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Materials Science Overview
Grit Grading Systems
Grit Size Comparison
Hardness of Materials
Abrasive Grit Grading Systems
JIS
Mesh
FEPA
P-grade
(Europe)
Grit
ANSI
Grit
Average
Particle
size µm
Trizact
3M
Micron
Symbol
Flint
Finishing
Emery
Polishing
Flint
Emery
SC
Equal Finish
50000
0.05
25000
0.1
10000
0.6
0.5
9000
0.8
8000
1
1
6000
2
2
4000
3
3
3000
4
A5
4
Ultra Fine
2500
5
A6
5
2000
P2000
1200
6.5
1500
P1500
1000
9
9
1200
800
12
12
Super Fine
1000
P1200
15
A16
15
800
600
16
4/0
600
P1000
18
3/0
500
20
A20
20
P800
22
2/0
500
400
24
A30
10/0
0
P600
26
A35
400
P500
360
30
A40
30
P400
320
36
A45
9/0
7/0
1/2
Very Fine
360
P360
41
40
320
280
44
8/0
6/0
P320
46
280
P280
240
53
A65
50
7/0
5/0
1G
Fine
P240
60
A80
60
240
P220
220
66
A90
6/0
4/0
2
Extra Fine
70
70
P180
180
78
A100
80
5/0
3/0
3
150
93
A130
90
4/0
2/0
Fine
Medium
P150
97
100
120
116
A160
120
3/0
Fine
Coarse
P120
127
Medium
100
141
A200
2/0
Extra Coarse
P100
156
150
P80
80
195
180
0
Medium
Coarse
P60
60
264
1/2
P50
326
Extra Coarse
50
351
1
P40
40
420
1-1/2
Coarse
P36
36
530
2
Extra Coarse
P30
30
630
2-1/2
P24
24
728
3
20
905
3-1/2
P20
984
P16
16
1320
4
P12
1746
12
1842
4-1/2
Courtesy of
3M
Grit Size Comparison
USA
European (Grade)
Micron Size
Surface Finish on Stainless Steel
RA µm
RA µ inch
60
60
250
2
85
80
80
180
1.65
70
100
100
150
120
120
106
1.50
50
150
150
90
0.75
30
180
180
75
0.62
25
220
220
68
240
P280
52
0.45
18
280
P360
42
0.40
15
320
P400
34
0.25
10
400
P800
22
600
P1200
14
800
P2400
8
1000
P4000
5
Hardness of Materials
Material
Knoop Hardness
Talc
20
Silver
60
Copper
163
Aluminum
80-250
Annealed Steel
200
Martensite
500-800
Glass
530
Carburized Steel
730
Chromium Plating
740
Quartz (Silicon Dioxide)
820
White Cast Iron
840
Nitrided Steel
970
Cementite (Iron Carbide)
1025
Zirconia
1160
Zirconium Boride
1550
Chromium Carbide
1735
Molybdenum Carbide
1800
Titanium Nitride
1800
Tungsten Carbide
1880
Tantalum Carbide
2000
Alumina
2100
Zirconium Carbide
2100
Beryllium Carbide
2410
Titanium Carbide
2470
Silicon Carbide
2480
Aluminum Boride
2500
Vanadium Carbide
2660
Boron Carbide
2750
Titanium Diboride
4400
Diamond
7000
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