Norton 66252940203 Surface Grinding Wheel 80 Grit 7in

Product Description

The NORTON 66252940203 is a Type 1 surface grinding wheel built for demanding material removal on hard-to-grind metals. Measuring 7 inches in diameter and 0.5 inches thick with a 1.25-inch arbor hole, it uses a ceramic abrasive grain bonded in a vitrified matrix. The 5SG series ceramic grain is semi-friable, meaning it fractures under load to expose fresh cutting edges rather than glazing over. Rated at a maximum of 3,600 RPM, this wheel carries an L hardness code and is classified as medium grade. It is installed and dressed by machinists, tool grinders, and surface grinding specialists working in precision metalworking environments.

This wheel is intended for surface grinding, cylindrical grinding, and CNC cutting tool machine applications. It is specifically suited for difficult-to-machine materials including 400 series stainless steel, hard carbon steels, tool steels, titanium, super alloys, cast iron, ductile iron, and gray iron. Its porous, vitrified structure promotes coolant flow and chip clearance, reducing heat buildup at the workpiece. The blue wheel color is characteristic of the 5SG ceramic series and helps distinguish it from conventional aluminum oxide wheels on the shop floor.

Key Features

• Ceramic abrasive grain (5SG series) with semi-friable structure for consistent, self-sharpening cuts
• Vitrified bond with open, porous structure for improved coolant penetration and chip clearance
• 80 grit, medium grade (hardness code L) for balanced stock removal and surface finish
• Type 1 straight wheel profile with no recess and no taper
• Rated to 3,600 RPM maximum operating speed
• Suitable for 400 series stainless, tool steels, titanium, super alloys, and iron grades

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Rated for material applications including 400 series stainless steel, hard carbon steels, tool steels, titanium, super alloys, cast iron, ductile iron, and gray iron. Conforms to Type 1 straight wheel geometry with a 1.25-inch arbor hole.

Installation Notes

Grinding wheel mounting and dressing should be performed by qualified machinists or grinding specialists following ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels. Always verify the machine spindle speed does not exceed the 3,600 RPM maximum rating marked on the wheel before mounting. Power down and lock out the grinder before changing wheels, and perform a ring test to check for cracks prior to installation. Use properly rated flanges and a compressible blotter between the flange and wheel face; never exceed the rated speed or force-mount a wheel onto an undersized spindle.