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Grinding wheel markings explained

For a grinding wheel inquiry, please use fill in the form at the bottom of this page

Standard grinding wheel markings

For clarity as well as to avoid mistakes in wheel selection, a standard designation of wheel specification was developed and was inscribed by ISO in 1965. Standards such as CNS of the R.O.C., JIS of Japan, ANSI of U.S.A. and DIN of West Germany all employ this uniform Standard.

A typical wheel marking includes the following information :

When ordering grinding wheels, specify your selection in this order:

1. Wheel Shape and Face

2. Dimensions: Diameter (D), Thickness (T), Hole Size (H)

3. Wheel Specifications: Type of Abrasive, Grit , Grade, Structure, Bond

WA	46	K	8	V	7N
Abrasive	Grit	Grade	Structure	Bond Type	KINIK Symbol

Abrasives		Bond Type
Symbols	Characteristics	Symbols	Characteristics
A	Regular aluminum oxide, hard and tough suitable for mild steel. Cast -iron etc. in rough grinding	V (Vitrified)	Most common bond for precision grinding porosity and strength. Wheels made with this bond give high stock removal and their rigidity helps to attain high precision Not affected by water, acid, oils or ordinary temperature variations.
10A	The prime regular aluminum oxide, hard and tough It is suited for cylindrical grinding of unhardened steels.
WA, 38A	White aluminum oxide, hard and brittle. Suitable for all kinds of steel grinding
32A	Strong sharp monocrystaline aluminum oxide Suitable for ail kinds of tool precision grounding	B (Resinoid)	Used for wheels in fabrication shops, foundries, billet shops, sharpening and gumming saws, and in many precision applications These wheels excel in rapid stock removal as well as in applications requiring better finishes. This bond is also restricted to reinforced resinoid products, cut-off wheels, or cut-off wheels, and for snagging with portable grinders
FA, 57A	Semi-friable, with a grinding action intermediate A and WA. Suitable for cylindrical grinding of steel sparts.
PA	Pink aluminum oxide, is suitable for tool grinding and surface grinding.
RA	Ruby aluminum oxide, hand and less brittle than PA. Suitable for high alloy steel etc, in precision grinding.
PSA	Special pink abrasive, simular to 32A.Suitable for all kinds of hard steels in precision grinding	R (Rubber)	Used for most centerless feed wheels, precision ball race grinding wheels, and for snagging with portable grinders Used where finish is important and for cut-off wheels where burr and burn must be held to a minimum
AZ	A modified high zirconia aluminum oxide, used in foun-dries snagging cast iron and steels for heavy duty work
C	Black silicon carbide. Used for grinding gray iron, non-ferrous metals and nonmetallic materials such as glass, rubber, stones etc	Mg (Magnesia Oxychloride)	A notable bond used for cutlery or particularly thin workpieces, marble surface grinding and super finishing.
GC	Green silicon carbide, is well suited for special alloygrinding such as tungsten carbide, cold-rolled steels,sapphire, glass, gem and granite.
Note : Above abrasive may be used in combination to generate characteristics for particular applications.		Note: The KINIK symbol designates a variation or modification of bond and other characteristics of the wheel.

Grades : Grade indicated the relative strength of the bond which holds the abrasive grains in place.

Very Soft	Soft	Medium	Hard	Very Hard
D.E.F.G.	H.I.J.K.	L.M.N.O.	P.Q.R.S.	T.U.V.W.X.Y.X.

Grits (CNS & JIS Standard)

Coarse	Medium	Fine	Very Fine	Ultra Fine
10 12 14	30 36 46	70 80 90 100	240 280 320 400	1000 1200 1500 2000
16 20 24	54 60	120 150 180 220	500 600 700 800	2500 3000 4000