Norton 66252939808 Surface Grinding Wheel 80 Grit 7in

Product Description

The NORTON 66252939808 is a Type 1 straight surface grinding wheel designed for precision stock removal and finishing on a range of metallic workpieces. Built around white aluminum oxide abrasive in a vitrified bond matrix, this wheel delivers consistent cut rates and predictable wheel breakdown during use. It measures 7 inches in diameter, 1/4 inch thick, with a 1-1/4 inch arbor hole, and is rated to a maximum of 3600 RPM. The I hardness code and medium grade designation make it well-suited for controlled material removal where wheel integrity and surface finish consistency matter. Installed by machinists and tool grinders in production and maintenance environments.

This wheel is intended for use on surface grinders, cylindrical grinders, and CNC cutting tool machines. It performs well on soft carbon steels, tool steels, and super alloys where a semi-friable, medium-grade abrasive is appropriate. The white aluminum oxide composition helps minimize heat buildup during grinding, which is important when working tool steels and high-performance alloys that are sensitive to thermal damage. It is sized and bored for standard surface grinder spindle setups common in job shops and production machine rooms.

Key Features

• White aluminum oxide abrasive, semi-friable for consistent self-dressing behavior
• Vitrified bond construction for rigidity and dimensional stability during grinding
• I hardness code with medium grade for balanced stock removal and wheel life
• Non-porous, non-tapered Type 1 straight wheel profile with no recess
• 3600 RPM maximum speed rating
• Specification designation 38A80-IVBE for direct cross-reference and ordering

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. The 1-1/4 inch arbor hole fits standard spindle configurations on equipment accommodating 7-inch diameter Type 1 wheels.

Installation Notes

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 guarding requirements. Always inspect the wheel for cracks or chips using a ring test before mounting, and never exceed the rated maximum RPM. Power down and lock out the machine before changing wheels. Use proper flanges and blotters sized for the wheel diameter and confirm guard clearances before starting the spindle.