Grit Comparison Aug 11 2009 .pdf

Stone, Belt, Paper, Film and Compound Grit Comparison
Description

ANSI/CAMI FEPA
(USA)
(Europe)
8
10
P12
12
P16
16
P20
20
24
P24
P30
30
P36
36
P40
46

JIS JIS
Old New

Shapton Hones

Norton Stones

DMT Diamond
Plates

Trizact

P50
54
P60
60
70
P80

A300

80
P100
90
P120

Coarse Crystolon(^)

A160

Pro 120 Grit
100
Extra-Extra Coarse
120
100 micron belt
P150

Coarse India(#)

A130

Medium Crystolon(^)

A110

220 Grit Water Stone

A90

150
80 Micron belt
P180

180

P220

220

180
3M 74 micron diamond stone
Pro & Glass 220 Grit
220
240 Grit
60 Micron belt

240

Extra Coarse

P240

A80
240
Medium India(#)

F230, P280

A65
280

280 Grit

240
280
P320

320

A60
Pro 320 Grit

F240

Fine Crystolon(^)

Coarse

360 Grit
3M 40 micron diamond stone & belt

P360

360

320

280
400 Grit
Medium diamond
35 Micron belt

F280
P400

360 Grit Water Stone
Fine India(#)

360

A45

400
320
30 Micron belt

P500

400

A40
Glass 500 Grit

F320
500
P600

A30
500

Fine
600 Grit

600
Extra Fine India(#), 22 Micron belt

400

F360
P800

600 Grit Water Stone
700

20 Micron belt, 3M 20 micron stone

700 Grit
600

500
800 Grit
18 Micron belt

P1000
F400

800

A20
700

600

800 Grit Water Stone
1,000

15 Micron belt, 15 micron SiC paper

P1200

A16
Pro & Glass 1,000 Grit

Medium Ceramic

700

800

1,000 Grit Water Stone

Grit size in
microns
2210
1854
1764
1600
1322
1092
984
940
686
740
622
559
524
483
412
356
351
326
305
268
260
254
203
195
165
156
145
127
122.5
122
120
102
100
97
89
80
78
76
74
66.82
65
63
61.25
60
58
57
53.5
53
52.5
50
48
46
45.94
45
40.83
40
39
36.75
36
35
34
31
30
29.4
29
28
25.8
25
24.5
24
23
22
21
20
19
18.38
18
17
16
15.5
15
14.7
14

1,200

13
12.6
12.25
12
11.5
11
10.8
10.5
10.3
10
9.8
9.5
9.2
9
8.5
8.4
8
7.5
7.35
7
6.7
6.5
6
5.88
5.7
5.5
5
4.9
4
3.68
3
2.94
2.45
2
1.84
1.47
1.2
1
0.98
0.92
0.74
0.5
0.49
0.3
0.25
0.15
0.07

P1500
1,200 Grit
12 micron belt

800
1,000
1,200 Grit Water Stone
1,500
P2000

3M 10 micron diamond stone
Pro 1,500 Grit
1,200
F600
9 micron belt

1,500 Grit Water Stone

900

Extra-Fine
2,000
P2500
1,500
2,000 Grit Water Stone
Pro & Glass 2,000 Grit

1,000

2,500

Ceramic
2,000

F800
6 Micron belt

4,000 Grit Water Stone
2,500 Grit
3,000
2,500

5 micron SiC paper

1,200

F1000
3,000 Grit
3,000
Glass 4,000 Grit

Green Rouge, 3 Micron belt, Tormek cmpd(~)

1,500

F1200

4,000

8,000 Grit Water Stone

Extra-Extra-Fine

Pro 5,000 Grit
6,000 Grit

1 Micron belt, Linde C($)

F1500

6,000

F2000

Pro & Glass 8,000 Grit
10,000 Grit
8,000
Pro 12,000 Grit

2,000
Pro 15,000 Grit
Glass 16,000 Grit
20,000 Grit

Linde B($)

15,000 Grit Water Stone
Pro & Glass 30,000 Grit

Linde A($)
60,000 Grit
100,000 Grit
200,000 Grit
25.4 Microns = 1 Thousanth of a US Inch (0.001")

-

1 Micron = 3.9 Hundred Thousanths of a US Inch (0.0000393700787")

-

0.254 Microns = 1 Milionth of a US Inch (0.000001")

It is impossible to make exact comparisons between all the different abrasives because different standards are used for average, minimum and maximum size, the percentage allowed outside
those limits, and the distribution of sizes within those limits, but this list is the closest comparison available since all entries are compared to microns by their respective manufacturers.

