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Corundum Grinding Wheel Guide
White, brown, and chrome corundum (aluminum oxide) types explained — selection, bonds, grit, and hardness grades.
Read MoreSinoGrind is an aluminum oxide grinding wheel manufacturer and supplier. We produce conventional alumina (corundum) grinding wheels and aluminum oxide grinding discs in white, brown, and pink grades for steel, stainless steel, tool steel, and cast iron grinding.
Available in vitrified bond and resin bond. Grit sizes from 16# to 1000#, hardness grades G–P, diameters from 100 mm to 750 mm. Custom specifications welcome.
Contact UsAn aluminum oxide grinding wheel (also called an aluminium oxide grinding wheel, alumina grinding wheel, or corundum grinding wheel) is the most widely used conventional abrasive wheel for ferrous metal grinding. Aluminum oxide (Al2O3) grains are tough, blocky, and chemically stable on steel, making these wheels the industry standard for cylindrical grinding, surface grinding, tool and cutter grinding, and general machine-shop work.
SinoGrind supplies industrial aluminum oxide grinding wheels and aluminum oxide grinding discs as a direct manufacturer. Whether you need a vitrified bond grinding wheel for production cylindrical grinding, a resin bond cut-off disc, or a 120 grit aluminum oxide grinding wheel for tool sharpening, we can match your machine and workpiece requirements.
Aluminum oxide grinding wheel manufacturer and supplier with export experience. Standard catalog sizes plus custom diameters, bores, and thicknesses.
White (WA), brown (A), and pink (PA) aluminum oxide. Vitrified and resin bonds. Grit 16#–1000#, hardness G–P.
Selection help for steel, stainless steel, cast iron, and tool steel. See our corundum grinding wheel guide and grinding wheel selection guide.
Choose the aluminum oxide grade that matches your workpiece material, hardness, and finish requirement. White aluminum oxide, brown aluminum oxide, and pink aluminum oxide each have distinct grinding characteristics.
The workhorse aluminum oxide abrasive. Tough, economical grains for general-purpose grinding of carbon steel, alloy steel, cast iron, and forgings. Best for roughing and medium-duty cylindrical or surface grinding.
High-purity, friable alumina with sharp cutting edges. Runs cooler and resists loading, making it the preferred white aluminum oxide grinding wheel for hardened steel, stainless steel, and precision finishing.
Chrome-doped alumina with a balance of toughness and sharpness. Pink aluminum oxide grinding wheels excel on high-speed steel, alloy tool steel, and high-production tool and cutter grinding.
A vitrified bond grinding wheel uses a ceramic glass matrix. It is rigid, porous, and self-sharpening, holds form accurately, and allows coolant to reach the grinding zone. Vitrified aluminum oxide wheels are the standard for production cylindrical grinding, surface grinding, and centerless grinding of steel parts.
Best for: cylindrical grinding, surface grinding, centerless grinding, production steel grinding
Resin bond aluminum oxide wheels are more flexible and give cooler cutting with a finer surface finish. They are widely used for aluminum oxide cut-off wheels, snagging wheels, tool sharpening wheels, and applications where chatter reduction matters.
Best for: cut-off, snagging, tool sharpening, bench grinder wheels
Selecting the right aluminum oxide grinding wheel depends on workpiece material, machine type, and required surface finish. Use the guide below as a starting point, or send us your drawing for a free recommendation.
| Workpiece / Operation | Recommended AO Type | Bond | Grit Size | Hardness |
|---|---|---|---|---|
| Carbon steel roughing | Brown (A) | Vitrified | 24# – 46# | K – N |
| Alloy steel cylindrical grinding | Brown or Pink (A / PA) | Vitrified | 46# – 80# | J – L |
| Hardened steel finishing | White (WA) | Vitrified | 60# – 120# | G – J |
| Stainless steel | White (WA) | Vitrified | 46# – 80# | G – I |
| Cast iron surface grinding | Brown (A) | Vitrified | 36# – 60# | L – P |
| HSS tool & cutter grinding | Pink (PA) | Vitrified or Resin | 46# – 100# | H – K |
| 120 grit tool sharpening | White or Pink (WA / PA) | Vitrified or Resin | 120# | H – J |
| Cut-off / chop saw | Brown (A) | Resin | 24# – 36# | M – Q |
| Bench grinder general use | Brown or White (A / WA) | Vitrified | 36# – 60# | I – L |
| Centerless grinding (steel bars) | Brown or White | Vitrified | 46# – 80# | J – L |
For carbon steel, alloy steel, and tool steel, a brown or pink aluminum oxide vitrified wheel provides reliable material removal at low cost. Pair softer hardness grades with harder workpieces so dull grains shed and expose fresh cutting edges.
See also: what grinding wheel for stainless steel
Brown aluminum oxide wheels in medium-to-hard grades handle cast iron, welds, and general maintenance grinding. For bench grinder use, a medium grit (36#–60#) aluminum oxide grinding stone or wheel covers most sharpening and deburring tasks.
