Norton 66243528825 Internal Grinding Wheel 60 Grit Type 1

Product Description

The NORTON 66243528825 is a Type 1 internal grinding wheel designed for precision bore and internal diameter grinding applications. Built with aluminum oxide abrasive and a vitrified bond, it delivers consistent stock removal and a controlled cut on ferrous metals and tool steels. The wheel measures 3 inches in diameter, 1/2 inch thick, with a 3/8-inch arbor hole, and is rated to a maximum of 10,825 RPM. At medium grade with K hardness, it suits general-purpose internal grinding where surface finish and dimensional accuracy matter. Weighing 0.7 pounds, it is a direct mount wheel with no recess. Machinists, tool grinders, and industrial maintenance professionals are the primary installers.

This wheel is suited for internal grinding operations on cylindrical bores, die cavities, and similar features in both production and job-shop environments. The aluminum oxide abrasive performs reliably on carbon steel, alloy steel, and hardened tool steel workpieces. The vitrified bond provides rigidity and coolant compatibility, making it appropriate for wet or dry grinding setups on standard internal grinding machines. Its compact 3-inch diameter fits tooling configurations common in bench and pedestal internal grinding spindles.

Key Features

• Aluminum oxide abrasive for consistent cut on ferrous and tool steel workpieces
• Vitrified bond construction for rigidity and coolant resistance
• Medium grade, K hardness rating for controlled stock removal and finish
• Rated to 10,825 RPM maximum operating speed
• Type 1 straight wheel profile with no recess for straightforward mounting
• Compact 3 inches diameter by 1/2 inch thick form factor for internal grinding spindles

Compatibility

Designed as an OEM-style replacement or direct-use Type 1 internal grinding wheel for standard internal grinding machines accepting a 3/8-inch arbor hole and a 3-inch diameter wheel.

Installation Notes

Installation should be performed by a qualified machinist or grinding machine operator following ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels. Always power down and lock out the grinding machine before mounting or removing the wheel. Inspect the wheel for cracks or chips before installation and perform a ring test per ANSI guidelines. Never exceed the rated maximum RPM of 10,825, and ensure the machine spindle speed is verified before operation.