. Cheaper per disc and slightly flatter, but you commit to one grit until it is worn out.
Hole count must match your sander
This is the detail people get wrong. The holes in the disc line up with the holes in the sander pad, and if they do not match, dust extraction stops working entirely and the disc loads up in minutes. Count the holes in your pad before ordering: 5 hole, 6 hole and 8 hole are all common, and universal multi-hole discs exist that fit most patterns.
Abrasive type
- Aluminum oxide. The standard. Cheap, works on wood, dulls reasonably fast. Fine for general work.
- Silicon carbide. Sharper and better on finish sanding and on non-wood materials. Common in wet and dry paper.
- Ceramic and zirconia. Much longer lasting, noticeably more expensive, and worth it if you are sanding a lot of hardwood or removing finish.
A disc is done when it stops cutting and starts heating the surface. If you are pressing harder to get the same result, change it: a loaded disc burns the wood and glazes over.
Frequently asked questions
Why does my sander leave swirl marks?
Usually a worn disc, too much downward pressure, or moving the sander too fast. Let the sander's weight do the work, keep it flat, and overlap passes by about half the pad width.
Can I reuse a clogged disc?
Partly. A crepe rubber cleaning block pulls a surprising amount of loaded dust out of a hook and loop disc and roughly doubles its life. Once the abrasive is glazed, no cleaning will bring it back.
Do I need dust extraction?
Yes, for two reasons beyond cleanliness: dust under the pad acts like grit and scratches the work, and a loaded disc cuts badly. Even a shop vacuum on the sander port makes a real difference.
Recommended for this project
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