Norton 66243529850 Internal Grinding Wheel 80 Grit

Product Description

The NORTON 66243529850 is an aluminum oxide Type 1 internal grinding wheel designed for precision bore and internal diameter grinding applications. Built with a vitrified bond and medium grade K hardness, this wheel delivers consistent material removal and surface finish on ferrous metals and hard materials. It measures 4 inches in diameter, 1/2 inch thick, with a 3/4 inch arbor hole, and carries a maximum operating speed of 8,120 RPM. The vitrified bond provides rigidity and good dimensional accuracy, making it well suited to production and maintenance grinding environments. Licensed machinists and tool-and-die professionals are the primary installers.

This wheel is configured for internal grinding operations on surface grinders, cylindrical grinders, and dedicated internal grinding machines. The 80 grit, medium grade specification makes it appropriate for stock removal passes where a moderate surface finish is acceptable. The no-recess profile provides a flat, uniform wheel face. It is commonly used in job shops, manufacturing plants, and maintenance facilities where bore sizing, bearing seat grinding, or ID finishing is required on steel, cast iron, and similar hard ferrous workpieces.

Key Features

• Aluminum oxide abrasive for reliable performance on ferrous metals and hard materials
• 80 grit medium grade for efficient stock removal with acceptable surface finish
• Vitrified bond provides rigidity and consistent cutting action throughout wheel life
• K hardness rating suits a wide range of internal grinding applications
• No-recess Type 1 profile for straightforward mounting and full-face contact
• Rated to 8,120 RPM maximum operating speed

Compatibility

Designed as an OEM-style replacement or direct-use internal grinding wheel for machines accepting a Type 1 wheel with a 4 inch diameter, 3/4 inch arbor hole, and 1/2 inch thickness at up to 8,120 RPM.

Installation Notes

Installation should be performed by a qualified machinist or grinding machine operator in accordance with ANSI B11.9 grinding machine safety standards. Always power down and lock out the grinding machine before mounting or removing a wheel. Inspect the wheel for cracks or chips before mounting, and perform a ring test per ANSI B7.1 guidelines. Never exceed the maximum operating speed of 8,120 RPM marked on the wheel.