Micrometers to JIS grit
Type a value in µm to get it in JIS instantly.
#564JIS
That's 1.19× as coarse as P1000 wet-and-dry for paint, while P320 paper between coats is 2.1× coarser.
Convert the other way: JIS to µm
What it means
How coarse is that grit?
Average particle sizes from FEPA (ISO 6344), ANSI B74.12/B74.18 and JIS R6001. Brands and bonds vary; treat values between listed grits as estimates.
The math
How to convert µm to JIS
Grit scales are tables: P220 = 68 µm = CAMI 220, but P1000 = 18.3 µm ≈ CAMI 600. Between listed grits the size is interpolated.
Example: 21.8 µm = #564 JIS.
Every unit
That grit in every standard
Tables
µm to JIS conversion table
| µm | JIS |
|---|---|
| 10.3 µm | #1120 JIS |
| 12.6 µm | #912 JIS |
| 18.3 µm | #657 JIS |
| 21.8 µm | #564 JIS |
| 25.8 µm | #484 JIS |
| 35 µm | #360 JIS |
| 46.2 µm | #289 JIS |
JIS to µm conversion table
| JIS | µm |
|---|---|
| #289 JIS | 46.2 µm |
| #360 JIS | 35 µm |
| #484 JIS | 25.8 µm |
| #564 JIS | 21.8 µm |
| #657 JIS | 18.29 µm |
| #912 JIS | 12.6 µm |
| #1120 JIS | 10.3 µm |
Quick answers
Quick answers
- How many JIS is 10 µm?
- 10 µm is #1150 JIS.
- How many JIS is 21.8 µm?
- 21.8 µm is #564 JIS.
The units
About these units
Micrometers (µm)
The average particle size.
JIS grit (JIS)
The Japanese grade used for water stones and fine papers.
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