Norton 66252939680 Surface Grinding Wheel 7in 120 Grit

Product Description

The NORTON 66252939680 is a Type 1 surface grinding wheel designed for precision stock removal and surface finishing on a wide range of ferrous and non-ferrous metals. Built with aluminum oxide abrasive and a vitrified bond, it delivers consistent cut rate and controlled wear in dry or wet grinding applications. The wheel measures 7 inches in diameter, 1/4 inches thick, with a 1-1/4 inches arbor hole. At 120 grit with an I hardness code and fine grade classification, it suits finish grinding work where surface finish quality matters. Rated to 3600 RPM maximum operating speed. Wheel weight is approximately 0.79 pounds.

This grinding wheel is suited for use on surface grinders, cylindrical grinders, and CNC cutting tool machines in both job shop and production environments. It performs across a broad material range including 400 series stainless steel, hard and soft carbon steels, tool steels, aluminum, cast iron, ductile iron, and gray iron. The 32A series designation reflects a standard aluminum oxide grain structure commonly specified for toolroom and surface grinding operations requiring a fine finish.

Key Features

• Aluminum oxide abrasive grain for reliable cutting action on ferrous and non-ferrous metals
• Vitrified bond construction for rigidity, porosity, and consistent wheel form retention
• 120 grit fine grade for finish-quality surface grinding passes
• I hardness code indicates medium hardness for balanced wheel life and cut rate
• Porous structure supports coolant flow and chip clearance during grinding
• Type 1 flat wheel profile with no recess, no taper, and a 1-1/4 inches straight arbor hole

Compatibility

Compatible with surface grinders, cylindrical grinders, and CNC cutting tool machines accepting a 7 inches diameter, 1-1/4 inches arbor hole Type 1 grinding wheel. Suitable for grinding 400 series stainless steel, hard carbon steels, soft carbon steels, tool steels, aluminum, cast iron, ductile iron, and gray iron.

Installation Notes

Grinding wheel installation and dressing should be performed by a qualified operator or grinding machine technician following the machine manufacturer's spindle speed rating and ANSI B11.9 safe operating procedures. Always verify that the machine spindle speed does not exceed the 3600 RPM maximum rated speed marked on the wheel before mounting. Inspect the wheel for cracks or chips using the ring test before installation, and never force a wheel onto a spindle that requires excessive effort. Power down and lock out the grinder before changing wheels.