Norton 66253207707 Surface Grinding Wheel 46 Grit

Product Description

The NORTON 66253207707 is a Type 1 surface grinding wheel built for precision stock removal on ferrous metals. Constructed with aluminum oxide abrasive and a vitrified bond, this wheel measures 12 inches in diameter, 1.5 inches thick, with a 5-inch arbor hole. It carries a coarse 46-grit rating with an H hardness code, placing it on the softer end of the hardness scale for efficient, free-cutting action. The vitrified bond structure is porous, allowing coolant penetration and heat dissipation during heavy material removal operations. Licensed machinists and tool grinders are the primary installers and operators.

This wheel is rated for use on surface grinders, cylindrical grinders, and CNC cutting tool machines. It is suited for grinding hard carbon steels, soft carbon steels, and tool steels. The 32A Series designation reflects a specific aluminum oxide grain structure optimized for these ferrous applications. The wheel is non-tapered and has no recess, making it a straightforward flat-face Type 1 form. Maximum operating speed is 2,070 RPM and must not be exceeded under any circumstances. Typical applications include surface grinding of flat workpieces and finish passes on tool steel components in production or job-shop environments.

Key Features

• Aluminum oxide abrasive with vitrified bond for consistent, controlled cut on ferrous materials
• Coarse 46-grit, H hardness (soft hardness rating) for free-cutting, aggressive stock removal
• Porous wheel structure promotes coolant flow and reduces heat buildup at the grind zone
• Type 1 flat wheel profile with no taper and no recess for straightforward surface grinding setups
• 32A Series grain specification — designed for hard carbon steels, soft carbon steels, and tool steels
• Maximum operating speed of 2,070 RPM clearly rated for safe machine matching

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Recommended material applications include hard carbon steels, soft carbon steels, and tool steels as specified by the manufacturer.

Installation Notes

Installation should be performed by a qualified machinist or grinding machine operator. Before mounting, inspect the wheel for cracks or chips using the ring test per ANSI B7.1 safety standards, and ensure the machine spindle speed does not exceed the 2,070 RPM maximum rated speed of the wheel. Use the correct blotter and flanges sized for a 5-inch arbor hole, and never overtighten the mounting nut beyond what is needed to secure the wheel without distortion. Always dress the wheel before initial use and after any storage period to true the face and expose fresh abrasive grain.