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Depressed Center wheels are used for stock removal, blending, grinding, cutting, notching and deburring applications without interference from the mounting. They are available with or without a hub and are designed for right angle grinders.

Diagram of a Depressed Center Wheel

Cut-off Wheels Diagram

Essential Tips:

  • Wheels that are 1/4" thick are designed to be used for grinding only
  • Wheels measuring less than 1/8" in thickness are designed for cutting or notching only
  • Wheels measuring exactly 1/8" thick are considered combination wheels and can be used for light grinding operations or for cutting

Wheel Types:

Type 27 Depressed-center Wheels Image

Type 27 wheels are made with flat grinding rims or faces and are designed for side grinding.

Tyoe 28 Deoressed-center Wheels Image

Type 28 wheels have convex (saucer) shaped rims and are designed for corner and side grinding.

Tyoe 29 Deoressed-center Wheels Image

Type 29 wheels have concave (reversed) saucer shaped grinding rims and are designed for blending (stock removal that leaves a smooth finish).

Note: Type 28 and 29 wheels should not be used for cutting-off or notching operations.


Aluminum Oxide is the most commonly used abrasive. Best suited for general-purpose deburring and blending, it is tough, economical and fracture resistant. It is commonly used on ferrous alloys, high-tensile materials and wood.

Aluminum Oxide/Silicon Carbide blends are durable and commonly used on steel parts with scale and iron castings.

Ceramic provides a sharp, high-purity grain that offers cooler cutting, and is more durable than natural aluminum-based products. It is commonly used for precision grinding of steels, hard alloys and exotic materials.

Ceramic Alumina is suited for general-purpose deburring and blending. It is commonly used on ferrous alloys, high-tensile materials and wood.

Diamond is one of the hardest abrasive materials. It is commonly used in grinding and polishing ceramic, stone and aluminum alloy.

Silicon Carbide is a fast-cutting abrasive that is harder than ceramic. It is commonly used on nonferrous metals and in low-pressure applications.

Tungsten Carbide (TC) is used at high temperatures due to its high wear resistance. It is commonly used on ferrous and nonferrous materials, including cast iron, nickel alloys and stainless steel.

Depressed Center Wheels Image

Zirconia Alumina is best for medium- to heavy-material removal and is more durable than aluminum oxide. The material grains constantly fracture to produce new sharp edges. It is commonly used on carbon steels, aerospace alloys, nickel alloys, aluminum and cast iron.

More Grinding Wheels from MSC:

Bench and Pedestal Cut Off Wheels Image

Bench and pedestal grinding wheels are used for sharpening, shaping and deburring parts and tools. Bench grinding wheels are generally used on stone and metal materials. Choose a category below for the right bench grinder wheels for your applications.

Centerless and cylindrical Cut Off Wheels Image

Centerless and cylindrical grinding wheels are used for stock removal and finishing. Centerless wheels are used in combination with a feed wheel and a rest blade to support the workpiece. Cylindrical wheels are used when the workpiece is held between centers or chucks and produce cylindrically shaped workpieces.

Cut-off Grinding Wheels Image

Cut-off wheels are bonded with an abrasive grain and used for cutting, notching and grinding. They are used with both portable and stationary tools on numerous materials, including aluminum, plastic, sheet metal, stainless steel, wood and more.

Tool and cutter Wheels Image

Tool and cutter grinding wheels are used to fabricate, repair or sharpen tools, including milling cutters and drills. They can be used in portable and stationary equipment, including CNC machines.

Surface wheels Image

Surface grinding wheels are used for stock removal to produce a smooth finish on flat surfaces.

Internal wheels Image

Internal grinding wheels are small-diameter wheels used for grinding inside diameters of bearings, small cylinders and compressors.

Feed wheels Image

Feed wheels are used in conjunction with centerless grinding wheels on centerless grinders.