Metalworking - Catalog - Page 58
GRIT GRADING SYSTEMS
BONDED WHEEL SELECTION GUIDE
FEPA
(P-Grade)
CAMI
Finishing
Scale
Average Particle
Size In Inches
Micron
Scale µ
P2000
P1500
P1200
•
P1000
•
•
P800
•
•
P600
•
•
P500
P400
•
•
P360
•
•
P320
•
P280
•
•
P240
•
P220
•
P180
•
P150
•
P120
•
P100
•
P80
P60
•
P50
•
P40
•
P36
•
P30
•
•
P24
1000
800
•
600
•
500
•
•
400
•
•
360
•
•
•
320
•
•
280
•
•
•
•
240
•
•
•
•
220
180
150
•
120
•
100
•
80
•
•
60
•
50
•
40
•
36
•
30
24
•
•
•
A16
•
•
•
•
A25
A30
•
A35
•
•
•
A45
•
•
•
•
•
A60
•
•
A65
•
A75
•
A90
A85
A110
A130
•
•
A160
•
A200
•
•
•
•
•
•
•
•
•
•
•
•
•
•
.00042
.00051
.00060
.00062
.00071
.00077
.00079
.00085
.00092
.00098
.00100
.00112
.00118
.00018
.00137
.00140
.00158
.00158
.00172
.00177
.00180
.00197
.00204
.00209
.00217
.00228
.00230
.00254
.00257
.00304
.00363
.00378
.00452
.00495
.00550
.00608
.00749
.00768
.01014
.01045
.01271
.01369
.01601
.01669
.02044
.02087
.02426
.02488
.02789
.02886
9.5
12.3
15.3
16.0
18.3
19.7
20.0
21.8
23.6
25.0
25.75
28.8
30.0
30.2
35.0
36.0
40.0
40.5
44.0
45.0
46.2
50.0
52.5
53.5
55.0
58.5
60.0
65.0
66.0
78.0
93.0
97.0
116.0
127.0
141.0
156.0
192.0
197.0
260.0
268.0
326.0
351.0
412.0
428.0
524.0
535.0
622.0
638.0
715.0
740.0
REFERENCE
Comparable Grit
Symbol (Old Scale)
GRAIN
• A – Aluminum Oxide: for general purpose use on all metals
• C – Silicon Carbide: for use on stone and masonry applications.
*
*
*
*
*
*
*
*
GRIT
• 24 – Coarse: for fast cutting and maximum wheel life
• 30 – Medium/Coarse: for fast cutting and long wheel life
• 36 – Medium/Coarse: excellent for general purpose cutting
• 46 – Fine/Medium: for a smoother finish and reduced burr
• 60 – Fine: for a burr-free cut
• 80 – Fine: for a burr-free cut
10/0
*
*
*
*
*
*
GRADE
• TZ – Hard: for maximum wheel life
• R/S – Medium/Hard: for improved stock removal and life
• M/N – Soft: for maximum cut rate
SOFT VS. HARD WHEELS
9/0
*
*
SOFT
• Shorter wheel life
• High stock removal
• Faster cut
• Large contact areas
• Less bond holding the grain together
• For use on harder metals
8/0
*
*
*
*
7/0
HARD
*
*
*
*
6/0
• Longer wheel life
• Lower stock removal
• Slower cut
• Finer finishes
• Small contact areas
• More bond holding the grain together
5/0
4/0
*
WHEEL THICKNESS
2/0
*
CUT-OFF WHEELS
GRINDING DISCS
*
• 1/32" = .031"
• 3/64" = .045"
• 1/16" = .063"
• 5/64" = .078"
• 3/32" = .094"
• 1/8" = .125"
• 9/64" = .141"
• 1/8" = .125"
• 5/32" = .156"
• 1/4" = .250"
• 5/16" = .312"
3/0
0
*
*
1/2
*
1
*
1-1/2
2*
*
2-1/2
3
*
58
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