Norton 66252939809 Surface Grinding Wheel 7in 80 Grit

Product Description

The NORTON 66252939809 is a Type 1 surface grinding wheel designed for precision stock removal on flat surfaces. Built from white aluminum oxide abrasive with a vitrified bond, this wheel delivers consistent cutting action and good form retention across a range of metalworking applications. It measures 7 inches in diameter, 1/4 inch thick, with a 1-1/4 inch arbor hole. The 80 grit, J hardness (medium grade) combination is well suited for controlled material removal where surface finish and wheel life both matter. Rated to a maximum of 3600 RPM, it fits standard surface grinder spindles used in production and toolroom environments. Weight is approximately 0.79 pounds.

This wheel is intended for use on soft carbon steels, tool steels, and super alloys. It is compatible with surface grinders, cylindrical grinders, and CNC cutting tool machines. The semi-friable aluminum oxide grain fractures during grinding to expose fresh cutting edges, which helps maintain cut rate without excessive heat buildup — an advantage when working harder tool steels or maintaining close tolerances on finished workpieces. Typical installers are machinists and grinding machine operators in toolroom, job shop, and production manufacturing settings.

Key Features

• White aluminum oxide abrasive — semi-friable grain for consistent self-sharpening action
• Vitrified bond provides rigid structure and good porosity for coolant flow
• 80 grit, J hardness (medium grade) balances stock removal rate with surface finish quality
• Type 1 flat wheel profile with no recess — direct mount to standard surface grinder spindles
• 3600 RPM maximum speed rating
• Non-tapered, non-porous wheel body for predictable wear characteristics

Compatibility

Suitable for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Recommended material applications include soft carbon steels, tool steels, and super alloys. Arbor hole size of 1-1/4 inches fits standard surface grinder spindle configurations for this wheel diameter.

Installation Notes

Grinding wheel mounting must be performed by a qualified machinist or machine operator following ANSI B11.9 and OSHA 29 CFR 1910.215 standards for abrasive wheel machinery. Always ring-test the wheel before mounting and inspect for cracks or damage. Power down and lock out the machine before changing wheels. Never exceed the maximum RPM rating stamped on the wheel; verify the machine spindle speed matches before starting.