The following chart is an example of the ANSI standard marking system for identifying grinding wheels and other bonded abrasives.
A | 24 | R | BF |
---|---|---|---|
Primary grain used to make the wheel | Size of the abrasive grain | Hardness of the bond | Type of bond used |
A = Aluminum Oxide C = Silicon Carbide Z = Alumina Zirconium SG = Seeded Gel | CoarseMediumFineVery Fine 8 30 70 220 10 36 80 240 12 46 90 280 14 54 100 320 16 60 120 400 20 150 500 24 180 600 | Soft Medium Hard ![]() A N R T Z | B = Resinoid BF = Resinoid Reinforced E = Shellac O = Oxychloride R = Rubber RF = Rubber Reinforced S = Silicate V = Vitrified |
Wheel Configurations
Bonded abrasive wheels have different configurations depending upon the tool the wheel is used on and the desired end result.
Below are the configurations that a wheel can have:
![IconType1](https://www.unitedabrasives.com/wp-content/uploads/2019/04/IconType1.jpg)
Type 1 / Type 41 –Straight Wheel
![IconTYPE27](https://www.unitedabrasives.com/wp-content/uploads/2019/04/IconTYPE27.jpg)
Type 27 /Type 42 –Depressed Center Wheel
![IconTYPE28](https://www.unitedabrasives.com/wp-content/uploads/2019/04/IconTYPE28.jpg)
Type 28 – Saucer-Shaped Wheel
![IconType29](https://www.unitedabrasives.com/wp-content/uploads/2019/04/IconType29.jpg)
Type 29 – Flexible Wheel
![IconType11](https://www.unitedabrasives.com/wp-content/uploads/2019/04/IconType11.jpg)
Type 11 – Flaring Cup Wheel
![Type16Cone](https://www.unitedabrasives.com/wp-content/uploads/2019/04/Type16Cone.jpg)
Type 16 – Rounded Cone
![Type17Cone](https://www.unitedabrasives.com/wp-content/uploads/2019/04/Type17Cone.jpg)
Type 17 – Straight-Sided Cone
![Type18Plug](https://www.unitedabrasives.com/wp-content/uploads/2019/04/Type18Plug.jpg)
Type 18 – Plug
![IconType18RPlug](https://www.unitedabrasives.com/wp-content/uploads/2019/05/IconType18RPlug.jpg)