Related: grinding accessories · centerless grinding wheels
Industrial aluminum oxide grinding wheels are marked with a standard code. Example: WA46K5V = white aluminum oxide, grit 46#, hardness K, structure 5, vitrified bond. Brown aluminum oxide is marked A, pink is PA.
| Grit | Use |
|---|---|
| 16# – 24# | Heavy stock removal, snagging, weld grinding |
| 30# – 36# | Rough cylindrical / surface grinding |
| 46# – 60# | General-purpose production grinding |
| 70# – 80# | Medium finishing, tool grinding |
| 100# – 120# | Fine finishing, 120 grit AO wheels for tools |
| 150# – 180# | Precision finishing |
| 220# – 400# | Ultra-fine finishing / fine lapping-type work |
| 600# – 1000# | Microgrit finishing, super-fine surface work |
| Grade | Softness | Typical Use |
|---|---|---|
| G – I | Soft | Hardened steel, stainless steel |
| J – K | Medium-soft | Alloy steel, tool steel |
| L – M | Medium | General carbon steel |
| N – P | Hard | Soft steel, cast iron |
Rule of thumb: hard workpieces need soft wheels; soft workpieces need hard wheels. This keeps aluminum oxide grains cutting instead of glazing.
Straight wheels (1A1), cup wheels, cylinder wheels, and resin-bonded cut-off discs. Typical diameters: 100, 125, 150, 175, 200, 250, 300, 350, 400, 500, 600, 750 mm. Bore sizes and thicknesses customized to your machine spindle.
If you need an aluminum oxide grinding disc for angle-grinder or chop-saw use, specify diameter, thickness, bore, and RPM rating — we will quote the correct resin-bonded aluminum oxide cut-off wheel.
Aluminum oxide grinding wheels are conventional abrasive wheels used to grind ferrous metals including carbon steel, alloy steel, stainless steel, tool steel, and cast iron. They are the standard choice for cylindrical grinding, surface grinding, tool and cutter grinding, off-hand bench grinding, and cut-off operations. For tungsten carbide or ceramics, use diamond grinding wheels instead.
Brown aluminum oxide (A) is tougher and more economical, making it the general-purpose choice for steel and cast iron roughing. White aluminum oxide (WA) is purer, friable, and sharper cutting, so it runs cooler and is preferred for hardened steel, stainless steel, and precision finishing where heat damage must be minimized. Pink aluminum oxide (PA) sits between them and is favored for alloy steels and high-production tool grinding.
Coarse grit (16#–36#) is for heavy stock removal and snagging. Medium grit (46#–60#) balances removal rate and surface finish for general-purpose grinding. Fine grit (80#–120#), including 120 grit aluminum oxide grinding wheels, is used for finishing and tool sharpening. Ultra-fine grit (180#–1000#) is for precision finishing and lapping-like operations.
Vitrified bond aluminum oxide wheels are rigid, porous, and self-sharpening. They hold form well, allow coolant flow, and are the standard for production cylindrical and surface grinding. Resin bond aluminum oxide wheels are more flexible and provide cooler cutting and finer surface finish, making them suitable for cut-off wheels, tool sharpening, and applications where chatter must be reduced.
Yes. White aluminum oxide grinding wheels with softer grades (G–J) and open structure are recommended for stainless steel. Softer grades release dull grains quickly, preventing wheel loading and workpiece burn. Avoid hard-grade brown aluminum oxide wheels on stainless steel, as they tend to glaze and generate excessive heat.
Aluminum oxide is a conventional abrasive: lower cost, widely used on steels and cast iron, and available in many shapes. CBN (cubic boron nitride) is a superabrasive with much higher hardness and thermal stability. CBN wheels last longer on hardened steels (HRC 45+) and high-speed steels, but cost more. Use aluminum oxide for general steel grinding and CBN for high-volume precision grinding of hardened ferrous materials. See our diamond and CBN grinding wheels for superabrasive options.
A typical marking such as A46K5V means: A = brown aluminum oxide abrasive, 46 = grit size, K = hardness grade, 5 = structure (grain spacing), V = vitrified bond. White aluminum oxide is marked WA, pink is PA. Understanding this code helps you select the correct aluminum oxide grinding wheel for your machine and workpiece.
Buy direct from a China manufacturer of white, brown, and pink custom abrasive wheels. Non-standard sizes and OEM batches supported.
Aluminum oxide grinding wheel manufacturer in China — white (WA), brown (A), and pink (PA) in vitrified and resin bonds.
Custom abrasive wheel supplier for non-standard diameter, thickness, and bore. Application-specific grit/hardness.
Request a custom grinding wheel quote with material, machine type, and annual volume. Flexible MOQ.
White, brown, and chrome corundum (aluminum oxide) types explained — selection, bonds, grit, and hardness grades.
Read MoreWhy white aluminum oxide with soft grades is preferred for stainless steel finishing.
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Read MoreOver 20 years of grinding expertise. Diamond, CBN, and conventional abrasive solutions for precision manufacturing worldwide.
