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Industry Color-Coded System
ANSI Standard Marking System
The following chart is an example of the ANSI standard marking system for identifying Bosch grinding wheels and other bonded abrasives:
A
Primary Grain Used
to Make the Wheel
A = Aluminum oxide
AS = Aluminum oxide
special
C = Silicon carbide
CS = Silicon carbide
special
Z = Aluminum zirconium
Wheel Configurations and Uses
Bonded abrasive wheels have different configurations depending upon the tool on which the wheel is used and the
desired end results. Below are the configurations that a wheel can have.
Type 1A
Type 1
(ISO 41)
GRINDING
CUTTING
C
C
B
A
A
Straight
Straight
Wheel
Wheel
Type 1A
Bench or
(ISO 41)
Type 1
Used at a 90°
Used for edge
angle for
grinding at a
cutting only.
50°-90° angle.
No grinding.
Not for cutting
applications.
A = Wheel diameter B = Wheel width or thickness C = Wheel bore
Metal /
General Purpose
Concrete /
Masonry
Sample of typical marking: A 30 T-BF
30
Size of the Abrasive Grain
Very coarse
8-12
Coarse
14-24
Medium
30-60
Fine
70-180
Dust fine
200-800
Type 27A
Type 27
CUTTING
BLENDING
GRINDING
C
B
B
A
Depressed
Depressed
Center
Center
Wheel
Wheel
Type 27A
Type 27
To be used at
For use on flat
a 90° angle
surfaces for
for light
weld prep,
cut-off work.
usually on bar
stock or angle
iron. Tool best
used at a
30° angle. No
cutting.
Toll Free: 877-BOSCH-99
Gr ind in g
Stainless
Pipeline
T
Hardness of Bond
Soft
Medium
Hard
N
P
R
S
Type 28
GRINDING
C
C
B
B
A
A
Saucer-
shaped
Wheel
Type 28
To be used
For blending and
stock removal on
for weld
preparation
uneven surfaces,
and de-burring
best used at a
surfaces. Tool
10° angle. This
usually used at
allows user to
a 15° angle, to
use one wheel
cover greater
surface area
and finishing.
and allow
better visibility.
Wh eel s
Asphalt
Aluminum
BF
Type of Bond Used
B ____ Resinoid
BF __ Resinoid Reinforced
T
Type 29
Type 11
BLENDING
GRINDING
GRINDING
C
C
B
A
A
Flexible
Flared Cup
Wheel
Wheel
Flap Disc
Type 29
Type 11 Steel-
Concrete
Used for removing
excess material
and build-up on
large flat surfaces,
allowing for
maximum surface
for grinding
area coverage
– tool used
perpendicular
to work.
Boschtools.com
B
167