Norton 66252942794 Surface Grinding Wheel 80 Grit 7 in

Product Description

The NORTON 66252942794 is a Type 5 recessed surface grinding wheel designed for precision stock removal on ferrous metals. Built around a vitrified-bonded aluminum oxide abrasive, this wheel operates at a maximum of 3600 RPM and carries an I hardness code with a medium-grade rating. At 7 inches in diameter and 1 inch thick, it fits standard surface and cylindrical grinder arbors with a 1-1/4 inch bore. The 38A series aluminum oxide grain is semi-friable, meaning it fractures under load to expose fresh cutting edges, maintaining consistent cut rate on soft carbon steels, tool steels, and super alloys. Licensed machinists, tool grinders, and production grinding technicians are the primary installers and operators.

This wheel suits surface grinders and cylindrical grinders in both job-shop and production environments. Its Type 5 geometry features a single-side recess 3 inches in diameter and 1/2 inch deep, which reduces contact area and heat buildup during flat surface and outside-diameter grinding operations. The 80-grit, medium-grade specification positions it as a general finishing and semi-finish stock-removal wheel across a range of ferrous workpiece materials including soft carbon steels, tool steels, and super alloys.

Key Features

• Semi-friable aluminum oxide abrasive (38A series) self-sharpens under grinding pressure for consistent cut rate
• Vitrified bond provides rigidity and open structure for cool cutting
• Type 5 single-side recess reduces wheel-to-workpiece contact area and thermal load
• 80 grit, medium grade (I hardness) suited for semi-finish and general stock removal
• 3600 RPM maximum speed rating clearly marked per ANSI safety standards
• White wheel color provides visual wear indication during dressing cycles

Compatibility

Rated for use on surface grinders and cylindrical grinders. Material application includes soft carbon steels, tool steels, and super alloys as stated by the manufacturer. Arbor bore is 1-1/4 inches; verify spindle speed does not exceed the 3600 RPM maximum operating speed before mounting.

Installation Notes

Grinding wheel installation must be performed by a qualified operator following ANSI B11.9 and OSHA 29 CFR 1910.215 guidelines. Always perform a ring test before mounting and inspect the wheel for cracks or chips. Machine spindle must be fully de-energized and locked out before changing wheels. Never exceed the 3600 RPM maximum speed marked on the wheel, and always use the correct flanges and blotters for proper clamping.