Norton 66252939662 Surface Grinding Wheel 80 Grit 7in

Product Description

The NORTON 66252939662 is a Type 1 straight surface grinding wheel engineered for precision stock removal on ferrous and non-ferrous metals. It features an aluminum oxide abrasive grain bonded in a vitrified bond matrix, producing consistent cutting action and dimensional stability across extended runs. At 80 grit with a K hardness code (medium grade), the wheel delivers a balance of material removal rate and surface finish quality suited to production and maintenance grinding. The 7 inch diameter and 1/4 inch face width mount on surface grinders, cylindrical grinders, and CNC cutting tool machines via a 1-1/4 inch arbor hole. Maximum operating speed is 3600 RPM. Licensed machinists, tool-and-die technicians, and skilled tradespeople performing precision grinding work are the primary installers and operators.

This wheel is rated for use on 400 series stainless steel, hard and soft carbon steels, tool steels, aluminum, cast iron, ductile iron, and gray iron. It is well suited to surface grinder setups in job shops, maintenance departments, and manufacturing environments where consistent wheel geometry and reliable bond integrity are required. The vitrified bond structure maintains porosity during cuts, allowing coolant penetration and chip clearance that reduces heat buildup at the workpiece surface. The porous, gray-body construction is part of NORTON Series 32A Type 1 specification 32A80-KVBE.

Key Features

• 80 grit aluminum oxide abrasive for medium material removal on a wide range of metals
• Vitrified bond provides rigidity, porosity, and consistent wheel breakdown for repeatable finishes
• K hardness code (medium grade) balances wheel life against cut rate on steels and cast iron
• Type 1 straight-wheel profile fits standard surface grinder and cylindrical grinder spindle setups
• 3600 RPM maximum operating speed rating for safe use on rated machinery
• Porous structure aids coolant flow and chip evacuation during wet or dry grinding

Compatibility

Rated for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Compatible material applications include 400 series stainless steel, hard carbon steels, soft carbon steels, tool steels, aluminum, cast iron, ductile iron, and gray iron. Arbor hole size is 1-1/4 inches; verify spindle diameter and guard clearance before mounting.

Installation Notes

Grinding wheel mounting and dressing must be performed by qualified personnel following ANSI B11.9 and applicable shop safety standards. Always inspect the wheel for cracks or chips before mounting and perform a ring test as specified by the wheel manufacturer. Power down and lock out the grinder before changing wheels, confirm the machine RPM rating meets or exceeds the wheel maximum RPM, and install proper flange hardware with correct blotter paper. Never exceed the 3600 RPM maximum speed rating stamped on the wheel.