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