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The structure of a grinding wheel refers to the relative spacing of the abrasive grains; it is the wheel's density. There are fewer abrasive grains in an open-structure wheel than in a closed-structure wheel. A number from 1 to 15 designates the structure of a wheel.
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
Grade:
Soft: B, D, E, F, G, H
Med: I, J, K, L, M, N
Hard: O, P, Q, R, S, T
Bond:
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.
AA Abrasives carries its own line of Grinding Wheels. We are also an authorized distributor of Norton Grinding Wheels.
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