120 Surface & Cylindrical Grinding Wheels - Recessed Grinding Wheels

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Primary Material Application

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Aluminum
Brass
Bronze
Cast Iron
Masonry
Natural Stone
Nickel Alloy
Stainless Steel
Steel
Titanium
Tool Steel

Diameter

6 in
7 in

Thickness

1/4 in
1/2 in

Abrasive Material

Abrasive materials cut and smooth the workpiece. Abrasives perform differently based on the workpiece material and is also affected by the grade and bond.

Aluminum Oxide is a strong, sharp, and durable abrasive that withstands heat and high speeds.
Silicon Carbide is a sharp synthetic abrasive that breaks down quickly to maintain a sharp edge for fast cutting of nonmetallic and low-tensile strength metals.
Ceramic self-sharpens to speed cutting which keeps the surface cooler, making it a good choice for heat-sensitive metals.

Aluminum Oxide
Silicon Carbide

Abrasive Material Grade

Abrasive grade is a Norton-specific general classification of the quality and characteristics of the abrasive material used in the wheel.

32A is a vitrified monocrystalline aluminum oxide grain for cool and fast cutting of vanadium alloys and other steels. It's suitable for use at moderate to heavy feed rates with minimal dressing in cylindrical, surface, and toolroom grinding.
38A is fused white aluminum oxide that is highly friable to maintain a sharp edge when grinding and sharpening high-speed tool steel, heat-sensitive steels, and cast-alloy steel.
39C is a green silicon carbide abrasive that is highly friable to maintain a sharp cutting edge for high efficiency and high-quality cutting of nonferrous metals such as bronze, aluminum, and titanium.
5SG is a ceramic abrasive that limits loading to provide cool cutting action on hard carbon steel, tool steel, super alloys, and titanium.

Grit

Grit describes how the size of the abrasive grains. Coarser grits have larger grains with more space between the cutting edges to break down more quickly to maintain a sharp edge and remove material quickly. Finer grits have a smoother surface that remove less material and produce a smoother finish.

Bond

The bonding agent holds abrasive grains together. It contributes to wheel hardness, porosity, grinding temperature, resistance to loading, and the optimal working speed. It also determines the optimal contact area. Large contact area indicates a wheel over 1/2" width or workpiece wheel contact of 50% or more of total wheel width. Medium contact area indicates a 1/4" to 1/2" wheel width or workpiece wheel contact of 25% to 50% of total wheel width. Narrow contact area indicates a wheel less than 1/4" wide or workpiece wheel contact of up to 25% of total wheel width.

V is a tough vitrified bond for high-temperature grinding. Medium contact grinding should be used for general purpose grinding. A narrow contact area is suitable for fine grits and form or corner holding applications.
VBE is a general purpose vitrified bond for narrow to medium contact areas.
VBEP is a porous vitrified bond that provides high chip clearance to provide cool cutting in high stock removal. Medium to high contact areas are suitable for cutting heat-sensitive materials.
VMT is a vitrified bonded silicon carbide abrasive for general purpose applications and medium contact areas.
VS is a vitrified bond used for roughing, finishing, and high stock removal and narrow to medium contact area grinding.
VSP is a vitrified bond that provides high chip clearance to keep the workpiece cool in high stock removal applications and wide contact areas.

Specification

Wheel specification is a Norton-specific code that identifies wheel composition by abrasive, grit, wheel hardness grade, structure (grain spacing), and bond type. This code, printed on all Norton conventional grinding wheels, can be used to quickly identify replacement wheels.

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