Norton 66253043891 Surface Grinding Wheel 8in 46 Grit

Product Description

The NORTON 66253043891 is a Type 1 surface grinding wheel designed for precision stock removal on surface grinders, cylindrical grinders, and CNC cutting tool machines. It measures 8 inches in diameter, 1/2 inch thick, with a 1-1/4 inch arbor hole. The abrasive is white aluminum oxide (38A series), bonded with a vitrified bond for rigidity and free-cutting action. At 46 grit with H hardness (coarse, soft-to-medium grade), it is well suited for aggressive material removal while maintaining consistent surface finish. Rated to 3,105 RPM maximum. The semi-friable grain self-sharpens under load, extending wheel life between dressings.

This wheel is intended for grinding soft carbon steels, tool steels, and super alloys in production and toolroom environments. It is a porous, non-tapered, no-recess wheel, making it a straightforward drop-in for standard Type 1 flanged arbor mounting on horizontal-spindle surface grinders. The 38A46-HVBEP specification places it in a well-established Norton series used by tool and die shops, job shops, and maintenance grinding operations where consistent cut rate and wheel life are priorities.

Key Features

• White aluminum oxide abrasive (38A series) for free-cutting performance on ferrous metals
• Vitrified bond provides rigidity and coolant compatibility
• 46 grit coarse grade for fast stock removal
• H hardness (soft) rating reduces glazing on softer workpiece materials
• Porous structure aids coolant flow and chip clearance
• Type 1 flat wheel geometry fits standard horizontal-spindle surface and cylindrical grinders

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines requiring a Type 1 wheel with a 1-1/4 inch arbor hole. Suitable for grinding soft carbon steels, tool steels, and super alloys per Norton 38A series specifications.

Installation Notes

Grinding wheel installation must be performed by a qualified machine operator or toolroom technician following ANSI B11.9 and wheel manufacturer safety guidelines. Always ring-test the wheel for cracks before mounting and never exceed the rated 3,105 RPM maximum speed. Shut down and lock out the grinder before changing wheels, and use proper flanges matched to the wheel diameter and arbor size. Run the wheel under guard for at least one minute at operating speed before presenting it to the workpiece.