Norton 66252939219 Surface Grinding Wheel 80 Grit 7 in

Product Description

The NORTON 66252939219 is a Type 1 surface grinding wheel engineered for precision stock removal on soft carbon steels, tool steels, and super alloys. The wheel measures 7 inches in diameter and 1/8 inches thick with a 1-1/4 inches arbor hole. It is constructed from aluminum oxide abrasive bonded in a vitrified matrix, producing a white, non-porous wheel rated at medium grade with an I hardness code. Maximum operating speed is 3,275 RPM. The 38A series designation identifies it as a semi-friable aluminum oxide formulation suited to controlled, consistent cutting action on ferrous and high-alloy workpieces. Licensed machinists, tool grinders, and surface grinding specialists are the primary installers and operators.

This wheel is intended for surface grinding, cylindrical grinding, and CNC cutting tool machine applications. Its 80 grit rating positions it in the medium-coarse range, making it effective for moderate material removal while maintaining reasonable surface finish on soft carbon steels, tool steels, and super alloys. The 7-inch diameter and 1/8-inch thickness make it a common format for surface grinder spindles in both job-shop and production-floor environments. The vitrified bond provides rigidity and allows the wheel to break down predictably, exposing fresh abrasive during the cut.

Key Features

• Aluminum oxide abrasive in vitrified bond for consistent cut and controlled breakdown
• 80 grit, medium grade, I hardness code suited to moderate stock removal on ferrous alloys
• Semi-friable 38A grain formulation extends wheel life on soft carbon and tool steel applications
• Non-porous, non-tapered Type 1 flat wheel geometry with no recess
• White wheel color aids visual wear monitoring during dressing cycles
• Rated to 3,275 RPM maximum operating speed

Compatibility

Designed for use with surface grinders, cylindrical grinders, and CNC cutting tool machines. Material applications include soft carbon steels, tool steels, and super alloys. Fits spindles accepting a 1-1/4 inches arbor hole with a 7-inch wheel diameter.

Installation Notes

Grinding wheel mounting and operation should be performed by qualified machinists or tool room technicians familiar with ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels. Always inspect the wheel for cracks or chips before mounting and perform a ring test. Never exceed the 3,275 RPM maximum operating speed marked on the wheel or its blotter. Ensure the machine spindle is fully stopped before changing or dressing the wheel, and use proper flanges and blotters as specified for Type 1 wheel mounting.