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What Does The Rest Of The Description Mean After The Size?
- Dec 12, 2018 -
T-1 means the grinding wheel is flat. This is also referred to as a Type 1 Grinding Wheel or a straight toolroom wheel;
Vitrified is the bonding of grinding wheel;
A36 - A means it is an aluminum oxide grinding wheel and the 36 means the grinding wheel is composed of a medium grain size also known as grit.  See the grain size chart below.
A/O  also means aluminum oxide;
RPM is the Revolutions Per Minute or Maximum Operating Speed  - not all specifications will show this. The tool, the grinding wheel and application must be in agreement to ensure safe operation.

Grinding Wheel Specification Sheet

Grain Size/Grit:
Coarse: 8, 10, 12, 14, 18, 20, 24
Medium: 30, 36, 46, 54, 60
Fine: 80, 100, 120, 150, 180
Soft: B, D, E, F, G, H
Med:  I, J, K, L, M, N
Hard: O, P, Q, R, S, T
V- Vitrified
B- Resin
B2: Resin Bonded
BF: Reinforced Resin
Grain Types:
A- Dark Aluminum Oxide – Most common grain. Used for Heavy Duty General Purpose
AS3- 20% Ceramic Aluminum Oxide, 30% Pink Grain, 50% White Grain. Excellent for form and corner holding.
AZ- Blue Aluminum Oxide- Grinds fast with excellent cool cutting action and requires minimal dressing.
RA- Red Aluminum Oxide (Ruby)- Harder grain and sharper than PA & AZ wheels good for steels with high level chromium
PA- Pink Aluminum Oxide- General Purpose Grain that is tough but friable. Tool Room sharpening applications.
WA- White Aluminum Oxide- Highly friable grain for fast cool cutting. Good for light grinding on all steels particularly on tool and die steels.
GC- Green Silicon Carbide- very friable use for carbide grinding applications.