Norton 66252939529 Surface Grinding Wheel 220 Grit 7in

Product Description

The NORTON 66252939529 is a Type 1 surface grinding wheel engineered for precision stock removal and finish grinding on soft carbon steels, tool steels, and super alloys. Constructed from aluminum oxide abrasive with a vitrified bond, this wheel delivers consistent cut rates and long service life across high-cycle applications. It measures 7 inches in diameter, 1/4 inch thick, with a 1-1/4 inch arbor hole. Rated at a maximum of 3600 RPM, this wheel operates at 220 grit with a medium hardness rating (Hardness Code L), placing it in the very fine grade category. It carries the 38A220-LV specification designation. Machinists, tool grinders, and surface grind operators typically specify this wheel for finish passes and close-tolerance work.

This wheel is designed for use on surface grinders, cylindrical grinders, and CNC cutting tool machines. The 220 grit very fine grade makes it well suited for finish grinding operations where surface finish quality is critical. The non-porous, vitrified bond structure holds the aluminum oxide abrasive firmly during wet or dry grinding passes, providing predictable wheel wear and minimal loading on softer ferrous workpiece materials including soft carbon steels, tool steels, and super alloys.

Key Features

• Aluminum oxide abrasive provides semi-friable cutting action suited to ferrous metals
• Vitrified bond maintains wheel form and delivers consistent stock removal
• 220 grit very fine grade for finish grinding and close-tolerance surface work
• Medium hardness (Code L) balances wheel life against workpiece surface finish
• Non-porous, non-tapered Type 1 straight wheel profile with no recess
• White wheel color aids visual inspection for loading and glazing during use

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Suitable for grinding soft carbon steels, tool steels, and super alloys. Arbor hole size of 1-1/4 inches is required for proper mounting.

Installation Notes

Grinding wheel installation must be performed by a qualified machinist or tool-room professional following ANSI B11.9 and applicable OSHA standards for abrasive wheel machinery. Before mounting, inspect the wheel for cracks using a ring test and verify that the machine spindle speed does not exceed the 3600 RPM maximum rating stamped on the wheel. Always use proper wheel flanges and a compressible blotter between the flange and the wheel face. Dress the wheel with an appropriate dressing tool after mounting and before the first grinding pass.