Norton 66243529954 Internal Grinding Wheel 100 Grit

Product Description

The NORTON 66243529954 is a Type 1 internal grinding wheel designed for precision bore and internal diameter grinding operations. Built with aluminum oxide abrasive in a vitrified bond matrix, this wheel delivers consistent stock removal and controlled surface finish on ferrous metals and similar workpiece materials. It measures 4 inches in diameter with a 1/2-inch hole and 1/2-inch thickness, and carries a maximum operating speed of 8,120 RPM. The 100-grit, fine-grade specification suits finishing passes where tight tolerances and smooth surface profiles are the priority. Rated at medium hardness (K) with a semi-friable abrasive structure, it self-dresses at a controlled rate to maintain cut consistency throughout the wheel's service life.

This wheel is intended for internal grinding applications on cylindrical or bore surfaces, typically in a tool-and-die, machining, or precision grinding shop environment. It is suited for surface finishing work on hardened steel, cast iron, and similar materials where a fine grit is required to achieve close dimensional control. The no-recess, flat-face Type 1 profile fits standard internal grinding arbors and spindle configurations used in ID grinding machines and toolroom grinders.

Key Features

• 100-grit aluminum oxide abrasive for fine-grade material removal and surface finishing
• Vitrified bond construction provides rigidity, porosity, and consistent wheel performance
• Semi-friable abrasive structure promotes controlled self-dressing during operation
• Medium hardness (K rating) balances wheel life with cut efficiency
• Type 1 flat profile with no recess fits standard internal grinding spindle setups
• Rated to 8,120 RPM maximum operating speed

Compatibility

Designed as an OEM-style replacement or direct-use internal grinding wheel for standard ID grinding machines and toolroom grinders accepting a Type 1 wheel with a 4-inch diameter, 1/2-inch hole, and 1/2-inch thickness.

Installation Notes

Internal grinding wheels must be mounted and operated by qualified grinding machine operators or machinists familiar with ANSI B11.9 and OSHA 1910.215 abrasive wheel standards. Before mounting, inspect the wheel for cracks or chips and perform a ring test. Always confirm the machine spindle speed does not exceed the 8,120 RPM maximum marked on the wheel. Flanges, blotters, and arbor hardware must be properly sized and torqued according to the machine manufacturer's specifications before powering the spindle.