Discs
Pro
Grit · 320
Festool Granat 5-Inch Disc, 320 Grit (25-pack)
Between coats. Smooths what the first coat raised. Leaves the color alone.
FEPA P-grade · Converted
P320 in CAMI grit and microns.
P320 paper averages about 46.2 µm on the FEPA table. On the US CAMI scale that is between CAMI 240 and 320. A sheet printed plain "320" is a different animal: about 36 µm, nearer P400. If the instructions say P320 and the pack has no P on it, reach for the CAMI number, not the digits.
- Avg. particle
- ~46.2 µm
- FEPA table
- Nearest CAMI
- 240–320
- by particle size
- Plain "320"
- ~36 µm
- CAMI 320 ≈ P400
- 3M Trizact
- ·
- no A-grade paired by 3M
What P320 is for
Between coats of poly or lacquer; scuffing paint before recoat.
- Norton 3X P320Between coats of poly or lacquer.
- Festool Granat P320Between coats.Check price →
Either side of P320
The neighborhood.
At this grade
Paper we link at P320.
Questions people ask
What is P320 in CAMI grit?
It falls between CAMI 240 and CAMI 320. P320 averages 46.2 microns, and no CAMI grade lands within 10% of that.
How many microns is P320 sandpaper?
About 46.2 microns average particle diameter, per the FEPA P-grade table (ISO 6344).
Is P320 the same as 320 grit?
No. P320 averages 46.2 microns; a sheet printed plain "320" on the CAMI scale averages 36, which is closer to P400. The CAMI sheet is the finer of the two.
Convert any other grade, from CAMI, microns or a Trizact A-number, on the grit converter.
Sizes are average particle diameters from the published FEPA (ISO 6344) and CAMI (ANSI B74.12/B74.18) tables. "Nearest" means within 10%; otherwise both neighbors are shown. Trizact pairings are 3M's own. Sources: Wikipedia, "Sandpaper" grit table (rev. 1127917881); Klingspor coated abrasives grit chart.