Norton 66253313990 Surface Grinding Wheel 14in Type 1

Product Description

The NORTON 66253313990 is a Type 1 surface grinding wheel built for aggressive material removal on hard metals. At 14 inches in diameter, 1 inch thick, with a 5-inch arbor hole, this wheel uses a ceramic abrasive grain bonded in a vitrified matrix. The 46-grit coarse grade and H hardness code make it well-suited for high stock-removal applications where surface finish is secondary to cut rate. The semi-friable ceramic grain self-sharpens under load, reducing heat buildup and wheel glazing during extended grinding cycles. Rated to 2320 RPM, this wheel weighs 12 pounds and carries a blue wheel color for grade identification.

This grinding wheel is designed for use on CNC cutting tool machines, cylindrical grinders, and surface grinders in production and toolroom environments. It is specified for demanding materials including 400 Series stainless steel, hard carbon steels, tool steels, titanium, super alloys, cast iron, ductile iron, and gray iron. The porous, vitrified structure promotes coolant flow and chip clearance, making it a practical choice for wet or dry precision grinding operations where wheel breakdown and thermal damage to the workpiece are primary concerns.

Key Features

• Type 1 straight wheel profile with no recess — mounts directly to standard surface and cylindrical grinder spindles
• Ceramic abrasive grain (semi-friable) self-sharpens under load, extending wheel life on hard and abrasion-resistant metals
• Vitrified bond provides structural rigidity and open pore structure for coolant penetration and swarf evacuation
• 46 grit coarse grade delivers high stock removal rates on tool steels, titanium, and super alloys
• H hardness (soft grade) prevents wheel loading on hard workpiece materials by releasing dull grains efficiently
• 5SG series specification — engineered for difficult-to-grind aerospace and toolroom materials

Compatibility

Compatible with CNC cutting tool machines, cylindrical grinders, and surface grinders. Specified material applications include 400 Series stainless steel, hard carbon steels, tool steels, titanium, super alloys, cast iron, ductile iron, and gray iron. Fits spindles accepting a 5-inch arbor hole on 14-inch diameter Type 1 wheels.

Installation Notes

Grinding wheel mounting and dressing should be performed by a qualified machine operator or tool and die technician following ANSI B11.9 and OSHA 29 CFR 1910.215 standards for abrasive wheel machinery. Before mounting, inspect the wheel for cracks using the ring test — do not mount any wheel that produces a dull thud rather than a clear ring. Ensure the machine spindle speed does not exceed the 2320 RPM rating marked on the wheel. Always dress the wheel with an appropriate dressing tool before first use and after any period of storage to restore concentricity and true running.