Norton 66252939658 Surface Grinding Wheel 80 Grit 7in

Product Description

The NORTON 66252939658 is a Type 1 straight surface grinding wheel built for precision stock removal on a wide range of ferrous and non-ferrous metals. It measures 7 inches in diameter, 1/4 inch thick, with a 1-1/4 inch arbor hole. The abrasive material is aluminum oxide bonded in a vitrified bond matrix, rated at 80 grit with an I hardness code (medium grade). Rated to 3600 RPM, this wheel is engineered for controlled, consistent cutting action on surface, cylindrical, and CNC tool grinding applications. It weighs approximately 0.79 pounds and carries the series designation 32A80-IVBE.

This wheel is suited for both production and maintenance grinding environments where a medium-grit aluminum oxide wheel is called for. Typical applications include flat surface grinding on tool steels, soft and hard carbon steels, 400 series stainless steel, aluminum, cast iron, ductile iron, and gray iron. It is designed for use on surface grinders, cylindrical grinders, and CNC cutting tool machines. The porous, vitrified bond structure allows for effective coolant flow and chip clearance, making it a practical choice for shops running continuous grinding cycles.

Key Features

• Aluminum oxide abrasive with vitrified bond for consistent cutting and long wheel life
• 80 grit, I hardness (medium grade) — suitable for moderate stock removal with good surface finish
• Type 1 straight wheel profile with no recess, compatible with standard surface grinder arbors
• 3600 RPM maximum operating speed
• Porous structure aids coolant penetration and chip evacuation during extended cuts
• Series 32A designation — formulated for use on steels, stainless, aluminum, and cast iron

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Suitable for grinding 400 series stainless steel, hard and soft carbon steels, tool steels, aluminum, cast iron, ductile iron, and gray iron.

Installation Notes

Mounting and dressing of grinding wheels should be performed by a qualified machinist or grinding equipment operator following ANSI B11.9 safety standards. Always inspect the wheel for cracks or chips before mounting — perform a ring test by tapping the wheel lightly and listening for a clear tone. Power down and lock out the grinder before changing wheels, and confirm the machine spindle speed does not exceed the wheel maximum RPM rating. A proper wheel blotter and flanges of matching diameter must be used to ensure safe clamping.