The Indian standard marking system for grinding wheels has been prepared with a view of establishing a uniform system of marking of grinding wheels to designate their various characteristics.
Prefix Manufacturer’s abrasive type symbol
First element (letter) Type of abrasive
Second element (number) Size of abrasive
Third element (letter) Grade of bond
Fourth element (number) Structure of the grinding wheel
Fifth element (letter) Type of bond
Suffix Manufacturer’s symbol
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