STANDARD GRINDING WHEEL MARKING


ABRASIVE GRIT SIZE GRADE SIZE STRUCTURE BOND CODE SYMBOL
  Course Medium Fine "D"
 to
"H"
Soft Dense
1
2
3
4
5
6
7
8
9
10
11
12
13
14

Open / Porus
B- Resinoid Letters or Numbers to Designate a Variation of bond or characteristics of the wheel
Aluminum Oxide "A" 8 V - Vitrified
White Aluminum Oxide "AA" 10 R - Rubber
Pink Aluminum Oxide "RA" 12 "I"
 to
"P"
Medium E - Shellac
Mixture of Brown "A" 14 O - Oxychlo
Black Silicon "C" 16 S - Silicate
Green Silicon Carbide "G C" 20 "R"
 to
"Y"
Hard  
Aluminum Zirconium "Z" 24  


Abrasives: Letter symbols are used to identify three main groups of abrasives normally used in the grinding wheels.They are
A for Aluminum Oxide
C for Silicon Carbide
Z for Aluminum Zirconium
Prefix to these letters indicate some particular variations in these groups.

Grain Size : Means strength of bonding of a grinding wheel : in other words hardness denoted by English Alphabets Starting from D (Softest) to Z (hardest). Very soft DFFG Soft HIJK Medium LMNO Hard PQRST Very hard UVWXYZ.

Selecting of gift: Finer grit worse finish, softer material, light stock removal, uninterrupted surface and small contact area Coarser grit worse finish, softer material, heavy stock removal, form surface and larger contact area.

Bond Type : Types of Bonds are denoted by following letters.
V = Vitrified, R = Rubber, S = Silicate
B = Resinoid, E = Shellac, O = Oxychloried


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