~ Tormek compound contains a variety of grains of various size, the smallest down to 0.7 micron. The average effective size is 3 micron.
^ Crystolon is Norton Abrasives tm for Silicon Carbide stones
# India is Norton Abrasives tm for Aluminum Oxide stones
$ Raybrite and Linde compounds are aluminum oxide powders
Old JIS standard is measured via sedimentation tube - Used until 1973
New JIS standard measured via electrical resistance - Used since 1973
Shapton sizes are from their web site www.shaptonstones.com
DMT sizes from their web site www.dmtsharp.com
All Norton sizes taken from "Norton Abrasives Grit Table"
Trizact Numbers from "3M Superabrasive & Microfinishing Product Application Guide"
ANSI Numbers from Washington Mills "ANSI GRIT SIZE CONVERSION CHART" in average Microns
FEPA Numbers from LECO Corporation grit comparison "Sheet 15"
FEPA Variance is based on a published variance rate of 75% at listed size with 25% variance within specified limits.
FEPA & Old JIS Variance Numbers from Schmitz Metallographiebedarf "Korngrößenvergleich" - Thanks to Olivia of SRP Forums!
New Japanese Industrial Standard Variance Chart from Naniwa High-purity abrasive powders Comparison Sheet - Thanks to JimR of SRP Forums!
FEPA Coated Abrasives Variance Chart (Microns)

P series

FEPA Bonded Abrasives Variance Chart (Microns)

F series

P240
P280
P320
P360
P400
P500
P600
P800
P1000
P1200
P1500
P2000
P2500

58.5±2.0
52.2±2.0
46.2±1.5
40.5±1.5
35.0±1.5
30.2±1.5
25.8±1.0
21.8±1.0
18.3±1.0
15.3±1.0
12.6±1.0
10.3±0.8
8.4±0.5

F230
F240
F280
F320
F360
F400
F500
F600
F800
F1000
F1200
F1500
F2000

55.7±3.0
47.5±2.0
39.9±1.5
32.8±1.5
26.7±1.5
21.4±1.0
17.1±1.0
13.7±1.0
11.0±1.0
9.1±0.8
7.6±0.5
2.0±0.4
1.2±0.3

Old Japanese Industrial Standard Variance Chart

Microns

Some Japanese Water Stone Related Kanji:

240
280
320
360
400
500
600
700
800
1000
1200
1500
2000
2500
3000

60±4
52±3
46±2.5
40±2
34±2
28±2
24±1.5
21±1.3
18±1
15.5±1
13±1
10.5±1
8.5±0.7
7±0.7
5.7±0.5

六十型 = Type 60
キング = King brand
砥石 = Toishi whetstone
スエヒロ = Suehiro brand
天然砥石 = Natural Whetstone
最高級品 = High grade product
ベスタ = Besuta / Bester brand
京都特産 = Kyoto special product
酔拳 = Suishin Brand "Drunken Heart"
北山 = Kitayama / North Mountain brand
嵐山 = Arashiyama / Storm Mountain brand
ナニワ = Naniwa Kenma brand ( エビ = ebi / shrimp trademark)
シャプトン = Shaputon / Shapton brand ( 刃の黒幕 = kuromaku / professional grade)

New Japanese Industrial Standard Variance Chart

Max Size

3% Max

50% Average

94% Minimum

240
280
320
360
400
500
600
700
800
1000
1200
1500
2000
2500
3000
4000
6000
8000

127
112
98
86
75
63
53
45
38
32
27
23
19
16
13
11
8
6

103
87
74
66
58
50
43
37
31
27
23
20
17
14
11
8
5
3.5

57±3
48±3
40±2.5
35±2
30±2
25±2
20±1.5
17±1.3
14±1
11.5±1
9.5±0.8
8±0.6
6.7±0.6
5.5±0.5
4±0.5
3±0.4
2±0.4
1.2±0.3

40
33
27
23
20
16
13
11
9
7
5.5
4.5
4
3
2
1.3
0.8
0.6 (75% Minimum)

Compiled by Smokintbird with help from Olivia and JimR of SRP Forums and Yuzuha of Knifeforums