Here is a grit size comparison chart that will come in useful when comparing across different grit systems!

 

The grit sizes are defined by the number of lines per inch (25,4 mm) length of each sieve e.g. 150 lines per inch. Abrasives grit 150 will pass this sieve. This chart is a general overview only. We are not responsible for any errors.

FEPA P
Paper
Micron
μm
FEPA F
Grain
Micron
μm
JIS R6001
Japan
1973
Micron
μm
ANSI Micron
μm
MM
F5 4125
F6 3460
F7 2900
F8 2460
F10 2085
P12 1815 F12 1765
F14 1470
P16 1324 F16 1230
P20 1000 F20 1040
F22 885
P24 764 F24 745
P30 642 F30 625
P36 538 F36 525
P40 425 F40 438
F46 370
P50 336 F54 310
P60 269 F60 260 J60
F70 218
P80 201
F80 185
P100 162
F90 154
P120 125 F100 129 J100 125 100 125
F120 109
P150 100
P180 82 F150 82 J150 80 150 80
P220 68 F180 69 J180 70 180 70
F220 58 J220 58 220 58
Micro grains J240 80
J280 68
P240 58.5 ± 2 J320 57
P280 52.2 ± 2 F230 53 ± 3 240 51
P320 46.2 ± 1.5 J360 48
F240 44.5 ± 2
P360 40.5 ± 1.5 J400 40 280 41.5
P400 35.0 ± 1.5 F280 36.5 ± 1.5
J500 34 320 33
P500 30.2 ± 1.5 F320 29.2 ± 1.5 J600 29 360 28
P600 25.8 ± 1
P800 21.8 ± 1 F360 22.8 ± 1.5 J700 24 400 22.5 1500
P1000 18.3 ± 1 J800 20
F400 17.3 ± 1 J1000 16 500 18
P1200 15.3 ± 1 600 14 1800
P1500 12.6 ± 1 F500 12.8 ± 1 J1200 13 2400
P2000 10.3 ± 0.8 800 12 3200
F600 9.3 ± 1 J1500 10
P2500 8.4 ± 0.5 J2000 8 1000 7.8
P3000 7
P5000 5
F800 6.5 ± 1
F1000 4.5 ± 0.8 J3000 5 1200 5.5 4000
6000
F1200 3.0 ± 0.5 J4000 3 8000
F1500 2.0 ± 0.4 J6000 2 12000
F2000 1.2 ± 0.3 J8000 1.2

 

Legend

FEPA (Fédération Européenne des Fabricants de Produits Abrasifs) Federation of European Producers of Abrasives. The FEPA distinquishes between grain for sanding paper (FEPA P) and grain for sharpening stones or wheels (FEPA F) The decisive factor for comparison is FEPA F. FEPA P is only used for sanding paper.

JIS (Japanese Industrial Standard) issued by the Japanese Standards Association.

ANSI American National Standards Institute.

MICRON (μ) is the letter “micron” in the Greek alphabet. As measuring unit it describes 1 thousandth of a millimeter (1 μ = 0.001mm). A Micron row is added to each FEPA P, FEPA F, JIS und ANSI row for comparison.

MM Micro-mesh grit in comparison to other standards.

 

 

Source: https://www.fine-tools.com/G10019.html