Norton 66253043450 Surface Grinding Wheel 8in 120 Grit

Product Description

The NORTON 66253043450 is a Type 1 surface grinding wheel engineered for precision material removal on soft carbon steels, tool steels, and super alloys. Built with aluminum oxide abrasive and a vitrified bond, this wheel delivers consistent stock removal and a fine finish at a maximum operating speed of 3600 RPM. At 8 inches in diameter and 1/4 inch thick with a 1-1/4 inch arbor hole, it fits standard surface grinder and cylindrical grinder spindles. The K hardness code indicates a medium-hard grade, making it well-suited for applications where the workpiece material is softer and the wheel needs to release abrasive grains at a controlled rate to prevent glazing.

This wheel is designed for use on surface grinders, cylindrical grinders, and CNC cutting tool machines in tool room, maintenance, and production grinding environments. It performs reliably when grinding soft carbon steels, tool steels, and super alloys where a fine surface finish is the primary objective. The 38A series aluminum oxide grain is semi-friable, meaning it fractures under load to continuously expose fresh cutting edges, reducing heat buildup and extending wheel life on harder workpiece materials.

Key Features

• Type 1 straight wheel profile with no recess for direct mounting on compatible spindle flanges
• 120 grit aluminum oxide abrasive delivers fine stock removal and smooth surface finish
• Vitrified bond provides rigidity and porosity control for consistent grinding performance
• K hardness (medium) grade balances wheel life against self-dressing action on softer workpiece materials
• Semi-friable 38A grain fractures under cutting load to expose fresh abrasive and reduce heat
• Rated to 3600 RPM maximum for safe operation on standard surface and cylindrical grinder spindles

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Suitable for grinding soft carbon steels, tool steels, and super alloys. Fits spindles requiring an 8 inch diameter, 1/4 inch thick, Type 1 wheel with a 1-1/4 inch arbor hole.

Installation Notes

Grinding wheel mounting and dressing should be performed by a qualified machinist or grinding machine operator following ANSI B11.9 and OSHA 29 CFR 1910.215 standards. Always perform a ring test before mounting to check for cracks, and never exceed the 3600 RPM maximum speed rating stamped on the wheel. Ensure blotter pads are used between the wheel and flanges, and that flanges are clean, flat, and properly sized before tightening. Dress the wheel with an appropriate diamond dresser before first use to true the face and expose fresh abrasive grain.